Emerson Process Management ControlWave EFM 3808 - Manual (Page 94)

2-42 / Installation & Operation CI-ControlWave EFM
Figure 2-28 - Digital to Relay I/O Board Wiring Diagram
2.3.8 Connection to a Model 3808 Transmitter
A Model 3808 Transmitter (Digital) can be interfaced to a ControlWave EFM via either
an RS-232 or an RS-485 communication scheme. Communication schemes and cable
lengths are determined 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 EFM, i.e., for local communications. Communications can be achieved
with transmitters up to 4000 feet away (remote communications) via the RS-485 scheme.
Figure 2-29 - Model 3808 Transmitter to ControlWave EFM
RS-232 Comm. Cable