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连线定义
上两图均为母头俯视图
9针母头管脚定义:
| 管脚号 | 管脚中英文名 |
|---|---|
| 1 | Data Carrier Detect 数据载波检测 |
| 2 | Receive Data 接收数据 |
| 3 | Transmit Data 发送数据 |
| 4 | Data Terminal Ready 数据终端就绪 |
| 5 | System Ground 信号地 |
| 6 | Data Set Ready 数据设备就绪 |
| 7 | Request to Send 请求发送 |
| 8 | Clear to Send 清除发送 |
| 管脚号 | 管脚中英文名 |
|---|---|
| 2 | Transmit Data 发送数据 |
| 3 | Receive Data 接收数据 |
| 4 | Request to Send 请求发送 |
| 5 | Clear to Send 清除发送 |
| 6 | Data Set Ready 数据设备就绪 |
| 7 | System Ground 信号地 |
| 8 | Data Carrier Detect 数据载波检测 |
| 20 | Data Terminal Ready 数据终端就绪 |
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引脚定义 当连接一头为9针母插头而一头为25针时母插头时,线路连接应该为:| D-Sub 9 | D-Sub 25 | ||
|---|---|---|---|
| Data Carrier Detect | 1 | 4+5 | Request to Send+Clear to Send |
| Receive Data | 2 | 2 | Transmit Data |
| Transmit Data | 3 | 3 | Receive Data |
| Data Terminal Ready | 4 | 6 | Data Set Ready |
| System Ground | 5 | 7 | System Ground |
| Request to Send+Clear to Send | 7+8 | 8 | Data Carrier Detect |
| Data Set Ready | 6 | 20 | Data Terminal Ready |
| RI | 9 | 9 | RI |
当连接两头均为9针母插头时,线路连接应该为:
| D-Sub 9 | D-Sub 9 | ||
|---|---|---|---|
| Carrier Detect | 1 | 7+8 | Request to Send+Clear to Send |
| Receive Data | 2 | 3 | Transmit Data |
| Transmit Data | 3 | 2 | Receive Data |
| Data Terminal Ready | 4 | 6 | Data Set Ready |
| System Ground | 5 | 5 | System Ground |
| Data Set Ready | 6 | 4 | Data Terminal Ready |
| Request to Send+Clear to Send | 7+8 | 1 | Carrier Detect |
| RI | 9 | 9 | RI |
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备注:NC表示另外一头对应的针脚自己连接
另外为了保证串口物理上可以正常工作,可以通过使用制作堵头来测试该口是否正常:
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将堵头插入到要测试的串口上,然后按照下面的netterm设置,连接以后,在netterm输入字符,若屏幕上显示了输入的字符,则说明该串口物理正常。CopyRight owned by the original author.--(www.MegaEntry.com)
其中 调制解调器设置参数为: port(端口):COM1(或COM2 取决于连接线连接在哪个端口上) Baud Rate(波特率):9600 Data Bits(资料位):8 Parity(奇偶):None(无) Stop Bits(停止位):1CopyRight owned by the original author.--(www.MegaEntry.com)
Maxium Connect(拨接时最长等待时间):60 控制部分设置中:只有 Direct Line使能(也就是在check box中打上对号,其他的都不选) 其他参数保持缺省不要修改 二、linux环境下Mgetty设置说明: 首先需要安装Mgetty软件包,在Redhat的光盘中有该软件的RPM包只需要在该RPM包所在目录下运行:MegaEntry - Social networking and discussion site!
rpm -ivh mgetty-1.1.3-i386.rpm 即可 其中需要修改的设置为: 在/etc/目录下的 inittab 配置文件最后加如一行如下: S0:345:respawn:/sbin/mgetty -r -x 9 ttyS1CopyRight owned by the original author.--(www.MegaEntry.com)
其中最后一个参数ttyS1应该根据你连接的linux机器哪个端口来决定,若连接到com1则应该将该参数修改为ttyS0 若为COM2则应该为ttyS1 另外在/etc/mgetty-sendfax目录下有mgetty.config文件: 内容应该为: ## mgetty configuration fileMegaEntry - Social networking and discussion site!
## this is a sample configuration file, see mgetty.info for details## comment lines start with a "# ", empty lines are ignoredMegaEntry - Social networking and discussion site!
# ----- global section -----## In this section, you put the global defaults, per-port stuff is below# set the global debug level to "4 " (default from policy.h)CopyRight owned by the original author.--(www.MegaEntry.com)
debug 9# access the modem(s) with 38400 bpsspeed 9600MegaEntry - Social networking and discussion site!
port ttyS1direct yes其中若你连接到inux机器的com1口的话,则需要将
port ttyS1
修改为
port ttyS0
其他保持不变
注:其中mgetty程序的log文件为/var/log/目录下的mget*文件,可以查看该文件来判断问题所在