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RS232 Chip help

 
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excentric
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Joined: 28 Nov 2008
Posts: 2

PostPosted: Fri Nov 28, 2008 12:55 pm    Post subject: RS232 Chip help Reply with quote

I am currently rewiring an touch window that was designed for a mac to work with pc. not really a big challenge seeing how once i got it apart the board inside the device is wired to work with a serial input. what i am having a hard time figuring out is i have to add a resistor to the board and i have to make sure i have the correct wiring to the serial decoder.
The chip model is MAX232CPE. i have the spec sheet for it. I am just having a hard time looking at it. i haven't done electronics in about 3 years. Any help would be apreciated.
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Nov 28, 2008 7:41 pm    Post subject: Re: RS232 Chip help Reply with quote

excentric wrote:
I am currently rewiring an touch window that was designed for a mac to work with pc. not really a big challenge seeing how once i got it apart the board inside the device is wired to work with a serial input. what i am having a hard time figuring out is i have to add a resistor to the board and i have to make sure i have the correct wiring to the serial decoder.
The chip model is MAX232CPE. i have the spec sheet for it. I am just having a hard time looking at it. i haven't done electronics in about 3 years. Any help would be apreciated.


Hi excentric,

Welcome to the forum. I will try to understand the question to give you a good answer.

The touch window (same as a touch pad?) was designed for and operates correctly on a Mac. From what I remember the Mac serial connector is not the standard DB9 connector as it is with a normal PC. I assume that the company makes (or you have created) drivers for this device for a PC.

I am not sure why circuit modifications are needed? I would assume you would just need to use an adapter cable?
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excentric
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Joined: 28 Nov 2008
Posts: 2

PostPosted: Sat Nov 29, 2008 1:30 pm    Post subject: Reply with quote

Well i am wiring it to work with a serial out. Once i get that working my goal is to make it ps2. The main reason i am messing with this is to try and relearn some things i have forgotten. here is a link to the screen its self.
http://www.synapseadaptive.com/edmark/prod/tw/default.htm
might make it easier to understand what it is. The new versions of it have usb capabilities. I do have PC drivers for it. i am not concerned so much any more on the resistor. than i am and info on to chip of advice. i have already rewired the one on my own with little success , my pc does not see it. So i am back to re- science out the circuit layout. i will draw a schematic of it sometime this weekend i think just so i have a better reference.
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Sat Nov 29, 2008 4:06 pm    Post subject: Reply with quote

Sounds like a complex project.

Here is some information that may help.
http://pinouts.ru/InputCables/MousePs2Serial_pinout.shtml

http://www.gedanken.demon.co.uk/rs232-converters/ps2.html




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