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I am trying to learn the maximum number of serial ports that can be configured on Windows 7. Any information on this will be greatly appreciated. I'm having trouble finding this.

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migrated from serverfault.com Oct 31 '12 at 1:37

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How many do you really need? –  Zoredache Oct 30 '12 at 17:05
    
We need to connect around 80 devices. –  Rob Oct 30 '12 at 17:26
    
What kind of devices? Perhaps RS485 would be a better alternative. –  Chris S Oct 30 '12 at 17:27
    
Unfortunately I am locked in to RS-232 due to hardware limitations. We are planning to proxy the serial port via Ethernet using third-party hardware. We are in the planning stages and I couldn't find the maximum number of ports I could configure. –  Rob Oct 30 '12 at 17:32

1 Answer 1

up vote 3 down vote accepted

Windows 6.0+ support 256 Communications Port devices.

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Thank you for the information. That's more than we'll need. Where did you get this information? I will need a reference in my documentation. –  Rob Oct 30 '12 at 17:36
    
Honestly I don't know where or if MS has this documented. It's a definitely the current limit however. –  Chris S Oct 30 '12 at 19:27
    
Windows has supported 256 ports since Windows 95, at least according to the API documentation. –  John Gardeniers Oct 30 '12 at 19:31
    
@JohnGardeniers I think that's only for 32-bit apps; IIRC 16-bit are limited to 9... Do you have a link to something official looking? I couldn't find anything. –  Chris S Oct 30 '12 at 20:53
    
You may be right. I don't have any references to hand but recall that I looked up the information when I was writing a comms program for Win95, which was obviously a few years ago. –  John Gardeniers Oct 30 '12 at 23:08

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