OK, so it appears that the OP solved his problem (of how to get data from these modules) without ever really explaining how he did it. I tried both hardware and software serial with no luck, using the code provided by the vendor (Electrodragon). The poster before me had problems but it's not clear whether he ever solved them.
So, I decided to venture into the unknown world of Weigand, and thought I would report what I found, since I did succeed.
You need to use the two pins, D1 and D0, which are 5 and 6 on the board. The Electrodragon website implies that if you are going to use Weigand, you need to take pin 3 low, but in fact this disabled the module for me, so I left it floating, which worked.
I then needed a Weigand library and I found this one:
and then I used the author's sample code which is here
D1 and D2 need to be connected to pins 2 and 3 on the Arduino. I used an Arduino pro which operates on 3.3V. I found that the module seemed to be happy with this lower voltage.
The code worked. I can't say I understand it, or how weigand really works, but I can at least use the module.