User talk:Mrnuke

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BM857 PC interface cable

I'm trying to build a PC interface cable for my Brymen BM857. I have used Radioshack 276-142 IR diode and photo-transistor set, and a PL2303 USB to serial converter.

If you have a real cable you'd like to donate, hop on to #sigrok and contact me.

Info

This is an experimental homebrew design. It does NOT work. The manufacturer's cable contains a PIC microcontroller that communicates with the PC, and multimeter. The data sent through the serial port is not what the DMM receives/sends. Any straight cable will not work.

It is unclear if the IR protocol is a simple UART, or is pulse-width based, or if it uses any other encoding.

Schematic

Bm857 cable sch.svg

Photos

  • The IR diode and phototransistor are prominent on the board

  • Board being held in place by the rubber holster

Brymen BC-58Xa interface cable

This is the official interface cable sold by Brymen. It works with the BM857a and BM859a, but does not work with thw non-a models.


Photos

These are from the Extech SW810a kit. The components are all manufactured by Brymen, and carry the Brymen part numbers.

  • Kit contents (software disc not shown)

  • BC-58Xa DB9 connector

  • BC-58Xa DMM connector

  • BUA2303 USB-to-serial converter

  • BUA2303 USB-to-serial converter, back

  • BUA2303 USB-to-serial converter, bottom

  • IR side, opened

  • IR side casing

  • IR side PCB, top

  • IR side PCB, botoom

  • BUA2303 PCB, top

  • BUA2303 PCB, bottom

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