Bronkhorst Modbus slave interface - Manual (Page 18)

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4.4.4 Diagnostics (08)
The following sub-functions are supported
Sub-function code (dec) Name
00 Return Query Data
10 Clear Counters and Diagnostics Register
11 Return Bus Message Count
12 Return Bus Communication Error Count
13 Return Bus Exception Error Count
14 Return Slave Message Count
15 Return Slave No Response Count
16 Return Slave NAK Count (always 0)
17 Return Slave Busy Count (always 0)
18 Return Bus Character Overrun Count
Warning: the maximum message size for the Return Query Data sub function is 100 bytes at 9600 baud
(200 bytes at 19200 baud and 400 bytes at 38400 baud). When this size is exceeded, corrupted
responses may be received.
Possible exception responses
Code Name Meaning
01 ILLEGAL FUNCTION of not-supported sub-function
03 ILLEGAL DATA VALUE in case of an incorrect value for the data field
04 SLAVE DEVICE FAILURE in case of writing illegal value to register
4.4.5 Report Slave ID (17)
The Slave ID field in the response is a string with the same contents as FlowDDE parameter 1 (ident number + version
nr/serial nr). The Run Indicator Status field in this message will indicate ON when the device is in normal operating
mode (FB_NORMAL).
Possible exception responses
Code Name Meaning
04 SLAVE DEVICE FAILURE in case of an internal error
Page 18 Modbus interface 9.17.035