SIST EN 60864-2:1999

SLOVENSKI STANDARD
01-januar-1999
Standardization of interconnections between broadcasting transmitters or
transmitter systems and supervisory equipment - Part 2: Interface standards for
systems using data interconnections and television broadcasting specification
sheets (IEC 60864-2:1997)
Standardization of interconnections between broadcasting transmitters or transmitter
systems and supervisory equipment -- Part 2: Interface standards for systems using data
bus type interconnections
Normung der Zusammenschaltung von Rundfunksendern oder Sendersystemen mit
Fernwirkeinrichtungen -- Teil 2: Schnittstellen für Anlagen mit Datenbus-Verbindungen
Normalisation des interconnexions entre les émetteurs ou les systèmes d'émetteurs de
radiodiffusion et les systèmes de télésurveillance -- Partie 2: Normes d'interface pour les
systèmes à interconnexions canalisées
Ta slovenski standard je istoveten z: EN 60864-2:1997
ICS:
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME
CEI
INTERNATIONALE
IEC
60864-2
INTERNATIONAL
Première édition
STANDARD
First edition
1997-06
Normalisation des interconnexions entre
les émetteurs ou les systèmes d'émetteurs de
radiodiffusion et les systèmes de télésurveillance –
Partie 2:
Normes d'interface pour les systèmes à
interconnexions canalisées
Standardization of interconnections between
broadcasting transmitters or transmitter systems
and supervisory equipment –
Part 2:
Interface standards for systems using
data bus type interconnections
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60864-2 © IEC:1997 – 3 –
CONTENTS
Page
FOREWORD . 5
INTRODUCTION. 7
Clause
1 Scope . 9
2 Normative references. 9
3 General aspects . 9
3.1 Definitions . 9
3.2 General philosophy . 17
3.3 Interfaces . 19
3.4 Transmitter systems. 19
4 Requirements for data bus interconnections. 21
5 Basic set of commands and indications. 27
5.1 Introduction . 27
5.2 Single transmitter facilities . 29
5.3 Passive reserve system facilities . 35
5.4 Dual drive transmitter facilities (DD Tx) . 41
5.5 Active reserve system facilities . 47
5.6 (N + 1) reserve system facilities. 53
5.7 Multiplex reserve system facilities. 59
5.8 Auxiliary features. 63
6 General system requirements . 65
6.1 Introduction . 65
6.2 Standard requirements for all systems . 65
Annexes
A Simplified diagrams of commonly used transmitter system . 67
B English/French glossary of terms used in this standard. 75
C Bibliography. 79

60864-2 © IEC:1997 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
STANDARDIZATION OF INTERCONNECTIONS BETWEEN
BROADCASTING TRANSMITTERS OR TRANSMITTER SYSTEMS
AND SUPERVISORY EQUIPMENT –
Part 2: Interface standards for systems using
data bus type interconnections
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60864-2 has been prepared by technical committee 103:
Transmitting equipment for radiocommunication.
The text of this standard is based on the following documents:
FDIS Report on voting
103/3/FDIS 103/6/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
IEC 60864 consists of the following parts, under the general title Standardization of
interconnections between broadcasting transmitters or transmitter systems and supervisory
equipment:
– Part 1: Interface standards for systems using dedicated interconnections;
– Part 2: Interface standards for systems using data bus type interconnections.
Annexes A, B and C are for information only.

60864-2 © IEC:1997 – 7 –
INTRODUCTION
The majority of broadcasting transmitting stations are designed and constructed to operate
unattended, that is without personnel being present in the same room as the transmitter.
Normally, supervisory equipment is installed which continuously monitors and sometimes
controls the operation of the transmitters. The supervisory equipment may range from a simple
unit which merely extends indications and controls into an adjacent room, to a highly
sophisticated system enabling a large number of transmitters to be controlled from a common
point.
The majority of existing transmitters employ wired interconnections; however, the advent of
microprocessors and software techniques will require different interconnection methods, for
example, by means of optical fibres.
It therefore seems appropriate to divide IEC 60864 into two parts, part 1 dealing with dedicated
interconnections and part 2 dealing with data bus type interconnections.

60864-2 © IEC:1997 – 9 –
STANDARDIZATION OF INTERCONNECTIONS BETWEEN
BROADCASTING TRANSMITTERS OR TRANSMITTER SYSTEMS
AND SUPERVISORY EQUIPMENT –
Part 2: Interface standards for systems using
data bus type interconnections
1 Scope
This part of IEC 60864 is applicable to all classes of transmitters for sound and television
broadcasting. This standard may not, however, be appropriate for low power equipment, for
simple transmitting systems which consist of a small number of controlled equipment items and
for certain special purpose transmitters.
Any facilities and interconnections not directly associated with the transmitters, for example
intruder alarms, mast lighting, etc., are excluded from this standard.
This part of IEC 60864 deals with the interface between a transmitter (or system of
transmitters) and the supervisory equipment which is intended to remotely monitor and/or
control the transmitter(s). It details the interconnections and facilities to be provided with a view
to achieving compatibility between different types and makes of transmitters and supervisory
equipment.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 60864. At the time of publication, the editions indicated
were valid. All normative documents are subject to revision, and parties to agreements based
on this part of IEC 60864 are encouraged to investigate the possibility of applying the most
recent editions of the normative documents indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC 60559: 1989, Binary floating-point arithmetic for microprocessor systems
IEC 60625-2: 1993, Programmable measuring instruments – Interface system (byte serial, bit
parallel) – Part 2: Codes, formats, protocols and common commands
ISO/IEC 8482: 1993, Information technology – Telecommunications and information exchange
between systems – Twisted pair multipoint interconnections
IEEE 1118: 1990, Microcontroller-system, Serial control bus
3 General aspects
3.1 Definitions
For the purpose of this part of IEC 60864, the following definitions apply.
3.1.1 (N + 1) dedicated reserve system: (N + 1) reserve system where the same transmitter
is always dedicated as the reserve.

60864-2 © IEC:1997 – 11 –
3.1.2 (N + 1) reserve system: System of transmitters in which only one reserve is provided
for N (N > 1) transmitters in operation.
See figure A.5.
3.1.3 active reserve: System of transmitters in which the reserve is in continuous use and
contributes to the output power, for example, parallel operation.
See figure A.3.
3.1.4 alarm: Indication of an abnormal status.
3.1.5 automatic: Term used to describe a system which acts in a predetermined way, without
the external intervention of an operator.
See figure 1.
3.1.6 automatic changeover: Changeover action, which occurs in a preselected way, without
the external intervention of an operator.
3.1.7 basic transmitter: Individual transmitters in a system consisting of more than one
transmitter.
3.1.8 changeover: Transfer from one signal path or item of equipment to another, normally a
spare or reserve, provided as part of a transmitter system.
3.1.9 command: Action by means of which any part of a transmitter system is made to
change its status.
3.1.10 command circuit: Circuit in a supervisory system, by means of which each command
is sent to the transmitter.
3.1.11 control system: System used to operate a transmitter, transmitter system and/or the
associated equipment by means of one or more commands.
See figure 1.
3.1.12 drive (excitation) (exciter): Low level radio frequency part of a transmitter or
transmitter system.
The drive may be either
– unmodulated, for example, a simple crystal oscillator (sometimes referred to as
excitation), or
– modulated, sometimes followed by amplifiers to form a "drive transmitter".
See figure A.6.
3.1.13 fault (failure) (fail): Abnormal condition of the equipment which usually results in the
generation of an alarm.
3.1.14 indication: Information concerning the status, or quality, relating to an item of
equipment or system.
60864-2 © IEC:1997 – 13 –
Quality indications may be either
– objective, for example, metering in digital or analogue form, insertion test signal (ITS)
measurements, or
– subjective, for example, assessment of picture or sound quality on a picture monitor or
loudspeaker.
3.1.15 indication circuit: Circuit in a supervisory system, by means of which each indication
is sent from the transmitter.
See figure 1.
3.1.16 inhibit: Temporary state into which the transmitter is switched due to an abnormal
condition (e.g. flashover) for a short period of time. It resumes normal operation automatically
after a certain time has elapsed.
3.1.17 interface: Boundary between one part of an item of equipment or system and another.
3.1.18 local: Term used to describe commands and indications which are part of the
transmitting equipment or system logic.
See figure 1.
3.1.19 lock-out: Term used to describe the status of an item of equipment or system which
has been switched off or changed over automatically because of a fault or other abnormal
condition and usually requires manual intervention to reset.
3.1.20 logic: Deduction and/or execution of output conditions dependent upon input
conditions.
3.1.21 logic unit unavailable: Message which indicates that automatic switchover is not
possible because of failure in the logic unit itself or because a changeover is at that instant in
the process of being executed.
3.1.22 manual: Term used to describe an action taken by an operator either locally or
remotely.
See figure 1.
3.1.23 manual control: Mode of operation of the system logic which inhibits automatic
changeover.
3.1.24 modulated: Normal operating state of the transmitter which is broadcasting with
modulation.
3.1.25 momentary closure: Short duration contact closure rather than a continuous contact
closure for command.
3.1.26 monitoring system: System used for checking the status and/or performance of a
transmitter or transmitter system and which normally comprises both status and quality
indications.
See figure 1.
60864-2 © IEC:1997 – 15 –
3.1.27 multiplex reserve system: System of television transmitters whose configuration can
be changed in case of a fault to permit either the vision or the sound amplifier to operate as a
common reserve for vision and sound.
See figure A.4.
3.1.28 off: State during which the transmitter is switched off. The control system is still
capable of receiving orders and giving information about the state of the transmitter.
3.1.29 parallel operation: Operation when two or more transmitters are arranged so that
their outputs are in phase and combined. They are sometimes referred to as dual transmitters.
3.1.30 passive reserve: System of two transmitters in which only one supplies the output
power to the aerial and the other is switched into operation in the event of a fault in the first.
See figure A.2.
3.1.31 preferred (preference): Term used to describe a preselected item of equipment,
signal path or system configuration which is wanted for service.
3.1.32 preselected transmitter: Equipment which is selected for service in the absence of
any faults during automatic operation of a transmitting system.
3.1.33 programme transmitter: Transmitter selected to antenna in a passive reserve,
multiplex reserve or (N + 1) system.
3.1.34 ready (available): Term indicating that the equipment may be immediately brought into
service.
3.1.35 remote: Term used to describe a command (or indication) that can be carried out (or
seen) at a point physically removed from the transmitter equipment or system logic.
See figure 1.
3.1.36 reset: Term used to denote restoring to its preselected condition of an item of
equipment or system, usually following an automatic changeover.
3.1.37 select (preselect): Term used to describe the facility to choose an item of equipment,
signal path or system configuration.
3.1.38 standby transmitter: Transmitter not selected to antenna in a passive reserve,
multiplex reserve or (N + 1) system.
3.1.39 start/stop: Command used to bring into operation or to switch off a transmitter,
transmitter system and/or associated equipment.
3.1.40 supervisory equipment: Equipment in a supervisory system which contains the
command and indication devices and interfaces with the system logic or, in the case of a single
transmitter, with the transmitter logic.
See figure 1.
60864-2 © IEC:1997 – 17 –
3.1.41 supervisory system: System comprising a control system and a monitoring system.
See figure 1.
3.1.42 system logic: Part of a supervisory system which interfaces with both transmitter and
supervisory equipment.
See figure 1.
3.1.43 transmitter logic: Integral part of a transmitter performing control and protection
functions and which interfaces with the system logic or, in the case of a single transmitter, with
the supervisory equipment.
See figure 1.
Supervisory system
Local Remote
Automatic Manual Automatic
Manual
Supervisory system
Commands Indications
Adjustment Status Quality
Switching
(analogue) indications
(binary) indications
Control system
Objective Subjective
(metering) sound, vision
Abnormal
Abnormal
Normal Normal
(alarm) (alarm)
Monitoring system
IEC  508/97
Figure 1 – Diagrams showing the relationship between various terms
3.2 General philosophy
In order to achieve standardization, it is necessary to adopt a general philosophy. The main
concepts of this philosophy are the following:
a) a basic (single) transmitter should contain its own logic to enable it to operate in its own
right if no additional or reserve transmitters are required. This standard covers the interface
between the supervisory system and the transmitter logic unit;

60864-2 © IEC:1997 – 19 –
b) where a transmitter system comprises two or more basic transmitters, the control and
operation of that system should be exercised by means of a separate system logic unit. The
interface between the basic transmitters and the system logic unit is not covered by this
standard. However, connections from the system logic unit or from the basic transmitters to
the supervisory system are covered by this standard (as an example see figure 2).
Interface specified as
part of this standard
Transmitter A
Interface not specified as
part of this standard
Changeover
switch or
Su perviso ry
paralleling
equipment
device
Transmitter B
IEC  509/97
Figure 2 – Simplified diagram of arrangement of equipment for two transmitters
in passive or active reserve
3.3 Interfaces
Commands, indications and operational data are sent from and received by the supervisory
equipment, via a bus system connected to dedicated interface terminals or connectors on the
transmitter or system logic unit.
It should be noted that this standard relates to the transmitter and system logic interface
terminals and not to the supervisory equipment, although this shall, of course, be compatible.
It is possible to use a redundant bus structure, multimaster configuration or optical fibre
cabling. However, this is not dealt with in this standard.
3.4 Transmitter systems
A wide variety of transmitter systems may be devised (see annex A).
Transmitter systems in common use are the following:
– single transmitter (in case of television, comprising a vision and sound transmitter
operating together);
– passive reserve system;
– dual drive configuration;
– (N + 1) reserve system;
– multiplex reserve system;
– active reserve system.
60864-2 © IEC:1997 – 21 –
Many minor variations of these systems are possible but the diagrams in annex A indicate the
most important features of each.
The concept of having reserve transmitters is introduced with the intention of increasing the
reliability of programme delivery. For this reason, in this standard, the commands and
indications which relate to equipment changeover are defined in terms of the programmes
which are carried by the equipment, rather than in terms of the equipment itself.
Therefore the equipment carrying the programme at any time is referred to in this standard as
the programme equipment, whereas the equipment which could be selected for use but is not
in use is referred to as the standby equipment.
4 Requirements for data bus interconnections
4.1 Where a serial and/or bus interface is provided, the interface shall conform to the
requirements given in the following subclauses.
Further information may be found in IEEE 1118, also known as bitbus standard.
4.2 The electrical specification of the bus system (physical layer) shall meet the requirements
of ISO/IEC 8482.
4.3 Connectors to the bus
The connection to the bus cable shall be provided by two 9-pin D-subminiature connectors.
One connector on the equipment shall be female and the other male.
Plugs and sockets shall be used for connections to circuit boards and cable terminations.
The connector pin assignments are shown in figure 3.
shield
reserved
reserved
GND
Bus Environment
reserved
cable
* interface
Data
Data
RTS*
RTS
case
RGND
D-SUB
D-SUB
IEC  510/97
NOTE – Data* and Data as well as RTS* and RTS represent the pins for balanced transmission of the signals.
Figure 3 – Connector pin assignments

60864-2 © IEC:1997 – 23 –
An example for a typical connection of two bus modules is shown in figure 4.
Module A Module B
ΔU
ΔU
Ω 100 Ω
R
R
Gnd
G nd 2a Gnd
Gnd 2b
PE
PE
b
a
IEC  511/97
Optional
Figure 4 – Example for a typical connection of two bus modules
4.4 Either of the two bit rates 62,5 kbit/s or 375 kbit/s are allowed (switchover from one bit
rate to the other via hardware measures). An asynchronous mode of operation with NON
RETURN TO ZERO INVERTED code (NRZI) encoded data shall be used.
4.5 The node addresses shall lie in the range of 1 to 250. The node address shall be adjusted
by hardware means.
4.6 The bus message is transmitted embedded in the information field of the SDLC data
frame (Synchronous Data Link Control Protocol, see figure 5).
For the transmission of data on the bus, the following message format shall be used (see
figure 5).
The length byte describes the length of a bus message (permissible values 7 – 255). Therefore
the data field can contain a maximum of 248 bytes. The 7 bytes of the header consist of 2
internal bytes (not transmitted) and 5 bytes as shown in figure 5.

60864-2 © IEC:1997 – 25 –
Bus
SDLC format
Flag Addr. Control FCS Flag
message
Number of bytes
11 1 N 2 1
Control = Field for status
Flag = bit pattern 01111110
exchange between
for synchronization and
master and slave devices
frame delimitation
FCS = Frame check sequence
contains 16 bit cyclic
Addr. = Node address
redundancy check (CRC)
MSB LSB
First bit transmitted
Length
Reserved
MT SE TR
DE
(4 bits)
Node address
Message format
Source task Destination task
Command/response
High address pointer
Data field
Low address pointer
Data
Last bit transmitted
IEC  512/97
MT = Message type (order or reply)
SE = Source extension
DE = Destination extension
TR = Track (send or receive message)
Figure 5 – SDLC frame format and bus message format
4.7 The command/response field (see figure 5) shall be used in order to set access
operations. When it is required to issue a command, this shall be performed by the RAC
(Remote Access and Control) command "download memory" (RAC command no. 09
hexadecimal). When it is required to demand the status of indications, this shall be performed
by the RAC command "upload memory" (RAC command no. 08 hexadecimal).
4.8 Use of the data field
4.8.1 With the RAC commands "upload memory" or "download memory", the first two bytes of
the data field are defined to be the high and low address pointers.
The data shall be packed contiguously in the data field (no gaps between the data bytes). Each
command and indication shall be represented separately. Commands and indications referred
to in clause 5 of this standard shall be placed in the data field ahead of any further information
which is not mentioned in this standard. The memory area for commands shall be separated
from the memory area for indications, but it is recommended that they are contiguous.
In order to be sure that the command sent to the slave module has been initiated, an
acknowledgement byte shall be transferred to the master. No further command shall be sent to
the slave until positive acknowledgement that the command has been initiated has been
received by the master.
The memory location used for the third data byte shall be used for this tell-back information.
Acknowledgement shall be indicated by "FF", non acknowledgement by "FE". The master shall
request the acknowledgement information by applying the "upload memory" command on this
particular memory area. The application running in the slave shall write the acknowledgement
information into the memory location when the received command is understood and initiated.

60864-2 © IEC:1997 – 27 –
4.8.2 Numerical data shall be represented using the "single precision" format according to
IEC 60559 and IEC 60625-2.
The bit format shall be as indicated in figure 6.
The first field (1 bit) is reserved for the sign of the mantissa. The second field (8 bit) is
–127 +127
reserved for the exponent. The value ranges from 2 to 2 and is transmitted with an offset
of + 127 (and hence no sign bit for the exponent is necessary).
The third field (23 bit) contains the fraction of the mantissa. The mantissa ranges from 1,0 to
1,9999999. With this coding structure, the mantissa precision is about 7 decimal places. For
further details of coding and examples, see IEC 60559 and IEC 60625-2.
If in special cases, a higher precision is required, such as for frequency information, a
representation of numerical data with "binary integer double word" (0 to 2 – 1 unsigned or 0 to
2 – 1 with sign) is allowed.
MSB
76 543 210
SE EEE EEE
E F FFF FFF
FF FFF FFF
FF FFF FFF
LSB
s = 0 positive, s = 1 negative
e = E + bias (+ 127)
f = fraction of mantissa
s e–127 IEC  513/97
value v = (– 1) x 2 x 1.f
Figure 6 – Binary floating point code for single precision numbers
4.9 The transmitter manufacturers shall provide a list detailing the following:
– the meaning of all possible bit combinations used in the data field of the message
format;
– the memory address pointers;
– whether the DE field is set or not.
4.10 For measuring data (e.g. from analysis systems) with its associated special commands
and indications, a separate interface shall be provided. It shall be possible to inhibit measuring
commands which have influence on the operational state of the transmitter, if they conflict with
commands sent to the interface described in 4.1 to 4.9.
It is permissible to transmit operational measuring data via the interface described in 4.1 to 4.9.
5 Basic set of commands and indications
5.1 Introduction
Clause 5 deals with commands to logic units and responses from logic units which are
transmitted as messages over the data bus type interface.

60864-2 © IEC:1997 – 29 –
For a detailed description of the dialogue between supervisory system and the logic units,
reference is made to clause 4.
A response associated with a "Set" command shows that the command has been received and
initiated. A response associated with a "Get" command reports the actual status of the
equipment. An alarm is classed as an indication of an abnormal state.
If a logic unit supports a feature, the commands and indications relating to that feature shall
conform to the arrangements defined below. If a logic unit does not support that feature, the
commands and indications appropriate to it need not be supported.
In the following tables, values that are not explicitly designated as "user defined" shall be
reserved for future standardization activities.
5.2 Single transmitter facilities
5.2.1 Third and fourth byte in the data field
Table 1 lists the values of the third and fourth byte in the data field of a message. Note that the
values of the bytes following the fourth byte may contain additional command information. "N"
in the data field means the transmitter number N (.F). For details, see the respective
subclauses below. For the definition of the first two bytes in the data field, see clause 4.
Table 1 – Single transmitter – Values of the third and fourth byte
Command 3rd byte 4th byte
(hexadecimal) (hexadecimal)
Set operation mode 00 0N
Set power 01 0N
Set frequency 02 0N
Set modulation type and coding 03 0N
Set modulation source selection 04 0N
User defined 10-1F 0N
Get operation mode 20 0N
Get power 21 0N
Get frequency 22 0N
Get modulation type and coding 23 0N
Get modulation source selection 24 0N
User defined 30-3F 0N
Get state No 0 40 0N
User defined 50-5F 0N
Get operational data No 0 60 0N
User defined 61-FD 0N
Not acknowledged indication FE 0N
Acknowledged indication FF 0N
Acknowledged indication FF 0N
5.2.2 Contents of subsequent bytes in the data field
5.2.2.1 Set operation mode
This command is used to order the transmitter to adopt a desired state. It uses a five-byte data
field. The third and the fourth byte are defined in table 1. The fifth byte contains the information
given in table 2.
60864-2 © IEC:1997 – 31 –
Table 2 – Set operation mode – Values of the fifth byte
Information Value (hexadecimal)
Off 10
Filaments on 30
Ready 40
Modulated 70
User defined A0-FF
5.2.2.2 Set power
This command is used to order the transmitter to adopt new power levels. It uses a six-byte
data field. The third and the fourth byte are defined in table 1. The subsequent bytes contain
the power levels in watts as single precision floating point numbers.
5.2.2.3 Set frequency
This command is used to order the transmitter to adopt a new frequency. It uses an eight-byte
data field. The third and the fourth byte are defined in table 1. The subsequent bytes contain
the frequency in hertz as a binary integer double word.
5.2.2.4 Set modulation type and coding
This command is used to order the transmitter to select a new modulation type and/or way of
coding. It uses a five-byte data field. The third and the fourth byte are defined in table 1. The
fifth byte contains the information given in table 3.
Table 3 – Set modulation type and coding – Values of the fifth byte
Information Value (hexadecimal)
AM 10
DSB 20
SSB – 6 dB 30
SSB –12 dB 40
FM stereo 50
FM mono 51
TV mono 60
TV dual 61
TV stereo 62
TV sound and data 63
User defined A0-FF
5.2.2.5 Set modulation source selection
This command is used to order the transmitter to select a modulation source line. It uses a
five-byte data field. The third and the fourth byte are defined in table 1. The fifth byte contains
the information given in table 4.
Table 4 – Set modulation source selection – Values of the fifth byte
Information Value (hexadecimal)
Line 1 01
Line 2 02
Line 3 03
User defined 04-FF
60864-2 © IEC:1997 – 33 –
5.2.2.6 Get operation mode
This command is used to get information on the actual state of the transmitter. It uses four
bytes (third and fourth byte defined in table 1). The response to the command produced by the
logic unit consists of a five-byte data field. The third and the fourth byte are defined in table 1.
The fifth byte contains the information given in table 5.
Table 5 – Get operation mode – Values of the fifth byte
Information Value (hexadecimal)
Off 10
Filaments on 30
Ready 40
Modulated 70
Inhibit A0
Fault C0
User defined E0-FF
5.2.2.7 Get power
This command is used to read the current transmitter power levels. It uses four bytes (third and
fourth byte defined in table 1). The response to the command produced by the logic unit
consists of a six-byte data field. The third and the fourth byte are defined in table 1. The
subsequent bytes contain the power levels in watts as single precision floating point numbers.
5.2.2.8 Get frequency
This command is used to read the current transmitter frequency. It uses four bytes (third and
fourth byte defined in table 1). The response to the command produced by the logic unit
consists of an eight-byte data field. The third and the fourth byte are defined in table 1. The
subsequent bytes contain the frequency in hertz as a binary integer double word.
5.2.2.9 Get modulation type and coding
This command is used to get information on the actual modulation type and/or way of coding of
the transmitter. It uses four bytes (third and fourth byte defined in table 1). The response to the
command produced by the logic unit consists of a five-byte data field. The third and the fourth
byte are defined in table 1. The fifth byte contains the information given in table 6.
Table 6 – Get modulation type and coding – Values of the fifth byte
Information Value (hexadecimal)
AM 10
DSB 20
SSB – 6 dB 30
SSB –12 dB 40
FM stereo 50
FM mono 51
TV mono 60
TV dual 61
TV stereo 62
TV sound and data 63
User defined A0-FF
60864-2 © IEC:1997 – 35 –
5.2.2.10 Get modulation source selection
This command is used to get information from the transmitter on the currently selected
modulation source line. It uses four bytes (third and fourth byte defined in table 1). The
response to the command produced by the logic unit consists of a five-byte data field. The third
and the fourth byte are defined in table 1. The fifth byte contains the information given in
table 7.
Table 7 – Get modulation source selection – Values of the fifth byte
Information Value (hexadecimal)
Line 1 01
Line 2 02
Line 3 03
User defined 04-FF
5.2.2.11 Get state No 0
This command is used to get information from the transmitter on its current status. It uses four
bytes (third and fourth byte defined in table 1). The response to the command produced by the
logic unit consists of a five-byte data field. The third and the fourth byte are defined in table 1.
The fifth byte contains the following information.
Tx N bit 0 (LSB): set if transmitter is in alarm state
Tx N bit 1: set if transmitter is in warning state
Tx N bit 2: set if interlock is not in "safe" state
Tx N bit 3: set if there is a failure of transmitter mains supply
Tx N bit 4: set if there is a carrier failure
Tx N bit 5: set if VSWR of transmitter excessive
Tx N bit 6: set if there is a modulation failure on transmitter
Tx N bit 7: set if transmitter in remote mode of operation
cleared if in local mode
5.2.2.12 Get operational data No 0
There is no standard set of operational data which shall be supported mandatorily by all
equipment. The definition that follows shall therefore serve as an example on how to implement
operational data.
This command is used to get information from the transmitter on an analogue value. It uses
four bytes (third and fourth byte defined in table 1). The response to the command produced by
the logic unit consists of an eight-byte data field. The third and the fourth byte are defined in
table 1. The subsequent bytes contain the measured value as a single precision floating point
number or as a binary double word.
5.3 Passive reserve system facilities
5.3.1 Third and fourth byte in the data field
Table 8 lists the values of the third and fourth byte in the data field of a message. Note that the
values of the bytes following the fourth byte may contain additional command information. For
details, see the respective subclauses below. For the definition of the first two bytes in the data
field, see clause 4.
60864-2 © IEC:1997 – 37 –
Table 8 – Passive reserve system – Values of the third and fourth byte
Command 3rd byte 4th byte
(hexadecimal) (hexadecimal)
Logic unit Set operation mode 00 50
Set selected / preselected Tx 10 50
Get operation mode 20 50
Get selected / preselected Tx 30 50
Reset 40 50
Get state No 0 50 50
User defined 60-FD 50
Not acknowledged indication FE 50
Acknowledged indication FF 50
Programme transmitter Set operation mode 00 01
Set power 01 01
Set frequency 02 01
Set modulation type and coding 03 01
Set modulation source selection 04 01
User defined 10-1F 01
Get operation mode 20 01
Get power 21 01
Get frequency 22 01
Get modulation type and coding 23 01
Get modulation source selection 24 01
User defined 30-3F 01
Get state No 0 40 01
User defined 50-5F 01
Get operational data No 0 60 01
User defined 61-FD 01
Not acknowledged indication FE 01
Acknowledged indication FF 01
Standby transmitter Set operation mode 00 11
Set power 01 11
Set frequency 02 11
Set modulation type and coding 03 11
Set modulation source selection 04 11
User defined 10-1F 11
Get operation mode 20 11
Get power 21 11
Get frequency 22 11
Get modulation type and coding 23 11
Get modulation source selection 24 11
User defined 30-3F 11
Get state No 0 40 11
User defined 50-5F 11
Get operational data No 0 60 11
User defined 61-FD 11
Not acknowledged indication FE 11
Acknowledged indication FF 11
5.3.2 Contents of subsequent bytes in the data field
5.3.2.1 Set logic unit operation mode
This command is used to order the logic unit to adopt a desired state. It uses a five-byte data
field. The third and the fourth byte are defined in table 8. The fifth byte contains the information
given in table 9.
60864-2 © IEC:1997 – 39 –
Table 9 – Set logic unit operation mode – Values of the fifth byte
Information Value (hexadecimal)
Manual mode 10
Automatic mode 40
User defined 80-FF
5.3.2.2 Set logic unit selected / preselected transmitter
This command is used to indicate which transmitter shall be preselected in automatic mode or
which transmitter shall be selected in manual mode. It uses a five-byte data field. The third and
the fourth byte are defined in table 8. The fifth byte contains the information given in table 10.
Table 10 – Set logic unit selected / preselected transmitter – Values of the fifth byte
Information Value (hexadecimal)
Tx A selected / preselected 10
Tx B selected / preselected 20
User defined 40-FF
5.3.2.3 Get logic unit operation mode
This command is used to get information on the actual state of the logic unit. It uses four bytes
(third and fourth byte defined in table 8). The response to the command produced by the logic
unit consists of a five-byte data field. The third and the fourth byte are defined in table 8. The
fifth byte contains the information given in table 11.
Table 11 – Get logic unit operation mode – Values of the fifth byte
Information Value (hexadecimal)
Manual mode 10
Automatic mode 40
Logic unit unavailable 70
User defined 80-FF
5.3.2.4 Get logic unit selected / preselected transmitter
This command is used to get information on which transmitter is preselected in automatic
mode or which transmitter is selected in manual mode. It uses four bytes (third and fourth byte
defined in table 8). The response to the command produced by the logic unit consists of a five-
byte data field. The third and the fourth byte are defined in table 8. The fifth byte contains the
information given in table 12.
Table 12 – Get logic unit selected / preselected transmitter – Values of the fifth byte
Information Value (hexadecimal)
Tx A selected / preselected 10
Tx B selected / preselected 20
User defined 40-FF
60864-2 © IEC:1997 – 41 –
5.3.2.5 Reset
This command uses a four-byte data field.
5.3.2.6 Get logic unit state No 0
This command is used to get information from the logic unit on its current status. It uses four
bytes (third and fourth byte defined in table 8). The response to the command produced by the
logic unit consists of a five-byte data field. The third and the fourth byte are defined in table 8.
The fifth byte contains the following information.
Bit 0 (LSB): set if changeover system is in alarm state
Bit 1: set if an automatic changeover (from the preselected condition) has taken
place
Bits 2 to 6: user defined
Bit 7: set if changeover system in remote mode of operation
cleared if in local mode
5.3.2.7 Other commands
For all other commands, the third, fifth and subsequent bytes in the data field follow an
identical pattern to that for the corresponding bytes for the single transmitter case (see 5.2.2).
The fourth byte is defined in table 8.
5.4 Dual drive transmitter facilities (DD Tx)
5.4.1 Third and fourth byte in the data field
Table 13 lists the values of the third and fourth byte in the data field of a message. Note that
the values of the bytes following the fourth byte may contain additional command information.
For details, see the respective subclauses below. For the definition of the first two bytes in the
data field, see clause 4.
60864-2 © IEC:1997 – 43 –
Table 13 – Dual drive transmitter – Values of the third and fourth byte
Command 3rd byte 4th byte
(hexadecimal) (hexadecimal)
Dual drive logic unit Set operation mode 00 60
Set selected / preselected exciter 10 60
Get operation mode 20 60
Get selected / preselected exciter 30 60
Reset 40 60
Get state No 0 50 60
User defined 60-FD 60
Not acknowledged indication FE 60
Acknowledged indicati
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