• State Not Answered
  • Locked Locked
  • Replies 14 replies
  • Subscribers 21 subscribers
  • Views 3775 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Need recommendation for USB or PCMCIA to RS232 (Real or latest UART)

napie poopie

Friend wanted to give me programmer board for me to try to learn but it use serial RS282 connector, but i don't have it on my labtop.
I was told centain USB to serial converter don't work. The best is to build your own using FTDI chip. I wish i knew how to do it.
But is there on the market that i can buy that is ready made USB to RS232 (Real or future UART) or even PCMCIA to RS232 (Real or latest UART), eeerrr....cheap?
That way, i can get started learning the coder immediately.

Any help would be appreciated.

PS : I seened eBay sell a lot of those USB/PCMCIA to serial RS232 adapter really cheap. Which one will work best?

Parents
  • 0

    Some programs works with just about any USB-to-RS232 adapter.

    Some programs on the other hand fails to use quote a number of adapters. It's probably a question of timing, since the USB interface - and the huge FIFO normally available in the adapters - leads to longer latencies. Some programs assumes that a received character should be visible almost instantly.

    Try to ask around for an adapter you can try. If it works, then you know what to buy.

    I would guess that you can get two or three USB-to-serial for the price of one PCMCIA-to-serial, but the prices may be different where you live.

Reply
  • 0

    Some programs works with just about any USB-to-RS232 adapter.

    Some programs on the other hand fails to use quote a number of adapters. It's probably a question of timing, since the USB interface - and the huge FIFO normally available in the adapters - leads to longer latencies. Some programs assumes that a received character should be visible almost instantly.

    Try to ask around for an adapter you can try. If it works, then you know what to buy.

    I would guess that you can get two or three USB-to-serial for the price of one PCMCIA-to-serial, but the prices may be different where you live.

Children
  • 0 in reply to ImPer Westermark

    I think you're right: the problem lies in the programs, not the adaptors.

    Programs that use the serial port purely for its intended purpose of transferring data should work with any and all adaptors;

    Programs that try to play "clever" tricks by, for example, manipulating the modem control signals are likely to fail - because it was never intended that those signals should be used in that way.

    The same can be said of much stuff that relied upon non-standard use of the parallel port...

    Always beware of such tricks - and anyone who recommends them...

  • 0 in reply to Andy Neil

    I think you're right: the problem lies in the programs, not the adaptors.

    Programs that use the serial port purely for its intended purpose of transferring data should work with any and all adaptors;

    Programs that try to play "clever" tricks by, for example, manipulating the modem control signals are likely to fail - because it was never intended that those signals should be used in that way.

    true in many cases, however FlashMagic (not an 'amateur issue') has problems because many such adapters do not handle DTR/CTS etc, correctly and, quite often (flash write time) a flash update programm need to take a break from receiving data,

    Erik