4-147
4-4 Communication Function
4
Functions
Communication Test Mode
•The communication test mode allows you to check the RS485 communication line (hardware).
(Communication Test Mode Procedure)
(1) Before conducting a loop-back test, disconnect the cable from TM2 on the control terminal block
board.
(2) Set the following parameter via the Digital Operator.
•Set C071 (communication speed selection) to "02" (loop-back test).
(3) Turn off the Inverter, and turn it on again. The check will start.
(4) After the check is complete, the Digital Operator displays the following code:
OK: LoopBack OK
NG: LoopBack NG
(5) Press the RESET button on the Digital Operator or on the copy unit to show the basic setting
screen. Reset the parameter that you changed in step (2) to a desired setting.
C078 Communication wait time
0 to 1000: Time to wait for response from the
Inverter
0ms
C079
Communication method
selection
00: ASCII
01: ModBus-RTU
01
Related functions A001, A002
Parameter No. Function name Data Default setting Unit
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