An AC motor drive can connect to multiple AC motor drives by using this communication board (1 to 4/8) to control multi-machine communication. Refer to the following diagrams for details. INPUT SG- SG+ OUT 1 6 5 4 3 2 1 OUT 2 OUT_3 OUT_4 VFD-CMD04 VFD-CMD08 AC POWER SUPPLY RS-232 PC 1-0 DVP PLC DATA- RS-485 ADDRESS 1 ~ 8 65432 1 OUT 1 OUT_2 OUT_3 OUT_4 65432 1 OUT 1 OUT 2 OUT_3 OUT_4 1 2 3 4 5 6 7 8 PC-^ PLC -► multi-machine communication board -► AC motor drives DA