Modbus Exception Codes - ICP DAS USA I-7530A-MR-FD User Manual

5.3 Modbus Exception Codes

The following table lists the Modbus Exception codes that the I-7530A-MR-
FD supports.
code Description
1 Illegal function
2 Illegal Data Address
3 Illegal Data Value
6 Slave Device Busy
I-7530A-MR-FD Modbus RTU to CAN Converter User's Manual (Version 1.0, 08/2022) ------------- 94
Table 5-6: Error code table
Possible causes & solutions
The function code is not an allowable action
for the I-7530A-MR-FD.
The data address is not allowed for the I-
7530A-MR-FD.
The number of register or byte count is not
an allowed or no any CAN message is stored
in the "Normal CAN Message" field for the I-
7530A-MR-FD.
The transmission buffer overrun is
happened, users should retransmit the
message later when this module is normal.