I have some USB boxes made by Pearl(e?) that have 8 DB9 ports. They work fi=
ne.

Joe

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 Carl Denk
Sent: 29 November 2012 13:18
To: Microcontroller discussion list - Public.
Subject: Re: [EE] RS232 Switch Box. Ideas are welcome!

There are numerous RS-232 cards in both PCI and PCI-E varieties available. =
Try http://www.startech.com/Cards-Adapters/Serial-Cards-Adapters
The 8 port is kind of pricey, but several 2 or 4 port should do the job als=
o. I have a Microchip C2SBC-Q AT motherboard with 4 RS-232 ports (one out t=
he back, and 3 on board headers with a 2 port PCI card, both Linux (Ubuntu)=
, XP Pro SP3, and Windows 8 recognize all the ports.


On 11/29/2012 7:13 AM, Henrique Ribeiro de Oliveira wrote:
> Hello
>
> We have 6 CNC lathes here that use RS232 to download/upload programs=20
> into the server.
> I was planning on making a RS232 Switch Box and leave all the machines=20
> connected.
>
> Searching on the google I found a Analog Switch that can handle +-15V.
> (DG211)
>
> Datasheet  - =20
> http://www.datasheetcatalog.org/datasheet/intersil/fn3118.pdf
>
>
> The CNC RS232 is on a DB25 port that has 13 wires but it can be=20
> simplified to a DB9. I'm not sure how many I/Os I need, on the worst case=
 is 8.
> So 2 x DG211 for each machine and maybe a microcontroler to control=20
> everything.
>
>
> Tryed to find a cheap version of it but all models that I found does=20
> not have enough ports.
>
> Anyone already did something like this before? Can be done like that?
>
>
> Thanks,
>
> Henrique

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