SaCoSone.GENSET_Communication_m_en_1.7
2 Modbus RTU protocol
The Modbus RTU protocol is the standard protocol used for the communica-
tion from the GenSet.
The bus interface provides a serial connection. The protocol is implemented
according to the following definitions:
Modbus application protocol specification, Modbus over serial line speci-
fication and implementation guide,
Important
For serial Modbus communication the following hardware require-
ments must be observed:
Control Module S: Modbus RTU and Modbus ASCII possible
Gateway Module: only Modbus RTU available
There are two serial interface standards available:
RS422 – Standard, 4 + 2 wire (cable length <= 100m), cable type as
specified by the circuit diagram, line termination: 120 Ohms
RS485 – Standard, 2 + 2 wire (cable length <= 100m), cable type as
specified by the circuit diagram, line termination: 120 Ohms
2.1 Settings
The communication parameters are set as follows:
Data rate
(optionally available)
4800 baud
9600 baud
19200 baud
38400 baud
115200 baud
2.2 Function Codes
The following function codes are available to gather data from the SaCoS
one
controllers:
Function Code
(hexadecimal)
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