2-4. Interface Connections
2/99 2-11 U3-1021
Westinghouse Proprietary Class 2C
Figure 2-5. Terminal Block RS-485 Two-Wire Serial Interface (1C31169G02)
(Non-CE Mark)
Com
RES
RX+
RX-
RES
TX+
TX-
SH
Earth GND
Com
RES
RX+
RX-
RES
TX+
TX-
SH
Earth GND
Remote Shield Grounding
Local Shield Grounding
Base Unit Terminal Block
Base Unit Terminal Block
Third Party Device
Third Party Device
Add jumper if parallel
termination resistor is desired.
Add jumper if parallel
termination resistor is desired.
Com
TX+/RX+
TX-/RX-
Com
TX+/RX+
TX-/RX-
Note
When using a two-wire RS-485 communication network, a termination resistor is recommended
if the LC is located at the end of the communication link. To use the termination resistor,
connect a jumper between RES (B14) and TX+ (B15) at the terminal block.
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