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
Photos
The IR diode and phototransistor are prominent on the board
Board being held in place by the rubber holster
