LNK-AO Analog Output Peripheral Device

Adds 4 additional analog outputs to a gas detection system

Adds four channels of 4 - 20 mA analog output to a Modbus® RS-485 network configured with one of the FCS Multi Channel System Controllers.


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Key Features

  • Four 4-20 mA output channels
  • Power LED indicator
  • Modbus® RS-485 RTU communication
  • Scaling and zoning capabilities supported by the ontroller
  • Configurable default settings for any interruption in communication
  • Standard water / dust tight, corrosion resistant enclosure


The LNK-AO Analog Output peripheral device adds four channels of 4 - 20 mA analog output to a Modbus® RS-485 network configured with one of the FCS Multi Channel System Controllers. The LNK-AO is designed to send a 4 - 20 mA signal to up to four devices such as a data / trend / logging system, a BAS or DDC or up to four VFDs.

The four 4-20 mA output signals are current sourced and can be independently scaled using the menu system on the controller. Each output can be assigned to an individual sensor or to a group of sensors through zoning configured within the controller. Communication with the controller is monitored and if interrupted a pre-configured default current will be output in each channel.

ABS / Polycarbonate, corrosion resistant
Copper coated interior to reduce RF interference
400 g / 14 oz
127 x 127 x 71 mm / 5.0 x 5.0 x 2.8 inches
User Interface
LED green indicator for power
Four 4-20 m A (2 - 10 volts is obtainable using a 500 Ohm resistor)
Modbus® RS-485 RTU
Power Requirement
24 VDC, 3W, Class 2 (24 VDC supplied by the Controller)
Power Consumption
3 watts
4-conductor shielded minimum 18 AWG stranded within conduit
Thermal, resetting
Operating Temperature
-20°C to 40°C (-4°F to 104°F)
Operating Humidity
15 - 90% RH non-condensing
Conforms to:
CSA-C22.2 No. 205-12, UL508 (Edition 17):2007
EMC Directive 2004/108/EC, EN 50270:2006, Type 1, EN61010
FCC. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
RoHS compliant circuit boards
Product Codes
Remote Analog Output Peripheral Device, four 4-20 mA outputs, power LED indicator, Modbus® RS-485, water / dust tight, corrosion resistant enclosure

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