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This type of event byte is stored by the slave when it enters the Listen Only Mode.
The event is defined by a content of '04' hex.
Slave Initiated Communication Restart
This type of event byte is stored by the slave when its communications port is restarted. The slave can be restarted by
the Diagnostics function (code 08), with subfunction Restart Communications Option (code 01).
The event is defined by a contents of '00' hex.
3.7.
Diagnostics function and subfunctions (function 8)
The format of a diagnostics (08) function query is as follows:
QUERY
Slave address
Function
Subfunction
Data field
Error check field CRC
The format of a response to a diagnostics function query is an echo of the query itself.
If the request is directed to a counter, however, the slave returns the counter's value in the data field.
00 Return Query Data
The data in the query data field is to be returned (looped back) in the response. The entire response should be identi-
cal to the query.
01 Restart Communication Option
The slave's peripheral port is to be initialized and restarted, and all of its communication event counters are to be
cleared. If the port is currently in the Listen Only Mode, no response will be sent. If the port is not currently in the Lis-
ten Only Mode, a normal response will be sent. This occurs before the restart is executed.
02 Return Diagnostic Register (Not supported)
03 (Not supported)
04 Force Listen Only Mode
Forces the addressed slave to enter the Listen Only Mode for Modbus communications.
10 Clear Counters and Diagnostic Register
Clears all counters and the diagnostic register.
11 Return Bus Message Count
The response data field returns the total quantity of messages that the slave has detected in the communications sys-
tem since its last restart, clear counters operation, or power-up.
12 Return Bus Communication Error Count
The response data field returns the quantity of CRC errors encountered by the slave since its last restart, clear coun-
ters operation, or power-up.
13 Return Bus Exception Error Count
STATUS
Approved
1 byte
1 byte
2 bytes
2 bytes
2 bytes
SECURITY LEVEL
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