This document introduces the usage, features, technical parameters, appearance and dimensions, wiring, instructions, and communication protocol of the Z7-821 wireless temperature acquisition device produced by Tangshan Zhongzhi Technology Development Co., Ltd.
The Z7-821 wireless temperature collector is designed for short‑range indoor temperature monitoring and transmission. It offers a wide measurement range, high accuracy, and robust anti‑interference design, with a rail‑mountable housing.
The manual provides detailed wiring instructions, power‑up procedures, communication settings (433 MHz, 1200 bps), and command protocols for reading temperature, setting device address, and displaying data. Safety and handling notes are also included. This manual is written in Chinese.
| Measurement range | -99.9 °C ~ +99.9 °C |
|---|---|
| Operating temperature range | -10 °C ~ +60 °C |
| Supply voltage | +5 V ~ +12 V |
| Transmission distance | 1.5 km (open area, antenna 3 m above ground) |
| Working frequency | 433 MHz |
| AD resolution | 16 bit |
| Display resolution | 0.1 °C |
| Physical size | 121 mm × 71.5 mm × 25.5 mm |
| Installation method | Rail mount |
Connect the antenna and PT1000 sensor first, then apply power; the device will display its address within 15 seconds.
A green LED means the device has received a command from the host, while a red LED indicates the device is responding.
Send the address‑setting command via the 433 MHz communication protocol; valid addresses are 0‑254, with 255 used as a broadcast address.
No. During the first 15 seconds after power‑up the device only displays its address; communication becomes available after this period.