... 4-key membrane keypad with tactile feedbackInputFive channel 4-20mA current input for signals such as temperature, pressure, liquid level, etc.Two ... optional.OutputAnalogue output: 4-20mA or 0-20mA current output.Isolated OCT output: for frequency output (0~9999Hz), alarm driver, or ... OFF control, etc.Relay output 1A@125VAC or 2A@30VDC. For ON/OFF control, alarm driver, totaliser output, etc.Internal ...