E m b e d d e d C o n t r o l l e r A E C - 6 6 1 3Chapter 2 Hardware Installation 2 - 112.5 COM Port 1 ConnectorPin Signal Pin Signal1 DCDA 2 RXA3 TXA 4 DTRA5 Ground 6 DSRA7 RTSA 8 CTSA9 RIA2.6 COM Port 2 ConnectorRS-232 ModePin Signal Pin Signal1 DCDB 2 DSRB3 RXB 4 RTSB5 TXB 6 CTSB7 DTRB 8 RIB/+5V/(+12V)9 GroundRS-422 ModePin Signal Pin Signal1 TXD- 2 N/C3 RXD+ 4 N/C5 TXD+ 6 N/C7 RXD- 8 N/C / +5V / (+12V)9 Ground