This manual describes the R-8555 CDMA DTU wireless communication module developed by Beijing Jizhi Da. It outlines the product overview, key features, and technical parameters such as supported CDMA frequency bands, data rates, and power requirements.
The document includes detailed installation steps, wiring diagrams, configuration commands, and operation modes (TCP, UDP, SMS). It also provides guidance on network setup, indicator LEDs, and troubleshooting procedures for reliable long‑term operation in industrial environments. This manual is written in Chinese.
| CDMA cellular band frequency | 824 MHz – 849 MHz |
|---|---|
| CDMA PCS band frequency | 1850 MHz – 1910 MHz |
| Power supply voltage | DC 12 V ~ 30 V |
| Operating current | 90 mA |
| Operating temperature range | -20 °C ~ +70 °C |
| Storage temperature range | -40 °C ~ +85 °C |
| Baud rate range | 1200 bps – 115200 bps |
The module accepts a DC power supply ranging from 12 V to 30 V.
There are two indicator LEDs: one shows power status and the other shows data communication status.
Use the command "al7+baud rate=9600" (or another supported value) to set the serial baud rate.
The module offers standard RS‑232, RS‑485, and digital I/O interfaces.