Multi-Drop Method (Rs-422 Communication) - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

5. HOW TO USE THE PROGRAM

5.5.2 Multi-drop method (RS-422 communication)

Using the RS-422 communication function can use to operate multiple servo amplifiers on the same bus. In
this case, set station numbers to the servo amplifier because the controller recognizes that the data currently
being sent is for which servo amplifier. Set station Nos. with [Pr. PC20 Station number setting].
Always set one station No. to one servo amplifier. Setting one station number to multiple servo amplifiers will
disable a normal communication. When you use to operate multiple servo amplifiers under one command,
use the group specification function in section 5.5.3.
(1) MR-J4-_A_-RJ 100 W or more
RS-422/RS-485
compatible controller
Note 1. The BMJ-8 (Hachiko Electric) is recommended as the branch connector.
2. The final axis must be terminated between RDP (pin No. 3) and RDN (pin No. 6) on the receiving side (servo
amplifier) with a 150 Ω resistor.
(2) MR-J4-03A6-RJ
RS-422 compatible
controller
Servo amplifier
CN3
Axis No. 1
(station 0)
RS-422/232C conversion cable
DSV-CABV (Diatrend)
Servo amplifier
CN1
Axis No. 1 (station 0)
5 - 60
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Servo amplifier
CN3
(Note 1) (Note 1)
Axis No. 2
(station 1)
Servo amplifier
CN1
Axis No. 2 (station 1)
Servo amplifier
CN3
(Note 1)
Axis No. 32
(station 31)
(Note 2)
Servo amplifier
CN1
Axis No. 32 (station 31)