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CLRS Series RS485 Closed Loop Stepper Drive User Manual
4.4 Error Codes and Troubleshooting
4.4.1 Communication Error Codes
When the master station receives a message from the slave about a communication error, you can follow the table
below for analysis
No.
Return Commands (slave->master)
Symbols
Description Content
1 ID Slave ID 0-31
2 FC Function code FC+0x80
3 EC Error Code -
4 CRC check code
Low
High

Error Code
Error Code (EC) Description
0x01 Wrong FC (This supports FC beside of 03h/ 06h/ 10h)
0x02 Wrong access address
0x03 Wrong data, for example, write data over-limit value, etc.
0x08 Wrong CRC check code
Example F: CRC check code error
Master-> slave data:
Message 01 03 00 01 00 01 D5 C1
Description Slave ID Function code
Register
address
Read Number of
registers
CRC check
code
slave-> Master data:
Message 01 83 08 40 F6
Description Slave ID FC+0x80 Error code CRC
Example F: Function code error
Master-> slave data:
Message 01 02 00 01 00 01 E8 0A
Description Slave ID Function code
Register
address
Read Number of
registers
CRC check
code
slave-> Master data:
Message 01 82 01 81 60
Description Slave ID Function code + 0x80 Error code CRC check code
4.4.2 Drive Alarm Codes and Troubleshooting
Register Address definition operation unit description
0x2203 Current alarm R / Below table