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SC1801

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The SC1801 protocol is a more hardware-oriented communication protocol perfectly suited for all generally used telecontrol functions in control and monitoring directions. The functionalities of original SC1801 operated RTUs are determined by the range of various plug-in modules, for instance for digital input, counter input and analogous output. This modular structure comes in useful when it comes to addressing information.

The small address buffer needs to be mentioned. For instance only 384 single indications can be processed per RTU, if ALL 16 available plug-in slots have been used/configured for digital input modules. There is no space left for other kinds of messages and the same applies to measured values (129) and counter values (128). And this is before the control direction is even considered.

SC1801 operates in half-duplex communication mode based on the master/slave principle. An RTU only responds to an explicit request by the master.

ISO/OSI Model

7 Application Layer SC1801 Application Layer
6 Presentation Layer n/a
5 Session Layer n/a
4 Transport Layer n/a
3 Network Layer n/a
2 Link Layer n/a
1 Physical Layer RS232 / V.24 (UART-Conform)

Supported Information Types

Control Direction Single Command
Setpoint [12 bit]
Monitoring Direction Single indication [1 Bit]
Single indication [1 Bit] with time tag
Measured value [12 bit]
Counter value [16 bit]

Protocol Features

Physical Layer RS232 / V.24 (UART-Conform), Half-Duplex
Application Layer Transmission of pulse commands with definable pulse length
Transmission of setpoints, bit patterns and counter management commands
Spontaneous transmission of indications with or without time tag, measurands and counter values
Absolute time tag representation, accuracy 0.1 ms
General Interrogation
Time synchronization
Address Space rtu's per line: 255
Indications for each rtu: up to 384
Measurands for each rtu: up to 192
Counters for each rtu: up to 128
Commands for each rtu: up to 256
Setpoints for each rtu: up to 128

Implemented Protocol Stacks

SC1801, Slave

Applicable Products

ipConvipConvUniversal protocol converter for highest degree of flexibility
Details...
product/ipConv/en/ipConv_en.pdf

References

FSC HECHIFSC HECHI
Details...
ChinaipConv SC1801, Slave / IEC 60870-5-104, Slave / IEC 60870-5-101, Slave / Simadyn-D, Master /
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