SIST EN 60864-2:1999

SLOVENSKI STANDARD
SIST EN 60864-2:1999
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
SIST EN 60864-2:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60864-2:1999

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SIST EN 60864-2:1999

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SIST EN 60864-2:1999

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SIST EN 60864-2:1999

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SIST EN 60864-2:1999

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SIST EN 60864-2:1999
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
 IEC 1997 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni utilisée No part of this publication may be reproduced or utilized in
sous quelque forme que ce soit et par aucun procédé, électronique any form or by any means, electronic or mechanical, including
ou mécanique, y compris la photocopie et les microfilms, sans photocopying and microfilm, without permission in writing from
l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE W
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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SIST EN 60864-2:1999
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

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SIST EN 60864-2:1999
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.

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SIST EN 60864-2:1999
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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.

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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.

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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.

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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.

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SIST EN 60864-2:1999
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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.

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SIST EN 60864-2:1999
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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;

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SIST EN 60864-2:1999
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.

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SIST EN 60864-2:1999
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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

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An example for a typical connection of two bus modules is shown in figure 4.
Module A Module B
ΔU
ΔU
3
3
8
9
Ω 100 Ω
100
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.

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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.

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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
32
representation of numerical data with "binary integer double word" (0 to 2 – 1 unsigned or 0 to
31
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) w
...