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Coding for hardware communication via RJ11

I have a Panasonic video surveillance multiplexer that has a data input (RJ11) that allows for a controller unit to send commands for various functions ex. Select Cam, Pan, Tilt, Zoom. I'm an experienced .NET/Java developer but haven't ever done any work with hardware communication.

Can anyone share some links or knowledge on how i'd go about doing something like this?

I think my biggest hurdle will be figuring out what type of commands i need to send the unit to carry out the various tasks.

I've thought about taking the unit apart and making my own controller piece to wire directly into the buttons that manually control unit.
1 Solution
Todd GerbertIT ConsultantCommented:
Well, I'll assume that RJ11 port is an RS-232 serial port.  You may have, or need, an adapter to connect it to the DB-9 serial port on your computer.

Here's an article discussing serial port programming: http://www.dreamincode.net/forums/showtopic35775.htm
And the MSDN documentation on the .Net SerialPort class: http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.aspx

As for what commands to send your hardware, that'll depend entirely on the hardware manufacturer. No documentation with it?
used2couldAuthor Commented:
Thanks for the articles. I know my question was pretty vague.
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