VACON CX
Modbus user’s manual
Page
15
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Slave
address
Function
code
Subfunction
HI
Subfunction
LO
Data HI
Data LO
CRC16
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
2 bytes
Subfunction codes:
00
Echo
The slave sends back the query message (loop back).
01
Reinitialization
The slave communication part is to be initialized and its events counter is to be cleared. This
function is the only one that brings a slave out of Listen Only Mode.
04
Set Listen Only Mode
Forces the slave into Listen Only Mode (LOM). In this mode the slave doesn’t process messages.
The only function that will be processed after this mode is entered will be the Reinitialization (01).
0A
Clear counters
Clears all counters.
0B
Bus message count
The quantity of correct messages seen on the line without CRC error or checksum error.
0C
Bus communication error count
The quantity of messages received with checksum error.
0D
Bus exception count
The quantity of Modbus exception responses transmitted to the master by the slave.
0E
Slave message count
The quantity of all types of messages addressed to the slave.
0F
Slave no response count
The quantity of messages addressed to the slave for which it returned no response.