查看“ATX-6991 COM”的源代码

[[文件:ATX-6991 COM1，COM2，COM3-COM6，J9.jpg|600px|缩略图|ATX-6991 COM1，COM2，COM3-COM6，J9]]
===== COM1、COM2： =====
{| class="wikitable"
|-
! Pin !! COM1 !! COM2 
|-
| 1 || DCD# || DATA-
|-
| 2 || SIN || DATA+
|-
| 3 || SOUT || HSOUT2RX+
|-
| 4 || DTR# || HDTR#2RX
|-
| 5 || GND || GND
|-
| 6 || DSR# || DSR#
|-
| 7 || RTS# || RTS#
|-
| 8 || CTS# || CTS#
|-
| 9 || RI || RI
|}

===== COM2 跳线功能设置（J1，J2，J3）： =====
:{| class="wikitable"
|-
|colspan=2|COM2  RS232 PORT ||colspan=2|COM2  RS422 PORT   ||colspan=2|COM2  RS485 PORT
|-
| J1 || 1-3  2-4 || J1 || 3-5  4-6 || J1 || 3-5  4-6
|-
| J2 || 1-3  2-4 || J2 || 3-5  4-6 || J2 || 3-5  4-6
|-
| J3 || 1-2 || J3 || 3-4 || J3 || 5-6  7-8
|}

===== 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
|}