The manual details features, specifications, installation, configuration, testing and troubleshooting of the CR3422 GPRS wireless data acquisition unit.
The CR3422 GPRS Wireless Data Acquisition Unit (RDTU) is a high‑performance remote data collection terminal that integrates analog signal acquisition, I/O control and GPRS communication. It supports up to 4 analog inputs, 2 digital inputs and 2 digital outputs, and can be expanded via RS‑485 bus.
This user manual provides a product overview, technical specifications, hardware and serial interface details, installation steps, parameter configuration, communication testing procedures, and a FAQ section for common issues. This manual is written in Chinese.
| Operating Voltage | 9~24 V (recommended 24 V) |
|---|---|
| Power Consumption (Standby) | 140–160 mA |
| Power Consumption (Online) | 220–360 mA |
| Operating Temperature | -40 °C ~ +85 °C |
| Dimensions (without antenna) | 139 mm × 78 mm × 27 mm |
| Serial Interfaces | RS‑232 (3‑wire) and RS‑485 |
| Baud Rate Range | 300 ~ 230 400 bps |
| Watchdog | Hardware & software dual watchdog |
The device can be reset externally via the Reset interface, which restores the factory configuration.