查看“MITX-6948-COM”的源代码

[[文件:MITX-6948-COM.jpg|600px|缩略图|MITX-6948-COM]]
===== COM-3456 引脚定义 =====
{| class="wikitable"
|-
! 信号名称 !! Pin !! Pin !! 信号名称 
|-
| DCD#3 || 1 || 2 || DCR#3
|-
|SIN3  || 3 || 4 || RTS#3
|-
| SOUT3 || 5 || 6 || CTS#3
|-
| DTR#3 || 7 || 8 || RI#3
|-
| GND || 9 || 10 || GND
|-
| DCD#4 || 11 || 12 || DCR#4
|-
| SIN4|| 13 || 14 || RTS#4
|-
| SOUT4 || 15 || 16 || CTS#4
|-
| DTR#4 || 17 || 18 || RI#4
|-
| GND || 19 || 20 || GND
|-
| DCD#5 || 21 || 22 || DCR#5
|-
| SIN5 || 23 || 24 || RTS#5
|-
|  SOUT5|| 25 || 26 || CTS#5
|-
| DTR#5 || 27 || 28 || RI#5
|-
| GND || 29 || 30 || GND
|-
| DCD#6 || 31 || 32 || DCR#6
|-
| SIN6 || 33 || 34 || RTS#6
|-
| SOUT6 || 35 || 36 || CTS#6
|-
| DTR#6 || 37 || 38 || RI#6
|-
| GND || 39 || 40 ||  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:MITX-6948-COM.jpg|300px|缩略图|MITX-6948-COM]]
-->
:{| 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 ||
|-
|  J2 || 1-3,2-4 || J2 || 3-5,4-6 || J2 ||3-5,4-6 
|-
|   J3 || 1-2 || J3 || 3-4|| J3 ||5-6
|}

====== 当 COM2 设置为 RS232 时,主板插针定义 ======
{| class="wikitable"
|-
! Pin !! 信号名称 
|-
| 1 ||  DCD#
|-
| 2 || SIN
|-
| 3 ||  SOUT
|-
| 4 ||  DTR#
|-
| 5 ||  GND
|-
| 6 || DSR#
|-
| 7 ||  RTS#
|-
| 8 || CTS#
|-
| 9 ||  RI
|}

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

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