ProSoft Technology 3170-MBS - Manual (Page 28)

Status Information 3170-MBS ♦ Flex Platform
User Manual Modbus Slave Interface Module
Page 28 of 55 ProSoft Technology, Inc.
October 27, 2010
5.5 Modbus Status
Responses to Host: This rollover counter increments every time a response is
issued by the 3170-MBS. Note that this counter increments whether the
response is a data response or an error code response.
No Responses to Host: This rollover counter increments every time a command
is seen on the Modbus port, which is not for this slave. This counter may be used
as a network activity counter.
Last Detected Error Condition: This value is the last error code transmitted to the
master by the 3170-MBS.
5.5.1 Error Codes
Code Name Description
0 All OK The port is operating as desired
1 Illegal Function An illegal function code request is being attempted
2 Bad Data Address The address, or the range of addresses, covered by a
request from the host is not within allowed limits
3 Bad Data Value The value in the data field of the command from the host
is not allowed.
4 Incomplete Response
Detected This error indicates that an incomplete query was
received from a host query. This indicates that the slave
port is timing out too quickly (that is, application may
require some Inter-character Timeout Delay) or that the
host query is getting abbreviated, possibly by the
transmitting modem (last character getting dropped).
10 Buffer Overflow The receive buffer has overflowed and reset the
character count to 0. If this condition occurs try reading
fewer parameters at one time
254 Checksum Error The slave determined that the message checksum was in
error, and therefore discarded the message