Serial comms at 115,200 baud?

Kevin Horton

I need to chose a microcontroller for an application where I will need to receive RS-232 data at 115,200 baud. The info that I can find on the Parallax site talks about max speed for comms to a PC, but I've seen some references that suggest that faster speeds are possible.

Can any of the BASIC Stamps receive RS-232 data at 115,200 baud?

If none of these products can do this could you recommend another microcontroller I should consider? I also need to monitor 5 discrete inputs (e.g. momentary switches to control modes) and drive 6 LEDs. I will be using a Mac running OS X to write the software, and load it to the microcontroller.

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Kevin Horton
Ottawa, Canada

LoopyByteloose

You came to the right places for high speed.· The BS2sx can do so, it clocks at 50Mhz. Also, the BS2p which has several pluses over the BS2sx including a bit less power consumption and a larger available instruction set in PBasic.· The BasicStamp will only handle these speeds without flow control.

Alternatively, you can use an SX28 protoboard and SX/B to program. That would be less expensive and you could have genuine RS-232 level drivers or RS-422/485 drivers on installed on the protoboard. It will easily run at 50Mhz, but can go to 80-100Mhz

And, if you really want more speed, the Propeller at·80Mhz·can go beyond 115k, provide video and keyboard interface, and generally knock your socks off at 160MPS.

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"Everything in the world is purchased by labour; and our passions are the only causes of labor." -- David·Hume (1711-76)········

···················· Tropically,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan

Post Edited (Kramer) : 10/7/2007 6:16:07 AM GMT

Jonathan

I have used a 2p to talk to a CMUcam at 115k, and it worked. Can't say more than that, but it did function.

Jonathan

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Kevin Horton

Thanks for the info. I'm sure I will be back here with many more questions if I end up going with a BASIC Stamp.

I'll look into the SX28 too.

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Kevin Horton
Ottawa, Canada

LoopyByteloose

I forget to mention the latest addition to the BasicStamps, the BS-2px at 32Mhz. Even more features and software capabilities. It has a voltage comparitor that can be used to monitor for low batteries. That comes in handy in remote battery powered sites and R/C flight control.

So there is really a lot to explore.

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"Everything in the world is purchased by labour; and our passions are the only causes of labor." -- David·Hume (1711-76)········

···················· Tropically,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan

Kevin Horton

I'll be studying the BS-2sx and BS-2px in more detail, as they are certainly candidates. The SX-28 and Propeller are not useful to me, as there is no OS X development environment. I am quite interested in the Propeller, but I am not prepared to purchase a new computer, and learn how to keep Windows secure.

I am also considering the Arduino family of designs, which seem to do what I need, and they have an open source OS X development environment.

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Kevin Horton
Ottawa, Canada

SSteve

You can't use the BS2px with OS X. Parallax never released a library for it, so MacBS2 can't compile for it. You can use anything else in the Basic Stamp family, though.

Parallax is a fantastic company with some great products, but they've been very clear that multi-platform support is not in the plans in the foreseeable future.

I was lucky enough to have an old Win2k laptop that I was able to take out of mothballs to use with the SX and Propeller. I made one project with the SX28, but anything I do in the future will probably be with the Prop. It's a brilliant design that's worth suffering through Windows for.

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