查看“MITX-6975-COM”的源代码

[[文件:MITX-6975 COM.PNG|600px|缩略图|MITX-6975 COM]]
===== COM1: =====
[[文件:EMB-3930-HDMI.jpg|500px|缩略图|MITX-6948-HDMI]]
::{| class="wikitable"
|-
! Pin# !!信号名称 
|-
| 1 || DCD
|-
| 2 || RXD
|-
| 3 || TXD
|-
| 4 || DTR
|-
| 5 || GND
|-
| 6 || DSR
|-
| 7 || RTS
|-
| 8 || CTS
|-
| 9 || RI
|}

'''COM2:'''
::{| class="wikitable"
|-
! 信号名称 !! Pin# !! Pin# !! 信号名称
|-
| DCD || 1 || 2 || DSR
|-
| SIN || 3 || 4 || RTS
|-
| SOUT || 5 || 6 || CTS
|-
| DTR || 7 || 8 || RI
|-
| GND || 9 || 10 || GND
|}
* 当COM2设置为RS232/RS422/RS485时，其管脚定义如下：
::{| class="wikitable"
|-
! 信号名称 !! RS232（默认） !! RS422 !! RS485
|-
| 1 || DCD || TX- || DATA-
|-
| 2 || DSR || NC || NC
|-
| 3 || RXD || TX+ || DATA+
|-
| 4 || RTS || NC || NC
|-
| 5 || TXD || RX+ || NC
|-
| 6 || CTS || NC || NC
|-
| 7 || DTR || RX- || NC
|-
| 8 || RI || NC || NC
|-
| 9 || GND || GND || GND
|-
| 10 || GND || GND || GND
|}

'''COM3-4:'''
::{| class="wikitable"
|-
! 信号名称 !! Pin# !! Pin# !! 信号名称
|-
| HDCD3 || 1 || 2 || HDSR3
|-
| HRXD3 || 3 || 4 || HRTS3
|-
| HTXD3 || 5 || 6 || HCTS3
|-
| HDTR3 || 7 || 8 || HRI3
|-
| GND || 9 || 10 || GND
|-
| HDCD4 || 11 || 12 || HDSR4
|-
| HRXD4 || 13 || 14 || HRTS4
|-
| HTXD4 || 15 || 16 || HCTS4
|-
| HDTR4 || 17 || 18 || HRI4
|-
| GND || 19 || 20 || GND
|}