Difference between revisions of "Connect to a modified router"
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| − | + | == Summary == | |
| + | |||
| + | This will explain how to connect to the serial ports on a modified LinkSys WRT54G using serial communication software such as the open source [http://www.columbia.edu/kermit/ Kermit]. | ||
| + | |||
| + | == Before Starting == | ||
| + | |||
| + | === Expose a serial port on the router === | ||
| + | |||
| + | You must have successfully modified a LinkSys WRT54G to expose at least its first serial port in such a way that you can connect it to another machine with serial communications software. If you have not done so yet, please see [[HOWTO:Modify the Linksys hardware]] | ||
| + | |||
| + | === Acquire serial communication software === | ||
| + | |||
| + | A solid open source suite of communication software known as Kermit has served us well as a method of communicating with the WRT54G. C-Kermit, the UNIX compatible implementation, is available for download at their website [http://www.columbia.edu/kermit/ck80.html]. | ||
| + | |||
| + | == Steps to Connect to the Router == | ||
| + | |||
| + | === Task One: Power up the Router === | ||
| + | |||
| + | Yes, that means plug it in. | ||
| + | |||
| + | === Task Two: Connect Serial (& Optionally Network) Cable(s) === | ||
| + | |||
| + | Ensure that the connection is going from UART0 (the first serial port--you ''did'' label them didn't you?) as this is where the console will be running. | ||
| + | |||
| + | Also, because the goal is to upload custom code to the router, it would be a good idea to connect the router to your network by wiring it up via one of the numbered LAN ports on the back of the router (NOT the Internet/WAN port). | ||
| + | |||
| + | === Task Three: Configure your Serial Communication Software === | ||
| + | |||
| + | The connection used by the router's serial port is fairly standard: 115200bps, with 8 data bits, no parity bit, and 1 stop bit, or 8N1. | ||
In our setup, once running Kermit on the external machine, we connected by typing in:<br/> | In our setup, once running Kermit on the external machine, we connected by typing in:<br/> | ||
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|} | |} | ||
| − | Once connected, | + | === Task Four: Connect to the OpenWRT Console === |
| + | |||
| + | In Kermit, after the configuration commands have been entered, it was as easy as typing <code>connect</code>. Once connected, press <code>Enter</code> to get a console from [[OpenWRT]]. This should function just about identically to the ssh console, and if it works correctly, it means that the serial port has been correctly installed. | ||
| + | |||
| + | === Task Five: Access to the Common Firmware Environment CLI === | ||
| + | |||
| − | + | == What to do next? == | |
Revision as of 13:51, 6 March 2007
Summary
This will explain how to connect to the serial ports on a modified LinkSys WRT54G using serial communication software such as the open source Kermit.
Before Starting
Expose a serial port on the router
You must have successfully modified a LinkSys WRT54G to expose at least its first serial port in such a way that you can connect it to another machine with serial communications software. If you have not done so yet, please see HOWTO:Modify the Linksys hardware
Acquire serial communication software
A solid open source suite of communication software known as Kermit has served us well as a method of communicating with the WRT54G. C-Kermit, the UNIX compatible implementation, is available for download at their website [1].
Steps to Connect to the Router
Task One: Power up the Router
Yes, that means plug it in.
Task Two: Connect Serial (& Optionally Network) Cable(s)
Ensure that the connection is going from UART0 (the first serial port--you did label them didn't you?) as this is where the console will be running.
Also, because the goal is to upload custom code to the router, it would be a good idea to connect the router to your network by wiring it up via one of the numbered LAN ports on the back of the router (NOT the Internet/WAN port).
Task Three: Configure your Serial Communication Software
The connection used by the router's serial port is fairly standard: 115200bps, with 8 data bits, no parity bit, and 1 stop bit, or 8N1.
In our setup, once running Kermit on the external machine, we connected by typing in:
set line /dev/tty000
|
to connect to the device talking to the router. | |
set serial 8n1
|
which is not really necessary since this is default. | |
set speed 115200
|
as given to us in the router specifications. |
Task Four: Connect to the OpenWRT Console
In Kermit, after the configuration commands have been entered, it was as easy as typing connect. Once connected, press Enter to get a console from OpenWRT. This should function just about identically to the ssh console, and if it works correctly, it means that the serial port has been correctly installed.
