Products > Test Equipment

Brymen IR connection protocol - Anyone sniffed it yet?

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t1d:
Wow, Serggio, that is really great information... I learned a thing, or two... Thanks! I look forward to checking out the links... I will be busy, tomorrow, too...

Sairus:
Hi everyone.
I got brymen bm869 and right now try make my own usb cable (with blackjack and hookers).

I got one question:Are someone try to emulate genuine usb cable?

I try do it but brymen software not sending any command to my device (i use brymen VID and PID and software detect  "bu86x cable" but when i try to read it return error "no data received"). I tried with pic18f4455/18f46j50 in proteus no result,i tried in real hardware no result,i even write simple program when micro get any data from usb bus it light up the LED and it works when i send any data from hid terminal but not work with brymen software. :-//

serggio:
 :-//
Are you sure that your adapter receiving all data without error? Can you check with oscilloscope what signals from photodiode you have?
If you want to make good working cable it's no possible to do without oscilloscope. Why you use PIC? Simple USB-UART IC should be enough.

EEVblog:
Brymen BM257 protocol is here:
http://www.brymen.com.tw/product-html/software-download/Protocols/6000-count-digital-multimeters-r1.pdf

BM869 is here:
http://www.brymen.com.tw/product-html/software-download/BM860-Bs86x-V6003s-use-BC86X-Win7.zip

jadew:
Hey Dave,

Thanks for the video. It looks like the protocol described there is for their serial adapter. Given that the data you get from it is a map of the LCD panel, it's possible the protocol between the meter and the adapter is the same as the one we found on the BM867.

The only thing that will probably be different is that the BM235 won't have to wait for a trigger impulse, instead it will just output data with a time gap between the readings, since it doesn't have an RX diode.

PS: You named your video BM235 vs BM235.

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