User manual

A-5
MC-III™ EXP Flow Analyzer Appendix A
Disconnecting the Communications Adapter
To disconnect the adapter, perform the following steps:
1. Remove the plug connector (with converter cable attached) from the socket.
2. Place the blanking plug inside the union nut (removed in step 1).
3. Screw the union nut onto the union half to cover the socket. Hand-tighten to ensure a snug connection.
Important: Do not disconnect the plug connector from the RS-232 to RS-485 converter cable when it
is not in use. For best results, store the plug connector with the converter cable.
Installation of Adapter (when purchased separately from an MC-III EXP)
!
WARNING: If the communications adapter is ordered separately from the MC-III EXP Flow Ana-
lyzer, the conduit openings in the enclosure will be sealed with brass or stainless steel plugs.
Do not remove the plug from the enclosure to install the adapter unless the area is known to be
non-hazardous.
To install a communications adapter purchased separately from an MC-III EXP, perform the following steps:
1. Thread the cable of the adapter through a conduit opening in the instrument housing and screw the adapter
into place.
2. Connect the adapter cable to the RS-485 port on the MC-III EXP main circuit board (Figure A.6).
3. Connect the plug connector to an RS-485 converter cable (Figure A.5, page A-4) if applicable.
Red
Black
TB1
PULSE
INPUT
RESET
INPUT
TFM
A&S
GND
T
B
3
EXT POWER
TB2
RS485
SLAVE
4-20
OUT
PULSE
OUT
6
-
3
0
V
D
C
Communications
Adapter
J1
J2
RESET
SWITCH
BATTERY
Figure A.6—Circuit board connection for communications adapter