2-4. Interface Connections
U3-1021
2-16
2/99
Westinghouse Proprietary Class 2C
Figure 2-9. J2 RS-485/RS-422 Four-Wire Serial Interface (1C31169G02) (Non-CE Mark)
RES
RX+
TX+
Com
RX+
RX-
TX+
TX-
Local Shield Grounding
Base Unit
Third Party Device
Note
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 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 2-3 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