... Amplifier Unit) Indicators MS (Green/Red), NS (Green/Red), L/A ETH1 (Green), U/IN PWR (Green), SS (Green/ Red) External input Mode 1: Control input for Communication Unit buffering (2 inputs...https://www.ia.omron.com/data_pdf/cat/zp-l_q362-e1_2_3_csm1130069.pdf