RS232 Development Board

You've asked this question a dozen times at least. If you have not yet received a satisfactory answer then build one.

Get an old PC.

VLV

A PIC16F84 and three MAX3110E. Can't get much cheaper than that.

The question doesn't make sense to me. What would the 3 RS232 ports be connected to?

If you are referring to a low cost MCU development board that has three bi-directional RS232 ports, and allows you to practice RS232 communications with either C or assembly code and also has a series of output LED's for easy debug...then the answer is 'no' I don't know of any.

Thomas

I thought I saw one of the ARM boards at Olimex that has 3 RS232 ports. Some time ago, but go check.

|-----------------------------------------------------------------------| |"ratemonotonic wrote: | | | |> Hi All , | |> | |> Does any one know an off the shelf (and cheap) development board with| |> 3 RS232 ports? | | | |Get an old PC." | |-----------------------------------------------------------------------|

An old PC would have one RS232 port instead of three of them.

An old PC would have ISA, EISA, VLB and/or PCI slots, in addition to USB, any of which would provide a route to add additional RS232 ports.

Additionally, any truly old PC would much more likely have two RS232 ports, not one.

????

An old PC has at least two RS-232 ports, and you can easily add another two. Having more then four COM ports on the old PC is possible although it is not as trivial. However you can get a newer PC and enjoy up to 16 USB to RS232 dongles.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant

The MOD5270 dev kit has three uarts, two with RS-232 level shifters, one at TTL levels.

If you don't need the Ethernet the MOD5213 has the same without the ethernet.

Paul

CTO Netburner

TTL levels.http://www.netburner.com/products/development_kits/network_developmen...

ethernet.http://www.netburner.com/products/development_kits/embedded_developme...

Thanks very much it looks like it will suit my requirements will have a read of the spec.

Just to answer some ppl confused by the requirement for 3 RS232 - it will be used to switch between three types of modems in a small submarine ( one acoustic and two radio frequency)! How exciting is that!

Rate

PS - Old PC ! eh? PPS - have asked the question dozens of times ? eh?

Rabbit? Nice modules and you can even get a C compiler from a third party.

They include something they call a C compiler but it has a number of incompatibilities with standard C. For small projects you might be able to use it though.

Robert

Do you have to work with all three modems at the same time? Why can't you just multiplex them to one port?

VLV

P.S. Still you have to get a PC :)

Hi rate, if it's just switching between modems this is the product we use in aviation (scroll down to the CE0063 Minimux)