Author Topic: .NET and access to Modem Control Register - Aux Output 2  (Read 3830 times)

philbert

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.NET and access to Modem Control Register - Aux Output 2
« on: November 29, 2012, 12:58:47 am »
Hi, We are in the process of porting some DOS/C code to Windows-The application is required to set/clear the Aux Output 2 bit on the Modem Control Register. In the DOS code is was a simple task of writing the required byte to the serial port address offset to the MCR. Under Windows I can't see how it can be done, also with the .NET serialport class there doesn't appear to be anyway.

I've googled away and haven't found a lot, mainly only to do with parallel port direct pin access.

Is there anyway to access the MCR from Windows/.NET? is a device driver the only way?

Cheers,
Phil

Jan Axelson

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Re: .NET and access to Modem Control Register - Aux Output 2
« Reply #1 on: November 29, 2012, 11:38:42 am »
I think you would need to use an inpout DLL, which requires knowing the port's address. See:

http://www.janaxelson.com/parport.htm#Programming

Or revise the code so you don't need that bit.
« Last Edit: June 29, 2015, 10:20:59 am by Jan Axelson »