This document provides the user manual for Chonghan Technology CH-D1 wireless DTU, including important notes, safety and hazards, liability limitations, etc.
The CH-D1 series wireless DTU is an industrial‑grade IP modem designed for transparent serial data transmission over GPRS or CDMA2000 networks. It supports RS‑232, RS‑485 and TTL interfaces and offers features such as real‑time online monitoring, remote activation, and hardware watchdog protection.
The manual covers important safety notices, liability limits, product specifications, various connection modes (TCP, UDP, Socket), AT and AT+i command sets, and flow‑monitoring configurations, helping users install, configure, and maintain the device in harsh industrial environments. This manual is written in Chinese.
| Supported Networks | GPRS EGSM 900 MHz, DCS 1800 MHz, CDMA2000 1X 800 MHz |
|---|---|
| Operating Temperature | -40 °C to +80 °C |
| Power Supply | DC 5 V – 25 V |
| Interface | RS‑232 / RS‑485 / TTL |
| Dimensions (L×W×H) | 75 mm × 50/72 mm × 16 mm |
AT+iTUP=2 sets the DTU to long‑connection mode.
Hardware flow monitoring can be set using the K1‑K3 options to define monitoring intervals and actions such as disconnect or short‑circuit.