E m b e d d e d C o n t r o l l e r A E C - 6 9 1 3Chapter 2 Hardware Installation 2 - 103 TXD 4 DTR5 GND 6 DSR7 RTS 8 CTS9 RI2.19 RS-232 Header (COM3)4BPin 2 5 B Signal Pin 5 B Signal1 DCD 2 RXD3 TXD 4 DTR5 GND 6 DSR7 RTS 8 CTS9 RI2.20 RS-232 Header (COM4)4BPin 2 5 B Signal Pin 5 B Signal1 DCD 2 RXD3 TXD 4 DTR5 GND 6 DSR7 RTS 8 CTS9 RI2.21 RS-232 Header (COM5)4BPin 2 5 B Signal Pin 5 B Signal1 DCD 2 RXD3 TXD 4 DTR5 GND 6 DSR7 RTS 8 CTS9 RI