查看“EMB-3700-COM”的源代码

===== COM1接口定义 =====
{| 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接口定义 =====
{| 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RS485/RS422/ RS232时，其管脚定义分别如下
{| class="wikitable"
|-
! RS485 !! RS422 !! RS232 |管脚 || RS232 !! RS422 !! RS485
|-
| DATA- || TX- || DCD || 1 || 2 || DSR || NC || NC
|-
| DATA+ || TX+ || RXD || 3 || 4 || RTS || NC || NC
|-
| NC || RX+ || TXD || 5 || 6 || CTS || NC || NC
|-
| NC || RX- || DTR || 7 || 8 || RI || NC || NC
|-
| GND || GND || GND || 9 || 10 || GND || GND || GND
|}


====== COM2 跳线功能设置(J1、J2、J3) ======
:(J1, J2,J3)跳线用来设置 COM2 的传输模式, COM2 支持 RS232/RS422/RS485 三种传输模式,您可以根据您自身的需求来选择设置,默认传输模式为 RS232。
::'''J1、J2、J3:'''
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[[文件:EMB-3700-COM.jpg|300px|缩略图|EMB-3700-COM]]
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:{| class="wikitable"
|-
|colspan=2|COM2 AS RS232 PORT ||colspan=2|COM2 AS RS422 PORT ||colspan=2|COM2 AS 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
|}