4-2 Function Mode 6. Turn on the power and start ModBus communications. (8) (7) (6) (5) (4) (3) (2) (1) 4 Not used Not used SN SP Not used Not used Not used Not used 485/OPE communications selector Functions 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 SP SN SP SN SP SN Termination resistor (Inverter 1) (Inverter 2) (Inverter N) 4-65 Pin No.: Symbol Description (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.