COTRUST CTH200 Series - Page 184

Appendix
174
Parameter explanation:
Parameter
address
Explanation
Type
Value
range
Note
Done
When MBUS_SLAVE
respond to Modbus request
Done output on. If no
service request, Done
output disconnect.
Bit
Error
Error output byte contains
the result of the execution of
the instruction.
Byte
Error
code as
following
Valid only when Done is
on. Error code will not
change if Done is off.
Error code table:
0
No error
1
Memory area range error
2
Illegal baud rate or parity
3
Illegal slave station address
4
Illegal value of Modbus parameter
5
Holding register and Modbus slave station symbol address overlap
6
Receive parity error
7
Receive CRC error
8
Illegal function request/no supported functions
9
Illegal memory area address in request
10
Slave station function disable
※ Modbus slave station protocol instruction example
LAD program below established a no-parity slave station, address 1 and baud rate 115200: