This Standard applies to telecontrol equipment and systems with coded bit serial data transmission for monitoring and controlling geographically widespread processes.
2 Object
This Standard defines electrical interface characteristics (e. g. signals, impedances, etc.) which have to be met at the shared boundaries (see Figure 1) between:
— Telecontrol equipment and external equipment connected to:
? Process equipment (e.g. sensors, actuators);
? Operator's equipment;
— Telecontrol equipment and transmission line (channel) where "data circuit terminating equipment" (i .e. DCE-MODEM) is packaged as an integral part of the telecontrol equipment, or telecontrol equipment and "data circuit terminating equipment", where the latter is not packaged as an integral part of the telecontrol equipment;
— Different parts of the equipment within the telecontrol system and other data processing equipment.
The interfaces shall be defined independently from the functional layout of the system or its subsystems.
Information in this part refers only to operating conditions.
The following subjects are outside the object of this part:
— Interface between external power source and the telecontrol equipment;
— Logical interfaces and interface protocols;
— Interface testing conditions and procedures.
3 Types of Information
Two basic types of information are presented to the interfaces: digital and analog. Both types are conveyed over the interfaces by means of signals which are in parallel, serial or stand alone form.
Examples of the relationship between these signals and types of information are given in Table 1.
GB/T 16435.1-1996 The following standards are cited：
GB/T 16435.1-1996 Cited by the following standards：
