... output.Isolated OCT output: for frequency output (0~9999Hz), alarm driver, or totaliser pulse output, ON/OFF control, etc.Relay output ... 1A@125VAC or 2A@30VDC. For ON/OFF control, alarm driver, totaliser output, etc.Internal Alarm (Buzzer): user programmable.External ... Alarm Driver: alarm signal can be transmitted to Relay or OCT output ...