The CH-D1G2S2 GPRS DTU is an industrial‑grade dual‑band wireless modem designed for low‑data‑rate M2M communication. It features a rugged metal enclosure, standard serial interfaces, and a SIM card slot, making it suitable for plug‑and‑play deployment in various field devices.
Key specifications include dual‑band EGSM 900 MHz / DCS 1800 MHz operation, up to 2 W output power, DC5‑25 V supply, and support for RS‑232, RS‑485, and TTL serial ports. The device also offers GPRS multi‑slot class 10 connectivity with downlink speeds of 85.6 kbps and uplink speeds of 42.8 kbps, and it operates across a wide temperature range for harsh environments. This manual is written in Chinese.
| Frequency Bands | Dual‑Band EGSM 900 MHz / DCS 1800 MHz |
|---|---|
| Output Power | Class 4 (2 W) @ EGSM900, Class 1 (1 W) @ GSM1800 |
| Supply Voltage | DC5~25 V |
| Operating Temperature (Normal) | -20 °C to +55 °C |
| Operating Temperature (Restricted) | -25 °C to +70 °C |
| Storage Temperature | -40 °C to +85 °C |
| Humidity Range | 0 % to >90 % RH |
| Dimensions | 75 mm × 50/72 mm (fixed hole 16 mm) |
| Weight | 200 g |
| GPRS Multi‑Slot Class | 10 |
| Downlink Speed | 85.6 kbps |
| Uplink Speed | 42.8 kbps |
| Antenna Connector | SMA Female |
| Power Supply Connector | 5.5 mm × 2.5 mm |
| SIM Card Holder | Mini‑SIM, 1.8/3.3 V |
| Serial Port | 9‑pin sub‑D socket |
| Data Interface | RS‑232 / RS‑485 / TTL |
| LED Indicators | Power, Ring, Data |
The device operates normally from –20 °C to +55 °C.
It supports RS‑232, RS‑485, and TTL serial interfaces via a 9‑pin sub‑D connector.
The downlink speed is 85.6 kbps and the uplink speed is 42.8 kbps.
The package contains the DTU unit, a DB9 serial cable, a 9 V 1 A power adapter, an antenna, and a CD‑ROM with product documentation.