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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 Listen 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 system 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 counters operation, or power-up.
13 Return Bus Exception Error Count
The response data field returns the quantity of Modbus exception responses returned
by the slave since its last restart, clear counters operation, or power-up.
14 Return Slave Message Count
The response data field returns the quantity of messages addressed to the slave, or
broadcast that the slave has processed since its last restart, clear counters operation,
or power-up.
15 Return Slave No Response Count
The response data field returns the quantity of messages addressed to the slave for
which it sent no response (neither a normal response nor an exception response) since
its last restart, clear counters operation, or power-up.
16 Return Slave NACK Response Count (Not supported)
17 Return Slave Busy Response Count (Not supported)
18 Return Bus Character Overrun Count
The response data field returns the quantity of messages addressed to the slave that it
could not handle due to a character overrun condition since its last restart, clear
counters operation, or power-up
19 (Not supported)
20 (Not supported)
21 (Not supported)
RVT communication ç Modbus function codes 19
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