- Emerson Remote Terminal Unit Instruction Manual

2-22 / Installation & Operation CI-ControlWave Express
2.3.6 Connection to a Model 3808 Transmitter
A Model 3808 Transmitter (Digital) can be interfaced to a ControlWave Express via an RS-
232 or an RS-485 communication scheme. Communication schemes and cable lengths
determine the type of communication port utilized. In general RS-232 communications are
utilized when the Model 3808 Transmitter is situated within 25 feet of the ControlWave
Express, i.e., for local communications. Communications can be achieved with transmitters
up to 4000 feet away (remote communications) via the RS-485 scheme.
Figure 2-13 - 3808 Transmitter to ControlWave Express
RS-232 Comm. Cable Diagram
Note: For Loopback & Termination Control:
Use SW3 on CPU/System Controller Board to configure COM3.
Figure 2-14 - 3808 Transmitter to ControlWave Express RS-485 Comm. Cable
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