2-4. Interface Connections
U3-1021 2-20 2/99
Westinghouse Proprietary Class 2C
Figure 2-11. J2 RS-485/RS-422 Four-Wire Serial Interface (1C31169G02) (CE Mark)
RES
RX+
TX+
Com
RX+
RX-
TX+
TX-
Local Shield
Base Unit
Third Party Device
Notes
If the Personality module’s J2 RS-485/RS-422 Applications port DB9 connector is used
in place of the base unit terminal block, only local shield grounding may be
implemented. The cable assembly metal hood must NOT be in electrical contact
with the cable’s shield. If parallel termination resistors are desired, jumpers must
be added to the terminal block (as shown above). Refer to Table 2-5 for pin assignments.
Add jumpers if parallel
termination resistor is
Com
TX+
TX-
RX+
RX-
J2 Applications Port
Personality Module
Cable Assembly
Metal Hood
RES
desired.
Terminal Block
Grounding
The cable MUST be braid-shielded and grounded at the entry point of the cabinet
using the recommended hardware (refer to “Cable Guidelines” in U3-1000).
See note.
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