Hitachi L700 SERIES Instruction Manual page 162

Chapter 4 Explanation of Functions
(3) Communication test mode
Use the communication test mode to check the hardware of the RS485 communication train.
(Procedure for communication test)
1) Remove all cables from the TM2 terminal block to perform a loopback test.
2) Make the following setting with the digital operator of the inverter:
- Specify "02" (loopback test) for the communication speed selection (C071).
3) Turn the inverter power off once, and then turn it back on, whereupon the communication test begins.
4) After the test is completed, the inverter displays one of the following:
- When the communication is normal:
- When the communication train is abnormal:
5) Press the STOP/RESET key of the digital operator or the reset button on the copy unit to switch to the
normal setting screen. Using the setting screen, change the setting made in step 2) to that desired.
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