Hi there, Here is the Card number frame format: hexadecimal ID code (4 bytes) + check code (1 byte). For example, The number on the ID card is 0009321926 14215814, The output is 00 8E 3D C6 75 (75=00^8E^3D^C6). thanks.

This page says EM4100 cards have 64 bits of data: http://www.priority1design.com.au/em4100_protocol.html

Hi tom~You can see pin map in the page below. Regards =================================dividing line============================== https://github.com/Seeed-Studio/RFID_Library/blob/master/README.md

Hi there, we do not have the FCC certification for this module and there is no plan yet this moment. thanks.

I did a little reverse engineering by myself, so: 1. There's no special RFID-IC on the module. It's a Microcontroller from ST: STM8S003F3 2. The RST-Pin is the RESET of the Microcontroller. I still don't know what the S-Pin is for.. 3. Now I can read from the UART. The supply voltage was too low.. My fault. But why is it reading just four numbers instead of five? I know that there are five numbers stored on my RFID-Tags.

Hi terry, please drop mail to order@seeed.cc for the detail info. thanks.

Hi there, I suspect you use the arduino uno D0/D1 for serial print and rf module communication as well. it is conflict. so please use the D2/D3 for rf module communication and D0/D1 for serial monitoring. Please send mail to techsupport@seeed.cc. I will forward the code to you. thanks.

Hi Dear Customer, this reader uses the serial port. we suggest the software serial to readers, and hardware serial port for the PC display. So you can connect multiple readers. Bill