The CH‑D1X1C1 SMS DTU is a plug‑and‑play device designed for M2M SMS communication with a robust metal enclosure, standard power, antenna and data connectors, and a SIM‑card holder. It provides RS‑232, RS‑485 and TTL serial interfaces for transparent data transmission.
It is suited for a wide range of applications such as utility meter reading, remote equipment maintenance, logistics, security monitoring, and weather data collection. The unit operates on quad‑band GSM networks and supports AT commands for easy integration. This manual is written in Chinese.
| Frequency Bands | Quad‑Band GSM850/EGSM900/DCS1800/PCS1900 |
|---|---|
| Output Power | Class 4 (2 W) @ GSM850/EGSM900; Class 1 (1 W) @ DCS1800/PCS1900 |
| Operating Voltage | DC 5 V ~ 25 V |
| Operating Temperature | -20 °C to +55 °C |
| Storage Temperature | -40 °C to +85 °C |
| Humidity Range | 9 % ~ 90 % RH |
| Dimensions | 75 mm × 50/72 mm × 16 mm |
| Weight | 200 g |
| SMS Length | 140 Byte |
| Sending Buffer | 16 SMS |
It supports RS‑232, RS‑485 and TTL interfaces via a 9‑pin sub‑D socket.
The device operates from –20 °C to +55 °C.
The sending buffer can hold up to 16 SMS messages.
It accepts a DC input voltage between 5 V and 25 V.