Mifare Paxton cheap USB Reader

[caffrey]

Trying to wrap my head around this, (not easy when a joiner is fitting a new door to my office)

 

I've a cheap USB mifare reader (M301)

 

It reads the code like so into notepad :- (example)

 

2981728827

 

But the Paxton reader reads it as :-

 

999471537

 

I've worked out that Paxton is taking the hex of 2981728827 (which is B1 B9 92 3B) "reversing" it to 3B 92 B9 B1 then converting this to decimal (which comes out as 999471537)

 

Any clues as to why it does this ? I suspect it's down to the cheap USB reader as the PAXton reader matches up with the card ID

Edited July 25, 2017 by caffrey

[mavhc]

That's how numbers are stored in little endian format. The USB reader is assuming big endian format

 

https://en.wikipedia.org/wiki/Endianness

[Edu-IT]

You need a reader you can configure to set it to read the cards in a particular way, I believe.

[localzuk]

If you need a decent reader that you can configure etc... Look at the Inepro SCR708. That's what we've used on our copiers. We got them here.

[caffrey]

Thanks all, just had me baffled - I'm sure that this reader has read the cards right in the past too, as I had the correct number in for the one I was testing and I can't remember doing anything different

[mavhc]

Or just write some code to alter it

[IrritableTech]

I made a reader using an arduino and a PN532 module. I keep meaning to make it self contained with a LCD screen to display the number - one of these days.

[caffrey]

I'll write something when I batch import into Paxton, I was just curious as to what was going on when I was manually adding them

 

Shame the Paxton reader itself only works for the net2 software

@IrritableTech - sounds interesting - I'm always up for DIY