63
Table 5.1.15.2.-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.
1MRS755972
Voltage Relay
Technical Reference Manual - ANSI Version
REU 610
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