Modbus Communication
‑28‑
7. Read DI state
Based on the conversion rule, convert the DI state U007 to 7007 and then convert
the reading to a binary number, in which the least significant bit indicates DI1
status, the second least significant bit indicates DI2 status, and so on.
8. Read fault code
Based on the conversion rule, convert the fault code U045 to 702D and fault sub‑
code U046 to 702E.
The configuration and procedure are as follows:
FAQ and Solutions
Items must be checked:
1. Check whether other pins instead of RS485+ and RS485– are connected.
2. Check whether the communication speed of the power supply unit (set through Fd‑
00) is the same as that of the host controller.
3. Check whether the data format of the power supply unit (set through Fd‑01) is the
same as that of the host controller.
4. Check whether the Fd‑02 (local address) setting of the AC drives is unique from that
of other AC drives. Avoid duplication to prevent conflicts.
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