The CH-M1G2C4 is a compact GPRS modem designed for low‑data M2M applications such as utility metering, oil‑field monitoring, and security systems. It features a rugged metal housing, supports SMS, CSD, and voice calls, and offers standard serial interfaces.
Key specifications include quad‑band GSM support, DC 5‑25 V power supply, RS‑232/RS‑485/TTL data ports, and dimensions of 75 mm × 50/72 mm × 16 mm. The modem provides up to 85.6 kbps downlink and 42.8 kbps uplink speeds with GPRS Class 10 multi‑slot capability. This manual is written in Chinese.
| Frequency Bands | Quad‑Band GSM850/EGSM900/DCS1800/PCS1900 |
|---|---|
| Output Power | Class 4 (2 W) @ EGSM900, Class 1 (1 W) @ GSM1800 |
| Supply Voltage | DC 5 V – 25 V |
| Operating Temperature | -20 °C to +55 °C |
| Storage Temperature | -40 °C to +85 °C |
| Humidity Range | 30 % – 70 % RH |
| Dimensions | 75 mm × 50/72 mm × 16 mm |
| Weight | 200 g |
| GPRS Multi‑Slot Class | Class 10 |
| Downlink Speed | 85.6 kbps |
| Uplink Speed | 42.8 kbps |
| Data Interfaces | RS‑232, RS‑485, TTL |
It supports Quad‑Band GSM850, EGSM900, DCS1800 and PCS1900.
The modem operates from a DC supply of 5 V to 25 V.
The device measures 75 mm × 50/72 mm × 16 mm and weighs about 200 g.
It offers RS‑232, RS‑485 and TTL serial interfaces.