Omron SYSDRIVE MX SERIES User Manual page 156

4-2 Function Mode
6. Turn on the power and start ModBus communications.
(8) (7) (6) (5) (4) (3) (2) (1)
4
Communications connector
Details of each communications connector pin are shown below.
Connect each Inverter in parallel as below. Connect a termination resistor separately to avoid signal
reflection, since this 3G3MX does not incorporate it. Choose a termination resistor according to the
impedance characteristics of the cable to be used.
Connection example where the external controller (master) incorporates a termination resistor
External controller
(master)
Termination
resistor
4-65
Pin No.: Symbol

(1) Not used. Do not connect.

(2) Not used. Do not connect.

(3) Not used. Do not connect.

(4) Not used. Do not connect.
(5) SP Sent and received data: Positive side
(6) SN Sent and received data: Negative side

(7) Not used. Do not connect.

(8) Not used. Do not connect.
SP SN
(Inverter 1)
485/OPE communications selector
Description
SP
SP SN
(Inverter 2) (Inverter N)
Termination
resistor
SN