This document is the user manual for Chonghan Technology CH-M1 Wireless Modem, which introduces important tips, safety and hazards, and liability limitations of the product.
This user manual describes the CH-M1 series wireless modems, their specifications, installation steps and operation using AT commands. It includes safety warnings, liability limits, and contact information for Chonghan Technology.
The document also provides detailed product lists, application areas, hardware jumper settings, and a comprehensive FAQ that covers common issues such as dialing failures, SMS limits, and modem compatibility. This manual is written in Chinese.
| CH-M1G1S1-100 Frequency Bands | GSM EGSM 900MHz, DCS 1800MHz |
|---|---|
| Operating Temperature Range | -25°C to +70°C |
| Interface (Model 100) | RS-232 (DB9) |
| Interface (Model 200) | RS-485 (DB9) |
The GSM modem does not support internet access; it only supports CSD, SMS, voice and fax functions.
Verify the antenna, SIM card, hardware installation, and ensure the baud rate and other parameters are set correctly.
Approximately 750 messages per hour per modem under normal network conditions.