
11921015 Rev A 6 © 2013 UTC RETAIL.
All rights reserved.
COM Ports
There are 4 COM ports on the 2170; they are standard RS-232.The COM3 and COM4 ports
have been configured to supply +5VDC power to pin 9 of their DB9 connector. COM3 and
COM4 may supply up to 0.5A of current; do not exceed this limit.
Note: COM3 and COM4 may also be configured for pin 9 to be RI (ring indicator) or to
supply +12V 0.5A. This configuration must be performed at the UTC RETAIL facility.
The table below summarizes the RS232 DB9 pin definitions:
Signal CD RX TX DTR GND DSR RTS CTS
RI or 5V/12V
output
(as
explained
above)
Use the supplied RJ48 – DB9 adapter cables to connect to the COM ports. Additional cables
are available as P/N 11801015. See the drawing below for the adapter’s pinout.
Figure 1, Serial Port Adapter Pinout
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