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Wireless RS232

I'd like to accomplish wireless RS232 between two computers running hyperterminal or procom without any additional software/programming, using the standard com ports (DB9). Once again I'm Googled out. At first I thought I could splice into a pair of FRS two-way radios, still thinking about it but some sites said those frequencies are for voice only and I'd be violating FCC rules. Still, seems I should be able to turn my RS232 pulses into something broadcastable over these radios and then decipher the received tones at the othere end into RS232 pulses, waalaa! Another thought is to build from off the shelf components such as something like: Computer #1's com port

1."Serial to USB" adapter >>> $19.00 2."USB to Ethernet" adapter >>> $27.00
  1. Ethernet Wireless Access point or adapter >>> .00

Then Computer #2 has the same. There's probably some protocol I'd have to put at the beginning of my ASCII file transfer to address the receiving wireless adaptor to know its being addressed, yes? Am I wasting my energy? Can I direct my energy in another direction to accomplish my goal of sending ASCII files wirelessly? My goal is to eventually send ASCII files wirelessly to "dummy terminals" (CNC machines) that you simply set its RS232 to receive and it will swallow anything ASCII coming in its DB9 com port socket. Any thoughts/ideas/opinions greatly appreciated Thanks in advance, Bart

Reply to
Bart
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Which OS? If you are running XP why not a wireless network? If they are industrial, some sort of RS-485?

Reply to
Homer J Simpson

Thanks for replying Homer, Wireless RS-485? I've seen RS232 to RS485 converters but not sure how this comes into play with my dilemma. The "dummy" terminals are of a PLC nature, only configurable to the extent of Baud, Data, Stop bits and thats it.....no way to add software or switch operating systems. They will Send ASCII files and they will Receive ASCII files and I'm hoping to do this wirelessly....somehow, from my laptop. Bart

Reply to
Bart

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might be a start.

Reply to
Homer J Simpson

Plenty of off-the-shelf wireless RS232 solutions are available, some work a lot better than others depending upon your application. Most of them are completely transparent, no need to set them up at all in many cases, and no drivers or anything else required. They literally are a "wireless RS232 cable".

This brand is the ducks guts, have worked for me on short packet streams when other brands have not:

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I can't believe you didn't find anything on Google, "wireless rs232" gets plenty of options.

Blue tooth ones like this are very popular if range is short:

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I've had some brands fail because some of them will only send a "packat" once it has received enough bytes to fill it, so if you only send a byte or two it just sits there stupid until it gets enough data to send.

Dave :)

Reply to
David L. Jones

You may want to check some of the RF modules from the below makers.

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Reply to
Si Ballenger

I would recommend the LPRS EasyRadio modules, just connect them to 5V, and a MAX232 if needed, and you have wireless RS232. They are made in the UK, but

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distribute them in the US.

They either transmit after 180bytes, or when a 2byte gap is detected. Simply use serial in/out.

Reply to
Ben Wheare

Thanks for the replies! The links I clicked on from a Google search seemed units were all over $200 a piece, some $400 and $600....but as I took the time to surf the links you supplied I find some around $100 and modules as low as $20...........COOL! Seems I need more patience with Google and should take time to surf a sight that it suggests instead of just the page it takes me to. I was impressed with Maxstream's site, gonna call them today. Thanks again, Bart

Reply to
Bart

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