R21 series it's RFID smart card reader with a standard serial port, reader distance up to 80mm, it's not only simple aspect, but also stable and reliable data. Widely used for RFID Radio Frequency Identification system and project, Such as Automated parking management system, Personal identification, Access controller, Production Access control, etc Instructions for use Method of installation and use Connect with computer through a serial cable directly. When the buzzer sounded, reader into the self-inspection. And the same time, LED turn into red means standby.

Open the output of computer software, such as Serial debugging assistant. Put tag on the top of reader, the software will output a data (card number) of the tag. When reading the tag, LED light change from red to green. Detecting device is connected Open the Device Manager of computer, If appears Device and COM port is OK that means Reader has successfully into computer. Communication Format RS232 Communication 9600 bps, none parity, 8 data bits, 1 stop bit Data Format STX Length CardType SNR [0.. N] BCC ETX The following table describes the packet fields Field Length Description STX 1 0x02, the starting of a data packet.

Length 1 Length of the data bytes in the packet (except STX).
CardType 1 0x01: MF
Classic; 0x02: EM4100 SNR [0..
N] 5 SNR[0]: batch number, SNR[1..
4]: serial numbers BCC 1 BCC = Length xor CardType xor SNR[0.. N] STX 1 0x03, the ending of a data packet.
Example: 02 0A 02 06 00 8E 6D 5D B0 03
STX: 02
Length: 0A, 9 bytes
CardType: 02, EM
SNR: 06 00 8E 6D 5D, 06 = batch number, 00 8E 6D 5D = 0009334109 (DEC)
BCC: B0, B0 = 0A xor 02 xor 06 xor 00 xor 8E xor 6D xor 5D
EXT: 03