查看“EMB-3930-COM”的源代码

[[文件:EMB-3930 COM1，COM2，COM3-4.jpg|600px|缩略图|EMB-3930 COM1，COM2，COM3-4]]
===== COM-1： =====
{| 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
|}

===== COM-2： =====
{| 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
|}

===== COM-3-4： =====
{| 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
|}

===== COM2引脚定义 =====
====== 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:'''
<!--
[[文件:EMB-39308-COM.jpg|300px|缩略图|MITX-6948-COM]]
-->
:{| class="wikitable"
|-
! colspan=2|COM2  RS232（默认） !! colspan=2|COM2  RS422    !! colspan=2|COM2  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 || 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
|-
|}