EMB-4500-COM
来自ARM Wiki
COM1、COM3、COM4、COM5:引脚定义
| 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:
| COM2 AS RS232 PORT |
COM2 AS RS422 PORT |
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
| 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
| 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
| Pin# |
RS485
|
| 1 |
TX-
|
| 2 |
NC
|
| 3 |
TX+
|
| 4 |
NC
|
| 5 |
NC
|
| 6 |
NC
|
| 7 |
NC
|
| 8 |
NC
|
| 9 |
GND
|
| 10 |
GND
|
