National Instruments Touch Panel Computer TPC-2012 - Manual (Page 25)

Appendix B Serial Port Settings
TPC-2012/TPC-2512 User Manual B-2 ni.com
COM4 Connector Pinout and Settings
The TPC-2012/TPC-2512 COM4 serial port is adjustable. You can set it to
RS-232, RS-422, or RS-485, and it has auto data flow control capability. In
other words, the TPC-2012/TPC-2512 can automatically detect the data
flow direction at this port when two-wired RS-485 communication is
activated.
The following figure and table show the COM4 pinout and settings.
COM4 Mode S1 and S2 Setting
RS232 Mode
RS485 Mode
RS422 Master Mode
RS422 Slave Mode
1 5
9 6