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What connectors for the COM ports for RS232£
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HammyHavoc View Drop Down
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    Posted: 06 Dec 2023 at 8:40am
Photo here: https://www.reddit.com/r/electronics/s/Dve2zeqB6Q
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Xaltar View Drop Down
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Points: 22793 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2023 at 9:39pm
Any of the ports marked "COM" will work for RS232 as far as I am aware. By that
I mean both 9 and 25 pin ports. AFAIK the ports exist on these boards specifically
to provide legacy RS232 support for various industrial and commercial devices.
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Points: 50 		Post Options Post Options   Thanks (1) Thanks(1)   Quote HammyHavoc Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2023 at 9:43pm
Originally posted by Xaltar Xaltar wrote:

Any of the ports marked "COM" will work for RS232 as far as I am aware. By that
I mean both 9 and 25 pin ports. AFAIK the ports exist on these boards specifically
to provide legacy RS232 support for various industrial and commercial devices.


The question was about connectors for the motherboard headers themselves as they're completely non-standard at 2mm pitch (they don't follow the IDE standard), ergo the average baffle and its accompanying cable won't fit due to the connector being wrong.

Weirdly though, the LPT header is the standard 2.54mm pitch. Go figure.

FWIW, if anybody else wants this information, they're Chyao Shiunn JS-2008A-2.
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Points: 22793 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 07 Dec 2023 at 6:13am
Thanks for sharing the info, I didn't notice that based on the pics but now that
you mention it, I can see what you mean. I wonder why they went that route...
Ensuring compatibility with an autosense function perhaps or maybe just to differentiate
between USB headers and COM headers. Regardless of the connector, it should still
be compatible with standard RS232 devices.

I am glad you found the info you were looking for. Workstation/server boards often
have oddities like this.

Edited by Xaltar - 07 Dec 2023 at 6:13am
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