4-4 Communication Function „ Setting RS485 communication requires the following settings. 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:
(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. •Abnormal: 4-137 Parameter No. Function name Data Default setting Unit C071 Communication speed selection (Baud rate selection) 02: Loop-back test 03: 2400 bps 04: 4800 bps 05: 9600 bps 06: 19200 bps 04 C072 Communication station No. selection 1. to 32.: Allocate each Inverter's station No. Set station numbers to control several Inverters simultaneously. 1. C073 Communication bit length selection 7: 7 bits 8: 8 bits 7 C074 Communication parity selection 00: No parity 01: Even 02:
Odd 00 C075 Communication stop bit selection 1: 1 bit 2: 2 bits 1 C076 Communication error selection 00: Trip 01: Trip after deceleration stop 02: Ignore 03: Free-run stop 04: Deceleration stop 02 C077 Communication error timeout 0.00 to 99.99: Communication disconnection judgment time 0.00 s 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 l k_k _k o l: l k_ k_k z