Manual

Embedded Box TKS-G21-QM77B
Chapter 2 Quick Installation Guide 2-23
2.12 COM Port #2 RS-232/422/485 Selection (CN11)
COM2 RS-232/422/485 selection for AAEON TKS series is set in BIOS setting
as following:
Entering BIOS Setting Menu: Choose "Advanced  Super IO Configuration
 Serial Port 2 Configuration". (Default setting is at "RS-232")
Different devices implement the RS-232/422/485 standard in different ways. If
you have problems with a serial device, check the pin assignments below for
the connector.
RS-232 Mode
Pin Signal Pin Signal
1 DCDB 2 DSRB
3 RXB 4 RTSB
5 TXB 6 CTSB
7 DTRB 8 RIB
9 Ground 10 N/C
RS-422 Mode
Pin Signal Pin Signal
1 TXD- 2 N/C