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SC1801 ISO/OSI Model
Supported Information Types
Protocol Features
Implemented Protocol Stacks
Applicable Products
References
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
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| 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
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| 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
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Implemented Protocol Stacks
Applicable Products
 | ipConv | Universal protocol converter for highest degree of flexibility
Details...
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References
 | FSC HECHI
Details...
| China | ipConv | SC1801, Slave / IEC 60870-5-104, Slave / IEC 60870-5-101, Slave / Simadyn-D, Master / |
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