...ication Unit Connection 3G3MX2-V1 (Use the RS-485 terminal on the Inverter) RS-485 (2-wire) 1:N 3G3JX (Use the RS-485 connector on the Inverter) 3G3RX-V1 (Use the RS-485 terminal on the Inver...https://www.ia.omron.com/data_pdf/cat/ns_v405-e1_12_12_csm2140.pdf