This document is a quick user manual for Chonghan Technology CH-M1 wireless modem. The document includes important tips, safety and hazards, liability limitations, and also introduces the features and characteristics of the product and its usage.
The CH-M1 series wireless modem quick start guide introduces the product, outlines safety precautions, and explains how to install and configure the device for use in projects. It includes version history, reference documents, and a product list.
Key sections cover basic knowledge, test environment setup, command usage, SMS functions, hardware jumper settings, and troubleshooting tips. The guide also provides serial port configuration details and notes on compatibility with Windows HyperTerminal. This manual is written in Chinese.
| Frequency (GSM) | 900 MHz |
|---|---|
| Operating Temperature (GSM) | -25 °C to +70 °C |
| Interface | RS‑232 (DB9) |
| Frequency (GPRS) | 900 MHz |
| Operating Temperature (GPRS) | -40 °C to 480 °C |
| Frequency (CDMA) | 800 MHz |
No, the modem must be turned off on any aircraft, whether on the ground or in flight.
Set the serial port to 115200 baud, 8 data bits, no parity, 1 stop bit.
Yes, you can use the Windows built‑in HyperTerminal program to connect to the modem.
The GSM version operates from –25 °C up to +70 °C.