User manual

A-4
Appendix A MC-III™ EXP Flow Analyzer
PLUG CONNECTOR
(LEFT AND RIGHT WIRE POSITIONS ARE VALID ONLY
WHEN PLUG IS FACING SOCKET IN POSITION SHOWN)
COM ADAPTER SOCKET
RS-485
CONVERTER
RS-232 9-PIN
CONNECTOR
TD(A)
TD(B)
GND
Part No. 101283116
GND
+12V
Figure A.5—Wiring of plug connector to 9-pin RS-232 to RS-485 converter cable, Part No. 9A-101283116
Connecting to the Communications Adapter
Take the following precautions when disassembling the communications adapter.
!
WARNING: When a hazardous area is present, ensure the union nut and blanking plug are
properly tted in the conduit opening. The explosion-proof rating applies only when the union
nut and blanking plug are secured in place. When the union is broken, the device is no longer
explosion-proof.
!
WARNING: Before disassembling the union nut and blanking plug, make sure the area is non-
hazardous.
To connect a PC or laptop to the communications adapter, perform the following steps:
1. Unscrew the union nut to expose the connector socket shown in Figure A.4, page A-3. (A blanking plug will
be removed with the union nut. Store the union nut and blanking plug in a safe place. They will need to be
reinstalled when the adapter is not in use.)
2. Wire the plug connector to an RS-485 converter cable, if it is not already attached (Figure A.5).
3. Insert the plug connector into the adapter socket.
4. Connect the converter cable to the PC or laptop.