The Jizhuo Technology JZ877 is a small‑power 430‑434 MHz wireless data transmission module with UART/TTL, RS232 and RS485 interfaces.
The JZ877 module provides low‑power wireless data transmission for applications such as water, electricity, gas and wind meter reading. It operates in the 430‑434 MHz band, uses GFSK modulation, and offers 16 selectable channels. The module dimensions are 63 mm × 43 mm × 15 mm (without antenna) and it works from a 4.5‑5.5 V supply.
The device supports UART/TTL, RS232 and RS485 communication interfaces and a range of baud rates from 1200 bps to 38400 bps. Power consumption is under 360 mA in active mode, under 45 mA in RS232/RS485 mode, and below 1 mA in standby. It includes automatic retransmission, CRC checking and a 512‑byte data buffer for reliable data handling. This manual is written in Chinese.