LNK-AO Analog Output Peripheral Device

    Key Features

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    Four 4-20 mA output channels
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    Power LED indicator
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    Modbus® RS-485 RTU communication protocol
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    Scaling and zoning capabilities supported by the controller
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    Configurable default settings for any interruption in communication
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    Standard water / dust tight, corrosion resistant enclosure (drip proof)
The LNK-AO Analog Output peripheral device adds four channels of 4 - 20 mA analog output to a Modbus® RS-485 network configured with a QCC Quad Channel Controller or an FCS Flexible Control System Controller. 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.


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    Parking Garages
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    Vehicle Repair Shops
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    Manufacturing Plants
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    Ice Arenas
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    Commercial Indoor Swimming Pools
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    ... and many more



ABS / Polycarbonate, corrosion resistant, drip proof; Copper coated interior to reduce RF interference.
Weight: 400 g (14 oz)
Size: 5.0” x 5.0” x 2.8” (127 mm x 127 mm x 71 mm)


Power Requirement:
24 VDC, 3W, Class 2 (from daisy-chain wire run from controller)
Wiring: 4-wire VDC, 16 gauge, 4-conductor shielded network wiring (daisy-chain)
Fuses: Thermal, resetting

Input / Output

Outputs: Four 4 - 20 mA (2 - 10 volts is obtainable using a 500 ohm resistor)

Modbus® RS-485
Modbus ID: 75 (default, configurable)
Baud Rate: 19,200 (default, configurable)

User Interface

Indicator: LED green indicator for power


Operating Temperature: -20°C to 40°C (-4°F to 104°F)
Humidity: 15 - 90% RH non-condensing


Conforms to: CSA-C22.2 No. 205-12, CSA C22.2 No. 61010-1-12
                      UL508 (Edition 17):2007, UL 61010-1 (Edition 3)
Conforms to: EMC Directive 2004/108/EC
                      EN 50270:2006, Type 1, EN61010
Conforms to:  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.

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Product Specifications

Application Brochures



Sensor Specification

Engineering Specification Samples


Operation Manual

Part Numbers

Description Code
Remote Analog Output Peripheral Device, four 4-20 mA outputs, power LED indicator, Modbus® RS-485, water / dust tight, corrosion resistant enclosure  LNK-AO

Metal Protective Guard

» 16 gauge, clear anodized metal protective guard
» Larger size for controllers & self-contained systems
» Smaller size for analog & digital transmitters

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