ProSoft Technology 5202-DFNT-MCM4 - Manual (Page 39)

Serial Port Modbus Error and Status Data MCM ♦ ProLinx Gateway
Driver Manual Modbus Master/Slave
ProSoft Technology, Inc.
Page 39 of 80
October 16, 2009
4.3 Error Codes
These are error codes that are part of the Modbus protocol or are extended
codes unique to this gateway.
4.3.1 Modbus Error Codes
These error codes are generated or returned on both the Master and slave ports.
These codes are the standard Modbus errors (page 68).
Code Description
1 Illegal Function
2 Illegal Data Address
3 Illegal Data Value
4 Failure in Associated Device
5 Acknowledge
6 Busy, Rejected Message
4.3.2 gateway Communication Error Codes
These gateway-specific error codes are also returned from the command polling
process and stored in the Command Error List memory area.
Code Description
-1 CTS modem control line not set before transmit
-2 Timeout while transmitting message
-11 Timeout waiting for response after request
253 Incorrect slave address in response
254 Incorrect function code in response
255 Invalid CRC/LRC value in response
4.3.3 Command List Error Codes
These command-specific error codes are detected during initial command list
loading at gateway power-up or reset and are stored in the Command Error List
memory region.
CODE Description
-41 Invalid enable code
-42 Internal address > maximum address
-43 Invalid node address (<0 or > 255)
-44 Count parameter set to 0
-45 Invalid function code
-46 All parameters set to 0
-47 All parameters set to -1