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2.1.2 CONNECTING THE SERIAL PRINTER, REMOTE DISPLAY OR COMPUTER
The S750 series indicator comes standard with two serial ports, designated COM1 and COM2.
COM1 is a full duplex, RS-232 port designed for connection to either a PC or a
serial printer. COM2 is a simplex, RS-232 / Passive 20 mA Current Loop port
designed for connection to a remote display.
For indicators housed in an ABS enclosure, both COM ports are wired to one physical connector,
a DSUB9 female. As a result, you must use a "Y" interface cable (not included) to
gain access to COM2. Figure 2-4 shows the serial port pinout. Refer to Appendix B
for some suggested cable diagrams. (A 9-pin pin Male D-type connector is
required).
1. Plug the serial printer or computer communication cable (not included) directly into the
DSUB9 serial port connector or into the port labeled COM1 on the "Y" interface cable.
2. Plug the remote display cable (not included) directly into the port labeled COM2 on the
"Y" interface cable.
Pin No.
2
3
4
5
7
8
Figure 2-4: Pin assignments for the DSUB9 serial port connector
2.1.3 CONNECTING THE POWER SUPPLY
1. The indicator ships standard with an internal AC to DC adapter. Simply plug the AC line
cord into a standard wall outlet.
2. If the indicator was shipped with the optional external AC adapter, simply plug the AC
adapter into the indicator's DC Power Jack first, and then plug into a standard wall
outlet. Make sure that the AC voltage appearing at the wall outlet matches the
input voltage marked on the AC adapter.
Pin Name
Port
Signal Level
Receive Data
COM1
RS-232
Transmit Data
COM1
RS-232
Transmit Data
COM2
RS-232
Signal Ground
Both
RS-232
CL +
COM2
20 mA
CL –
COM2
20 mA
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