Table 5.1.14.1.-2
Supported diagnostic subfunctions
Code
Name
Description
00
Return query data
The data in the query data field is returned (looped back)
in the response. The entire response is to be identical to
the query.
01
Restart
communication
option
The slave
’
s peripheral port is initialized and restarted
and the communication event counters are cleared.
Before this, a normal response will be sent provided that
the port is not in the listen only mode. However, if the
port is in the listen only mode, no response will be sent.
04
Force listen only
mode
The slave is forced to enter the listen only mode for
Modbus communication.
10
Clear counters and
diagnostic register
All counters and the diagnostic register are cleared.
11
Return bus
message count
The number of messages in the communications system
detected by the slave since its last restart, clear counters
operation or power up is returned in the response.
12
Return bus
communication error
count
The number of CRC errors encountered by the slave
since its last restart, clear counters operation or power
up is returned in the response.
13
Return bus
exception error
count
The number of Modbus exception responses sent by the
slave since its last restart, clear counters operation or
power up is returned in the response.
14
Return slave
message count
The number of messages addressed to the slave or
broadcast which the slave has processed since its last
restart, clear counters operation or power up is returned
in the response.
15
Return slave no
response count
The number of messages addressed to the slave for
which a response (neither a normal response nor an
exception response) has not been sent since its last
restart, clear counters operation or power up is returned
in the response.
16
Return slave NACK
response count
The number of messages addressed to the slave for
which a NACK response has been sent is returned in the
response.
18
Return bus
character overrun
count
The number of messages addressed to the slave for
which it has not been able to send a response due to a
character overrun since its last restart, clear counters
operation or power up is returned in the response.
Sending other subfunction codes than those listed above cause an
Illegal data value
response.
The Modbus protocol provides the following diagnostic counters:
76
REM 610
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Motor Protection Relay
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