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Communication
2.3 Modbus RTU Master
The following parameters can be set for the Modbus RTU Master bus protocol:
Table 2-67
Parameter
Baud rate
Parity
Additional inter-character timeout
Maximum 0x/1x register gap
Maximum 3x/4x register gap
NOTE
The parameterization of the serial communication via the RS485 interface, the Modbus slave devices, and the
associated mapping are described in detail in the SICAM Q100 device manual, chapters 8.3.7.3 and 8.3.7.4.
2.3.2
Modbus RTU Master Diagnosis
The diagnosis for Modbus RTU master and Modbus gateway allows:
•
checking the status of the serial communication with message and error counters and an overview of the
configured serial interface parameters
•
an overview of the request messages sent by the Modbus master including the request status for each
message
•
an overview of the last 5 messages sent via Modbus gateway (only available if the Modbus gateway func-
tion is enabled)
The message and error counters can be reset if necessary by clicking the Clear counters button.
88
Modbus RTU Master Settings
Default Setting
19 200 bit/s
Even
1 ms
40
10
Setting Range
1200 bit/s, 2400 bit/s
4800 bit/s, 9600 bit/s
19 200 bit/s, 38 400 bit/s
57 600 bit/s, 115 200 bit/s
None, 1 stop bit
Even
Odd
None, 2 stop bit
0 ms to 100 ms
0 to 200
SICAM Q100, 7KG95xx, System Manual
E50417-C1040-C522-A8, Edition 09.2020
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