2.3.6 Wiring the signal connections
Complete the following steps to make the signal
connections to terminal blocks TB1 and TB2:
1. Install a cable clamp or gland in one of the 3/4” conduit
holes.
CAUTION!
Be sure to plug the unused conduit hole to
maintain the designated weatherproof or
explosion-proof rating.
2. Route the 4-wire and 3-wire (if used) cables through
the cable clamp. Then, tighten the clamp to secure the
cable(s).
3. Unplug the TB1 and TB2 connectors by pulling them
straight off the printed circuit board, and loosen the
screws on the side of the connectors.
4. Connect the 24 VDC input power leads as follows:
CAUTION!
Connecting the +24 VDC (red) lead to any
terminal except TB1-1 will damage the XMO2.
a. Insert the 4-wire cable +24 VDC line (red) lead into pin
TB1-1 and tighten the screw.
b. Insert the 4-wire cable 24 VDC return (black) lead into
pin TB1-2 and tighten the screw.
5. Connect the 4-20 mA analog output leads as follows:
a. Insert the 4-wire cable + 4-20 mA (white) lead into pin
TB1-3 and tighten the screw.
b. Insert the 4-wire cable – 4-20 mA (green) lead into pin
TB1-4 and tighten the screw.
6. Connect the optional RS232 digital output leads as
follows:
a. Insert the 3-wire cable RX (red) lead into pin TB2-1 and
tighten the screw.
b. Insert the 3-wire cable TX (white) lead into pin TB2-2 and
tighten the screw.
c. Insert the 3-wire cable GND (green) lead into pin TB2-3
and tighten the screw.
7. Carefully plug the TB1 and TB2 connectors back onto
the printed circuit board, and reinstall the cover on the
XMO2.
8. Connect the other ends of the cables to the 24 VDC
power supply, the 4-20 mA input of the display/control
device, and the serial port of the computer or terminal
(see the instruction manuals for those devices for
details).
2.4 Establishing the RS232
communication link
Before the XMO2 can be programmed, a link between the
built-in RS232 digital output and a computer terminal must
be established. To accomplish this, proceed as follows:
Note: See Panametrics document EIA-RS Serial
Communications (916-054) for a details of the RS232
standard
1. Verify that either Com 1 or Com 2 on the computer is
unused.
IMPORTANT:
Do not use a virtual Com port, such as Com 3 or Com 4, for
communicating with the XMO2.
2. With both the XMO2 and the computer turned OFF,
connect a serial cable from the XMO2 to the PC. See
Chapter 2, Installation, for detailed instructions.
CAUTION!
Never make any connections to a computer
while it is powered up. Damage to the system
may result.
3. Power up the PC and launch the IDM software.
Note: See the IDM User’s Manual (910-185) for
information on installing and launching your program.
4. In the Global menu of IDM, select the Preferences option
to specify the com port to which your XMO2 has been
connected.
5. For proper communications with the XMO2, the following
com port settings must be specified:
• Baud Rate = 9600
• Data Bits = 8
• Parity = None
• Stop Bits = 1
• Flow Control = Xon/Xoff
6. Select the Connect to a New Instrument option, enter
the XMO2 ID number (1 to 254), and select OK.
11
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