Arbor Technology EmModule-621E, Manual

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Installation
JRS1: COM2 RS-232/422/485 Selection (6)
The onboard COM2 port can be configured to operate in RS-422 or RS-485
modes. RS-422 modes differ in the way RX/TX is being handled. Jumper
JRS1 switches between RS-232 or RS-422/48 mode. When JRS1 is set to
RS-422 or RS-48 mode, there will be only +12V output let while JRS1 is set.
All RS-232/422/482 modes are available on COM2.
It can be configured COM2 to operate in RS-232, RS-422 or RS-485 mode
Connector type: 2.00mm pitch 2x3-pin headers.
Mode RS-232 (Default) RS-422 RS-485
1-2 ON OFF OFF
3-4 OFF ON OFF
-6 OFF OFF ON
6 5
2 1
6 5
2 1
6 5
2 1
Jumpers