查看“EMB-4500-COM”的源代码

[[文件:EMB-4500-COM1-3-4-5.jpg|500px|缩略图|EMB-4500-COM1-3-4-5]]
===== COM1、COM3、COM4、COM5:引脚定义 =====
{| class="wikitable"
|-
!   信号名称!! Pin# !!Pin# !! 信号名称
|-
| NC||1||2|| NC
|-
|   COM_RXD||3 ||  4 || COM_RTS#
|-
|   COM_TXD||5 ||  6 || COM_CTS#
|-
| NC||7||8|| NC
|-
|  GND ||9||10 || 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:'''
::{| 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
|}

====== 当 COM2 设置为 RS232 时,主板插针定义 ======
{| class="wikitable"
|-
! Pin# !! RS232(默认) 
|-
| 1 || NC
|-
| 2 || NC
|-
| 3 || COM_RXD 
|-
| 4 || COM_RTS# 
|-
| 5 || COM_TXD
|-
| 6 || COM_CTS#  
|-
| 7 ||  NC 
|-
| 8 || NC 
|-
| 9 || GND 
|-
| 10 || GND 
|}

====== 当 COM2 设置为 RS422 时,主板插针定义 ======
{| class="wikitable"
|-
! Pin# !! RS422 
|-
| 1 || TX-
|-
| 2 ||  NC 
|-
| 3 || TX+ 
|-
| 4 || NC 
|-
| 5 ||  RX+ 
|-
| 6 || NC
|-
| 7 ||  RX- 
|-
| 8 || NC 
|-
| 9 || GND 
|-
| 10 ||  GND 
|}

====== 当 COM2 设置为 RS485 时,主板插针定义 ======
{| class="wikitable"
|-
! Pin# !! RS485 
|-
| 1 || TX-
|-
| 2 || NC
|-
| 3 ||  TX+
|-
| 4 ||  NC
|-
| 5 ||  NC
|-
| 6 ||  NC
|-
| 7 ||  NC
|-
| 8 || NC
|-
| 9 || GND
|-
| 10 || GND
|}