查看“MITX-6997 COM”的源代码

[[文件:ATX-6993 COM1，COM2，COM3-COM6，J9.jpg|600px|缩略图|ATX-6993 COM1，COM2，COM3-COM6，J9]]
===== COM1、COM2： =====
{| 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
|}

===== 当COM2设置为R232/RS422/RS485时，COM2 PIN脚定义： =====
{| class="wikitable"
|-
! Pin !! RS232（默认） !! RS422 !! RS485 
|-
| 1 || DCD || TX- || DATA-
|-
| 2 || RXD || TX+ || DATA+
|-
| 3 || TXD || RX+ || NC
|-
| 4 || DTR || RX- || NC
|-
| 5 || GND || GND || GND
|-
| 6 || DSR || NC || NC
|-
| 7 || RTS || NC || NC
|-
| 8 || CTS || NC || NC
|-
| 9 || RI || GND || GND
|}

===== COM3-COM6： =====
{| 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 || COM_PIN10
|}

===== J9： =====
{| class="wikitable"
|-
! Pin !! 信号名称 
|-
| 1 || +5V
|-
| 2 || COM_PIN10
|-
| 3 || +12V
|}