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9 Modbus RTU – integrated Modbus port specification
9.3 Modbus register map
PXR Electronic trip unit
01/21 MN012005EN
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9.3.9 Internal diagnostics
The release supports the Modbus diagnostics for monitoring the internal
Modbus communication using function code 08.
Table 36: Diagnostics
Sub-
function
code
Data
Action
0
Echo query
1
0000: The counters are retained
00FF: Clear all counters
Restart the communication interface
4
0000
Force listen
10
0000
Clear counters
11
0000
Number of Modbus UART bus messages
12
0000
Number of Modbus UART CRC errors
13
0000
Number of exceptions
14
0000
Number of slave messages
15
0000
Number of slave non-responses
16
0000
Number of slave NAKs
1)
17
0000
Number of “slave busy” messages
18
0000
Number of Modbus UART run errors
20
0000
Clear Modbus UART counters
23
0000
Number of “incorrect Modbus UART character length” errors
2)
24
0000
Number of “Modbus UART performance failure” errors
3)
25
0000
Number of Modbus UART parity errors
26
0000
MCU1 firmware version
27
0000
MCU1 firmware revision
28
0000
MCU1 firmware build
29
0000
MCU2 firmware version
30
0000
MCU2 firmware revision
31
0000
MCU2 firmware build
32
0000
USB firmware version
33
0000
USB firmware revision
34
0000
Reset the block of registers
35
0000
COM-MCU firmware version
36
0000
COM-MCU firmware revision
37
0000
COM-MCU firmware version
1) NAK = not acknowledged
2) Framing error
3) Noise error
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