EUD-2016026-00 Rev.2, SmartScanIS User’s Guide for Union Pacific, 14 January 2021
65
For
RS422
four-wire communications:
Install U8 (MAX489) chip
Install U7 (MAX232) chip
Short jumper J5
Do not short jumpers J1 and J2
Remove RS232 cable from plug P9
Connect RS422 wiring to terminal block
TB3
For
RS485
two-wire communications:
Install U8 (MAX489) chip
Install U7 (MAX232) chip
Short jumper J5
Short jumpers J1 and J2
Remove RS232 cable from plug P9
Connect RS485 wiring to terminal block
TB3
The table below shows the pinout of plug
P9
.
Pin 1
Not Used
Pin 2
RX
Pin 3
TX
Pin 4
Not Used
Pin 5
Ground
Pin 6
Not Used
Pin 7
RTS
Pin 8
CTS
Pin 9
RI
4.6.1.16 Jumpers J1 and J2
When COM1-P9 is configured for
RS485
, both jumpers J1 and J2 should be shorted, which is
how they come from the factory. For
RS422
, they should not be shorted. For
RS232
, jumpers
J1 and J2 have no effect.
4.6.1.17 Jumpers J4 and J5
For
RS232
communications, short jumper J4 and don't short J5. For
RS422
four-wire
communication and for
RS485
two-wire communications, short jumper J5 and don't short J4.
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