- Emerson Remote Terminal Unit Instruction Manual

4-4 / Specifications CI-ControlWave Express
Table 4-3 - RS-232/485 Port (COM3) Connector TB4 Pin Assignments
Pin
#
Signal
RS-232
Description:
RS-232 Signals
Signal
RS-485
Description:
RS-485 Signals
1 - - RXD+ Receive Data + Input
2 RXD Receive Data Input-
RXD− Receive Data − Input
3 TXD Transmit Data Output
TXD− Transmit Data − Output
4 - - TXD+ Transmit Data + Output
5 GND Signal/Power Ground GND Ground
Figure 4-3 - 5-Position Term. Block (COM3) TB4 on CPU/System Controller Board
4.2.3.2 Power Interface & Field Input Connections
Power Interface: see Figure 4-4 (see Sections 4.2.1 & 4.2.2)
Pulse Input Interface: see Figure 4-5
RTD Input Interface: see Figure 4-6
Figure 4-4 - Terminal Blocks TB1 and TB2
Pulse/Digital Inputs
No of Inputs: 2
Input Configuration: 3.3V Input Source Voltage
200uA Input Source Current
Driven Open Collector
ON State: below 1.46V
OFF State: above 1.90V
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