SIST HD 577 S1:1999

Standardization of interconnections between broadcasting transmitters or transmitter systems and supervisory equipment -- Part 1: Interface standards for systems using dedicated interconnections

Applies to all classes of transmitters for sound and television broadcasting. 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). Details the interconnections and facilities to be provided with a view to achieving compatibility between different types and makes of transmitters and supervisory equipment.

Normung der Zusammenschaltung von Rundfunksendern oder Sendersystemen mit Fernwirkeinrichtungen -- Teil 1: Schnittstellen für Anlagen mit zugeordneten Verbindungen

Normalisation des interconnexions entre les émetteurs ou les systèmes d'émetteurs de radiodiffusion et les systèmes de télésurveillance -- Partie 1: Normes d'interface pour les systèmes à interconnexions câblées

S'applique à toutes les classes d'émetteurs de radiodiffusion sonore et de la télévision. Concerne l'interface entre les émetteurs ou les systèmes d'émetteurs et l'équipement de télésurveillance qui doit contrôler et/ou commander à distance l'émetteur (ou les émetteurs). Spécifie les interconnexions et les dispositifs à prévoir afin de rendre compatibles les différents types et les différentes fabrications d'émetteurs et d'équipements de télésurveillance.

Standardization of interconnections between broadcasting transmitters or transmitter systems and supervisory equipment - Interface (IEC 60864-1:1986 + A1:1987)

General Information

• Status: Published
• Publication Date: 31-Dec-1998
• ICS: 33.060.20 - Receiving and transmitting equipment
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: RZV - Radiocommunication
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-1999
• Due Date: 01-Jan-1999
• Completion Date: 01-Jan-1999
• Ref Project: HD 577 S1:1990 - Standardization of interconnections between broadcasting transmitters or transmitter systems and supervisory equipment - Part 1: Interface standards for systems using dedicated interconnections

Standards Content (Sample)

SLOVENSKI STANDARD
SIST HD 577 S1:1999
01-januar-1999
Standardization of interconnections between broadcasting transmitters or
transmitter systems and supervisory equipment - Interface (IEC 60864-1:1986 +
A1:1987)
Standardization of interconnections between broadcasting transmitters or transmitter
systems and supervisory equipment -- Part 1: Interface standards for systems using
dedicated interconnections
Normung der Zusammenschaltung von Rundfunksendern oder Sendersystemen mit
Fernwirkeinrichtungen -- Teil 1: Schnittstellen für Anlagen mit zugeordneten
Verbindungen
Normalisation des interconnexions entre les émetteurs ou les systèmes d'émetteurs de
radiodiffusion et les systèmes de télésurveillance -- Partie 1: Normes d'interface pour les
systèmes à interconnexions câblées
Ta slovenski standard je istoveten z: HD 577 S1:1990
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
33.200 Daljinsko krmiljenje, daljinske Telecontrol. Telemetering
meritve (telemetrija)
SIST HD 577 S1:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST HD 577 S1:1999

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SIST HD 577 S1:1999

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SIST HD 577 S1:1999

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SIST HD 577 S1:1999
NORME
CEI
INTERNATIONALE
IEC
60864-1
INTERNATIONAL
Première édition
STAN DARD
First edition
1986-01
Normalisation des interconnexions entre les
émetteurs ou les systèmes d'émetteurs de
radiodiffusion et les systèmes de télésurveillance
Première partie:
Normes d'interface pour les systèmes
à interconnexions câblées
Standardization of interconnections between
broadcasting transmitters or transmitter systems
and supervisory equipment
Part 1:
Interface standards for systems
using dedicated interconnections
© IEC 1986 Droits de reproduction réservés —
Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
S
PRICE CODE
International Electrotechnical Commission
IEC
Men ayHapoAHaR 3JleNTpOTexHH4ecKag KOMNCCNA
Pour prix, voir catalogue en vigueur
•
• For price, see current catalogue

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SIST HD 577 S1:1999
864-1 © - 3 -
IEC 1986
CONTENTS
Page
5
FOREWORD
PREFACE 5
INTRODUCTION 7
Clause
7
1. Scope
7
2. Object
SECTION ONE — GENERAL
7
3. Terminology
9
4. General philosophy
9
5. Interfaces
Command and indication circuits 9
6.
7. Transmitter systems 9
STANDARD BINARY INTERFACE TECHNIQUES
SECTION TWO -
11
8. Introduction
Relay techniques 11
9.
13
10. Semiconductor logic techniques
15
11. Opto-isolator techniques (under consideration)
SECTION THREE — BINARY COMMANDS AND INDICATIONS
17
12. Introduction
17
13. Single transmitter facilities
14. Passive reserve system facilities 19
15. Active reserve system facilities 19
21
16. (N + 1) reserve system facilities
23
17. Multiplex reserve system facilities
SECTION FOUR — STANDARD ANALOGUE INTERFACE TECHNIQUES
(Under consideration)
SECTION FIVE — ANALOGUE COMMANDS AND INDICATIONS
(Under consideration)
SECTION SIX — GENERAL SYSTEM REQUIREMENTS
22. Introduction 25
23. Standard requirements for all systems 25
FIGURES 27
APPENDIX A - Glossary and definition of terms in common use 38
43
APPENDIX B - Index of English terms

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864-1 © IEC 1986 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
STANDARDIZATION OF INTERCONNECTIONS BETWEEN
BROADCASTING TRANSMITTERS OR TRANSMITTER SYSTEMS
AND SUPERVISORY EQUIPMENT
Part 1: Interface standards for systems using dedicated interconnections
FOREWORD
1)
The formal decisions or agreements of the I E C on technical matters, prepared by Technical Committees on which all the
National Committees having a special interest therein are represented, express, as nearly as possible, an inte
rnational consensus
of opinion on the subjects dealt with.
2)
They have the form of recommendations for inte rnational use and they are accepted by the National Committees in that
sense.
3) In order to promote inte rn
ational unification, the I E C expresses the wish that all National Committees should adopt the text of
the I E C recommendation for their national rules in so far as national conditions will permit. Any divergence between the I E C
recommendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter.
PREFACE
This standard has been prepared by Sub-Committee 12C: Transmitting Equipment, of IEC Tech-
nical Committee No. 12: Radiocommunications.
The text of this standard is based on the following documents:
Six Months' Rule Reports on Voting
12C(CO)163 12C(CO)168
12C(CO)174
12C(CO)181
12C(CO)175 12C(CO)180
12C(CO)177 12C(CO)182
Further information can be found in the relevant Repo
rts on Voting, indicated in the table
above.

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864-1©IEC1986
STANDARDIZATION OF INTERCONNECTIONS BETWEEN
BROADCASTING TRANSMITTERS OR TRANSMITTER SYSTEMS
AND SUPERVISORY EQUIPMENT
Part 1: Interface standards for systems using dedicated interconnections
INTRODUCTION
The majority of broadcasting transmitting stations are designed and constructed to operate unat-
tended, that is without personnel being present in the same room as the transmitter. Normally, super-
visory 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 indica-
tions and controls into an adjacent room, to a highly sophisticated system enabling a large number of
transmitters to be controlled from a common point.
This standard is concerned with the interface between the transmitters and supervisory equipment.
It comprises two parts:
Part 1: Interface standards for systems using dedicated interconnections.
Part 2: Interface standards for systems using data bus type interconnections (under consider-
ation).
It seems appropriate to divide the standard in this way because, although the majority of existing
transmitters employ wired interconnections, the advent of microprocessors and software techniques will
require different interconnection methods, for example, by means of optical fibres.
1. Scope
This standard is applicable to all classes of transmitters for sound and television broadcasting.
The standard may not, however, be appropriate for low power equipment and ce rtain 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.
2. Object
This standard 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.
SECTION ONE — GENERAL
3. Terminology
To ensure a common understanding of terms used in this standard, a glossary and index have
been included in Appendices A and B. The relationship between some of the most impo rtant terms
is shown in Figure 1, page 27.

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SIST HD 577 S1:1999
864-1 © IEC 1986 9
4. General philosophy
In order to achieve standardization, it is necessary to adopt a general philosophy, the main
concepts of which are as follows:
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.
b) Any transmitter system (an example of which is shown in Figure 2, page 29), should comp ri
se
two or more basic transmitters.
c) Control and operation of a system of transmitters should be exercised by means of separate
system logic.
d) The interfaces of both the basic transmitter and the system logic unit need to be standardized in
order to ensure compatibility and interchangeability of equipment.
5.
Interfaces
The interfaces to be standardized are shown in Figure 2. Commands and indications are sent
from and received by the supervisory equipment, via dedicated pairs of wires 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 must, of course, be compatible.
6. Command and indication circuits
The term `command circuit' is used throughout this standard to denote the (dedicated) circuit
required to send each command to the transmitter. Similarly, the term `indication circuit' is used
to denote the circuit by means of which each indication is sent from the transmitter.
7. Transmitter systems
A wide variety of transmitter systems may be devised using the approach referred to in Clause 4.
Transmitter systems in common use are :
– single transmitter (in the case of television, comprising a vision and sound transmitter operating
together);
– passive reserve system;
– active reserve system;
–
(N + 1) reserve system;
–
multiplex reserve system.
Examples of such systems are shown in Figure 3, page 31. Many minor va riations of these
systems are possible but the diagram indicates the most impo rtant features of each.
Sections Two to Five below are concerned with the facilities to be provided for each system,
distinguishing between binary and analogue techniques. General requirements relating to all
systems are given in Section Six.

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SECTION TWO — STANDARD BINARY INTERFACE TECHNIQUES
8. Introduction
This section deals with the three main techniques in common use in systems employing binary
techniques and dedicated interconnections, viz,
—relays;
—semiconductor logic;
—opto-isolators.
9. Relay techniques
The use of relay techniques is illustrated in Figure 4, page 33. This shows the principle that the
low voltage supply for command circuits is part of the transmitter and similarly, the supply for
indication circuits is part of the system logic unit (or supervisory equipment in the case of a single
transmitter).
The low voltage supply should preferably be connected to the relays via a link external to the
transmitter, as shown in Figure 4. This arrangement facilitates compatibility with different types
of supervisory equipment.
9.1 Commands
Commands are sent to the transmitter by means of contacts located in the supervisory equip-
ment or system logic unit.
The transmitter logic shall be compatible with one or the other of the following two tech-
niques :
1) Continuous closure of the appropriate contact of the supervisory equipment or system logic
unit for the duration of the required state. The opposite state is achieved by opening the contact
and in this case, only a single command circuit is required.
2) Momentary closure of the contact with a duration between 100 ms and 500 ms. In this case, the
opposite command requires an additional command circuit.
Unintentional continuous closure of contacts which are intended for momentary closure shall
not interfere with the normal operation of the transmitters.
9.1.1 Circuit requirements
Command circuit terminals shall be earth-free and arranged so as to allow for either:
—independent pairs, or
—the use of a common return wire.
Command circuit relays shall have a nominal voltage of 24 V and a maximum energizing cur-
rent of 25 mA. It is recommended that the relays should be compatible with semiconductor
logic techniques and opto-isolator techniques in accordance with Clauses 10 and 11.

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864-1 O IEC 1986 – 13 –
9.1.2 Contact requirements
Command circuit contacts shall be floating, i.e. free of all potentials.
The contacts shall be capable of switching at least 25 mA at 24 V d.c.
9.2 Indications
As can be seen in Figure 4, page 33, indications are sent to the supervisory equipment or system
logic unit by means of change-over contacts located in the transmitter.
9.2.1 Contact requirements
Either the normally open or normally closed contacts may be used.
The contacts shall be floating, i.e. free of all potentials, and operate continuously for the duration
of the indicated status.
The contacts shall be capable of switching at least 25 mA at 24 V d.c.
10. Semiconductor logic techniques
The principle of semiconductor logic techniques is illustrated in Figure 5, page 35.
Appropriate precautions shall be taken to prevent misoperation as a result of unwanted voltages
on the interconnections between the transmitter and the supervisory equipment or system logic
unit.
10.1
Commands
Commands are sent to the transmitter by means of semiconductor switching devices or floating
contacts located in the supervisory equipment or system logic unit.
The transmitter logic shall be compatible with one or the other of the following two tech-
niques :
1) Continuous closure of the command circuit by the appropriate switching device in the super-
visory equipment or system logic unit for the duration of the required state. The opposite state
is achieved by opening the circuit and in this case, only a single command circuit is
required.
2)
Momentary closure of the circuit with a duration between 20 ms and 500 ms. In this case, the
opposite command requires an additional command circuit.
Unintentional continuous closure of circuits which are intended for momentary closure shall
not interfere with the normal operation of the transmitters.
10.1.1 Circuit requirements
Command circuits may employ a common return connected to the earthed negative of the
power supply in the transmitter.
The command circuit terminals on the supervisory equipment or system logic unit shall be earth
free.

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IEC 1986
10.1.2 Signal voltage and signal current levels
The two states of the binary d.c. voltage or current shall be within the limits given in
Table I.
10.1.3 Transient protection
Command circuits shall be protected against damage from transients. This may be verified by
discharging a 33 ILF capacitor charged at 250 V across each command circuit.
TABLE I
Terminal voltage Terminal current
Command (V) (mA)
or indication
Min. Nom. Max. Min. Nom. Max.
0 3 6 8 10
Circuit closed -1
Circuit open 18 24 30 0 - 0.6
10.2
Indications
As can be seen from Figure 5, page 35, indications are sent to the supervisory equipment or
system logic unit by means of semiconductor switching devices located in the transmitter.
10.2.1 Circuit requirements
The indication circuit shall operate continuously for the duration of the indicated status.
Indication circuits may employ a common return connected to the earthed negative of the power
supply in the transmitter.
The indication circuit terminals on the supervisory equipment or system logic unit shall be earth
free.
10.2.2 Signal voltage and signal current levels
The two states of the binary d.c. voltage or current shall be within the limits given in
Table I.
10.2.3 Transient protection
Indication circuits shall be protected against damage from transients. This may be verified by
discharging a 33 µF capacitor charged at 250 V across each indication circuit in both states, i.e.
open and closed.
11. Opto-isolator techniques
Under consideration.

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864-1 © IEC 1986 - 17 -
SECTION THREE — BINARY COMMANDS AND INDICATIONS
12. Introduction
This section deals with commands and indications which are in one of two possible states, for
example, normal/abnormal.
In general, indications associated with commands show that commands have been received and
initiated. An "alarm" is classed as an indication of an abnormal state.
Commands and indications are categorized as follows:
Category 1: Facilities normally required for all types of transmitters.
Category 2: Examples of commonly specified facilities not required by all users, sometimes
arising from particular transmitter types or applications.
Examples of such facilities are given in Clauses 13 to 17 below for the systems referred to in
Clause 7.
13. Single transmitter facilities
The facilities listed in Table II are those which shall be provided for a single transmitter, or in the
case of television, a vision and sound transmitter operating simultaneously.
TABLE II
Facilities category 1 Command Indication Notes
x x 1
Start
x x 1
Stop
x 2, 3
R.F. output (present/absent)
Local/remote x
x
Fault 4
Command Indication Notes
Facilities category 2
High power x x
x x
Low power
Select frequency x x 5
x
Preliminary warning 6
x x 7
Ready
Reset x 8
x
VSWR (out of limits) 9
Cooling fault x
x
Mains supply fail
x 3
R.F. output (out of limits)
Modulation (out of limits) x 3
Notes 1. — Separate start and stop commands are required only where momentary (pulse) techniques are employed as
opposed to continuous contact closure.
2. — Sometimes referred to as "carrier fail" or "car rier normal".
3. — For television, separate indications may be required for sound and vision.
4. — Sometimes referred to as "lockout".
5. Normally required for transmitters operating in the HF bind on a number of possible frequencies, each
requiring an individual command and indication.

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SIST HD 577 S1:1999
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864-1 © IEC 1986
6. — A warning that part of the transmitter is abnormal although it is still in se rvice.
ice, for example all filament delays etc., expired. The command
Transmitter immediately available for se rv
7. —
brings the transmitter to this state.
Used to restore normal operation following a "fault".
8. -
VSWR = Voltage Standing Wave Ratio.
9. —
14. Passive reserve system facilities
The facilities listed in Table III shall be provided for a passive reserve transmitter system, an
example of which is shown in Figure 3, page 31. It should be noted that these facilities are
additional to those available from a single transmitter (which may or may not be required).
TABLE III
Indication Notes
Facilities category 1 Command
1
x x
Start
x x 1
Stop
x x 2
Preselect/select transmitter A
x 2
x
Preselect/select transmitter B
x x
Inhibit auto change-over
x x
Select auto change-over
Local/remote x
x 3
Auto change-over
Indication Notes
Facilities category 2 Command
4
x
Reset system
x 5
System fault
Transmitter A in use x
Transmitter B in use x
Separate start and stop commands are required only where momentary (pulse) techniques are employed as
Notes 1. —
opposed to continuous contact closure.
2. — Sometimes referred to as "preference".
— Used to indicate that an automatic change-over (from the preselected transmitter) has taken place.
3.
Used to restore the system to its preselected condition following an automatic change-over.
4. —
— A power supply or other fault that will prevent the system logic from operating normally.
5.
15. Active reserve system facilities
As shown in Figure 3, two cases may be distinguished:
Case 1: Simple parallel operation where, if one transmitter fails, transmission continues from
the other, without interruption to the service.
Case 2: Paralleled transmitters arranged so that if one fails, the other may be switched directly
to the system output.
It should be noted that the facilities listed in Table IV are additional to those available from a
single transmitter (which may or may not be required).

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TABLE IV
Facilities category 1 Command Indication Notes
Start x x 1
x
Stop x 1
Preselect/select drive(s) A x x 2, 3
Cases 1
Preselect/select drive(s) B x x 2, 3
and 2
Auto change-over of d rive x 2, 4
Locallremote x
x
Paralleling fault 5
Preselect/select A + B to output x x
3
Preselect A to output x x 3
Preselect B to output x x
3
Case 2
Inhibit auto change-over x x
Select auto change-over x x
auto change-over x 4
Facilities category 2 Command Indication Notes
Inhibit auto change-over x x 2
Cases 1
x x
Select drive system(s) 2
and 2
Reserve drive(s) available x 2
x
Reset system 6
CaseCase 2
System fault x 7
Notes 1. — Separate start and stop commands are required only where momentary (pulse) techniques are employed as
opposed to continuous contact closure.
2. — The arrangement of drives in certain active reserve systems may be quite complex; for example, in interme-
diate-frequency modulated television transmitters where several oscillators may be used to generate the final
vision and sound carriers.
3. — Preselection is sometimes referred to as «preference» .
4. — Used to indicate that an automatic change-over (from the preselected condition) has taken place.
— May be due to phase or amplitude error (sound or vision in the case of television transmitters, which may
5.
require separate indications).
6. — Used to restore the system to its preselected condition following an automatic change-over.
7. — A power supply or other fault that will prevent the system logic from operating normally.
16. (N + 1) reserve system facilities
A (N+ 1) reserve system is a system of transmitters in which only one reserve is provided for N
(N greater than 1) transmitters in operation. A special case is the (N + 1) dedicated reserve system
where the same transmitter is always dedicated as the reserve.
The principle of this system is shown in Figure 3, page 31. It is usually employed in transmitter
systems for sound broadcasting where it is possible to have transmitters which are of the broad-
band type or are provided with automatic frequency tuning.
The facilities listed in Table V are those to be provided for a (N + 1) dedicated reserve system. It
should be noted that these facilities are additional to those available from a single transmitter
(which may or may not be required).

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864-1 © IEC 1986 – 23 –
TABLE V
Facilities category 1 Command Indication Notes
,
x x 1
Start (each transmitter 1 to N)
x
x 1
Stop (each transmitter 1 to N)
Select reserve operation
x x 2
(for each transmitter 1 to N)
x
x
Inhibit auto change-over
x x
Select auto change-over
Local/remote x
x 3
Auto change-over
x x 4
Reset system
Indication Notes
Facilities category 2 Command
x 5
System fault
Notes 1. — Used to start or stop each transmitter separately.
2. — Used to manually change-over each transmitter to reserve before or during operation. The indications will also
be present in the case of an automatic change-over.
3. — Used to indicate that an automatic change-over of one of the transmitters in operation has taken place.
4. — Used to restore the automatic or manual change-over.
5. — A power supply or other fault that will prevent the system logic from operating normally.
17. Multiplex reserve system facilities
A multiplex reserve system is a system of television transmitters whose configuration can be
changed in case of a fault to permit either the vision or the sound amplifiers to operate as a
common reserve for vision and sound. The principle of the system is illustrated in Figure 3,
page 31, and a typical arrangement of d rives is shown in Figure 6, page 37.
It should be noted that the facilities listed in Table VI are additional to those available from a
single transmitter (which may or may not be required).
TABLE VI
Indication
Facilities category 1 Command Notes
Start x x
x x
Stop
x
Local/remote
Vision/sound combining fault x
x x
Normal operation
Reserve operation vision amplifier x x 1
x x
Reserve operation sound amplifier 2
x x
Inhibit auto change-over
x x
Select auto change-over
x 3
Auto change-over
Facilities category 2 Command Indication Notes
x
Reset system 4
x
System fault 5

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864-1 © IEC 1986
Notes 1. — Vision amplifier carrying both vision and sound (multiplex operation).
2. — Sound amplifier carrying both vision and sound (multiplex operation).
3. — Used to indicate that an automatic change-over (from normal operation) has taken place.
4. — Used to restore the system to normal operation following an automatic change-over.
— A power supply or other fault that will prevent the system logic from operating normally.
5.
SECTION FOUR — STANDARD ANALOGUE INTERFACE TECHNIQUES
(Under consideration)
SECTION FIVE — ANALOGUE COMMANDS AND INDICATIONS
(Under consideration)
SECTION SIX — GENERAL SYSTEM REQUIREMENTS
22. Introduction
This section deals with the general requirements of the systems referred to in Clause 7 which are
shown diagrammatically in Figure 3, page 31.
23. Standard requirements for all systems
23.1 System logic power supply
The power supply to the system logic unit shall not be dependent upon any single transmitter
power supply.
23.2 Mains supply interruptions
Following a mains supply interruption, the transmitter system shall return to the operational
state prior to the interruption. This may be accomplished automatically or by means of a manual
command, dependent upon the duration of the interruption and the system requirements.
23.3 Local/remote facilities
Remote control shall always be inhibited when local control has been selected.
When switching from local to remote and vice versa, there shall be no unintended interruption
to the transmission.
When local operation of the transmitter is selected, it shall be possible to operate the transmitter
independently and to remove the system logic without interrupting transmission.
23.4 Auto/manual facilities
It shall be possible to switch from automatic to manual either remotely or locally without
interrupting transmission.

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864-1 © IEC 1986
Supervisory system
i
Remote
Local
I
Automatic
Automatic Manual
Manual
Supervisory system
Indications
I
Status Quality
Switching Adjustment
indications
indications
(binary) (analogue)
Control system
i
Objective Subjective:
sound. vision
(metering)
Abnormal
Abnormal
Normal Normal
(alarm)
(alarm)
Monitoring system
023/86
1. — Diagrams showing the relationship between various terms.
FIG.

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864-1 © IEC 1986
— 29 —
Transmitter A
nv
Change-over
Supervisory System switch or
—
equipment logic unit ---     paralleling
device
V
Test load
C
Transmitter B
=== Interface
024/86
FIG. 2. — Simplified diagram of arrangement of equipment for two transmitters in passive or active
reserve.

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SIST HD 577 S1:1999
A
4
B
'Active reserve (case 2)
Active reserve (case 1)
Single transmitter Passive reserve
O Test load
O Paralleling device
O Diplexer
Combiner
Reserve   2   N

Multiplex reserve television transmitter system
(N +1) Reserve system
(for a typical arrangement of drives, see Figure 6)
025/86
3. — Simplified diagrams of commonly used transmitter systems.
FIG.

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864-1 GO IEC 1986
Supply
o
Command
7
Command
Command
Transmitter
c
Indication
F--
Indication
Indication
f---
P
026/86
Example of relay interface technique.
FIG. 4.

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864-1 © IEC 1986 — 35 —
o
Command
Semiconductor To in put
logic or
opto-isolator
1
o
o
1 t
Command
Semiconductor To input
logic or
opto-isolator
Transmitter
Indication Semiconductor
From output
logic or
opto-isolator
I
I-
Indication From output
Semiconductor
logic or
opto-isolator
027/86
FIG. 5. — Principle of semiconductor logic and opto-isolator
interface techniques.

---------------------- Page: 22 ----------------------

SIST HD 577 S1:1999
864-1 © IEC 1986 — 37 —
i
Sound amplifier
Vision amplifier
Test load Test load
I
Multiplex amplification
drive
ound Visio
Separate amplification
drive 028/86
FIG. 6. — Typical arrangement of drives in a multiplex reserve television
transmitter system.

---------------------- Page: 23 ----------------------

SIST HD 577 S1:1999
864-1 © IEC 1986 - 39 -
02-02 02-02
marche/arrêt start/stop
Commande employée pour faire fonctionner ou arrêter un A command used to bring into operation or to switch o ff a
émetteur, un système d'émetteurs et/ou l'équipement also- transmitter, transmitter system and/or associated equipment.
cié.
02-03 02-03
fermeture momentanée momentary closure
Se rapporte à l'utilisation d'une fermeture de courte durée d'un Refers to the use of a short duration contact closure rather than
contact plutôt qu'une fermeture continue pour les comman- a continuous contact closure for commands.
des.
02-04 02-04
indication indication
Information relative à l'état, ou à la qualité, d'un équipement
Information concerning the status, or qu
...