JMY-680 series RF read-write modules are designed with non-contact technology from PHILIPS. They are micro-embedded contactless IC card read-write modules. The modules have automatic card detection function and built-in 512-byte EEPROM.
The JMY-680 series is a compact RFID reader module that supports Mifare One, Mifare Pro, Ultra Light, and TYPE‑B cards. It features automatic card detection, a built‑in 512‑byte EEPROM for data storage, and multiple interface options such as UART (TTL or RS232) and IIC.
The manual details the UART and IIC communication protocols, including baud rates, data framing, and checksum verification. It also lists all supported command codes for reading, writing, card searching, and wallet operations, with example command strings for both UART and IIC interfaces. This manual is written in Chinese.
| EEPROM size | 512 bytes |
|---|---|
| UART baud rate | 19200 bps |
| IIC communication speed | 400 kHz |
| Maximum data per operation | 16 bytes |
| Supported UART voltage levels | TTL and RS232 |
The UART interface operates at a baud rate of 19200 bps.
A single read or write operation can handle up to 16 bytes of data.
A successful command returns a response consisting of the length byte, the received command byte, the data field, and a checksum.