查看“BPC-7937-COM”的源代码

[[文件:BPC-7937-COM1，COM2.jpg|600px|缩略图|BPC-7937-COM1，COM2]]
===== COM1，COM2： =====
:{| class="wikitable"
|-
! Pin !! 信号名称
|-
| 1 || DCD
|-
| 2 || TXD
|-
| 3 || RXD
|-
| 4 || DTR
|-
| 5 || GND
|-
| 6 || DSR
|-
| 7 || RTS
|-
| 8 || CTS
|-
| 9 || RI
|}

* COM2 跳线功能设置（J1，J2，J3）：
:{| class="wikitable"
|-
! Pin !! RS232（默认） !! Pin !! RS422 !! Pin !! RS485
|-
| 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
|}

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