Debugging
· 22 ·
PPC-1781
USB2.0 standard port (USB3/4)
Pin
Signal Name
1 +5V
2 USB_Data-
3 U
USB3, USB4
4 GND
5.2.7 Standard DB9 Port
The PC provides 6 COM ports. COM1
~
COM6 support RS-232/RS-422/RS-485
modes (please refer to BIOS Setup for modification mode). Their pin definitions are
as follows:
Signal Name
Pin
RS-232
(Default)
RS-422
RS-485
1 DCD# TXN DATA-
2 RXD TXP
DATA+
3 TXD RXP NC
4 DTR# RXN NC
5 GND GND GND
6 DSR# NC NC
7 RTS# NC NC
8 CTS# NC NC
COM1
~
COM6
9 RI# NC NC
Note: under the RS-485 mode, the data receiving/sending direction of COM1
~
COM6 is controlled by RTS.