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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
11.1 Serial Ports; RS232 Devices
There are two serial ports on the System Interface board that connect the SmartScanIS to
RS232 devices. They are labeled P8 and P10 on the board. P10 is COM2 and P8 is COM3.
COM1 functions as the conduit for communications with RS485 devices and is configured for
this protocol when systems are shipped. If anything is connected to this port, you can't just
unplug it to free up a spot for your laptop. Other modifications have to be made to the system
to let COM1 connect to RS232 devices.
The figure below shows the location of COM2 and COM3.
The table below lists the normal functions for which each of these COM ports is used.
Port
Use
COM2
Union Pacific's Polling System
COM3
Laptop Computer
The table below lists what is normally plugged into each of these COM ports.
Type of Polling System
COM2
COM3
No Polling System
nothing
Modem
RFL Polling System
RFL
Modem
Dialup Polling System
Modem
nothing
Status LEDs
TB3
COM3
COM2
Status LEDs
TB3
COM3
COM2
Summary of Contents for SmartScanIS
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