4-141
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:
•Normal:
•Abnormal:
(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
0. ms
C079
Communication method
selection
00: ASCII method
01: ModBus-RTU method
01
Related functions A001, A002
Parameter No. Function name Data Default setting Unit
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