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SRAO 2 Channel Analog Output Board

2 channel analog output board2 Channel Analog Output Board

The Automation and Electronics, Inc. SRAO board was designed to provide analog output expansion capabilities for the SRTU simple RTU.

The SRAO is a two channel 4-20 mA analog output daughter board that plugs onto the SRTU board. The outputs require an external 24 VDC source to supply power for both current loops.


  • Two each 16-bit 4-20 mA analog outputs (SRTU provides 12-bit data)
  • Supply can be isolated or non-isolated
  • LED fault indicators for open loop conditions


Size: 3-1/2" x 2-3/4" PC board
Mounting: SRTU daughter board
Operating temperature: -40 to 158 deg. F (-40 to 70 deg. C)
Relative humidity: 5 to 90% non-condensing
Power requirements
Typical: 10 mA @ 12 VDC
Analog outputs: Two; 0-20 mA or 4-20 mA 16-bit conversion; 0.15% maximum error; RLoad 100 Ohm min; ((VL-3)/.02) max
Loop power: External 24 VDC