Communication
2.3 Modbus RTU Master
89SICAM Q100, 7KG95xx, System Manual
E50417-C1040-C522-A8, Edition 09.2020
The counters are cleared automatically when the device starts up and each time the request message list is
regenerated after a change of the mapping parameterization.
Figure 2-9 Diagnosis Modbus RTU Master
Parameter
• Baud rate: Default setting: 19 200 bit/s
• Parity: Default setting: Even
• Additional inter-character timeout: Default setting: 1 ms
Counter
• Received bytes: Total number of bytes received from the RS485 interface since the last device
restart or the last clearing of the counter.
• Sent bytes: Total number of bytes sent to the RS485 interface since the last device restart
or the last clearing of the counter.
• Good messages: Number of valid response messages of Modbus slave devices (syntax of the
message is valid and the message was received within the response time-out).
• Bad messages: Total number of:
no responses (response time-out after sending a request)
error feedback indications
errors in message formats received
• Parity errors: Number of detected parity errors (wrong parity).
• Framing errors: Number of detected framing errors (invalid stop bit, for example, if the baud rate
is wrong).
Request Telegrams
• Status: Status of the request messages
Good: correct response
Not requested: the request was not sent yet after changing the configuration
No response: the Modbus slave device does not respond (for example,
communication failure)
Exception responses (n): exception respons essent with error code
SYS_SICAM_Q100_US.book Page 89 Thursday, September 24, 2020 1:17 PM
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