This manual provides an overview of the CH-M1 series wireless modem, including safety warnings, liability limits, and contact information for Chonghan Technology. It describes the modem's purpose, supported networks, and how to install and configure the device.
The document also contains reference tables for SMS functions, supported frequency bands, and a glossary of technical terms. Frequently asked questions address SMS length limits, sending rates, carrier compatibility, and WAP PUSH capabilities. This manual is written in Chinese.
| Supported GSM bands | EGSM 900 MHz, DCS 1800 MHz |
|---|---|
| Supported CDMA band | 800 MHz |
| Default baud rate | 19200 bps |
| Maximum SMS length (English) | 140 characters |
| Maximum SMS length (Chinese) | 70 characters |
| Typical SMS sending rate | ≈750 messages per hour |
Up to 140 English letters or 70 Chinese characters, including spaces and punctuation.
Approximately 750 messages per hour under normal network conditions.
No, you must use a CDMA modem for CDMA SIM cards.
Yes, but only to mobile users of the same carrier; sending to other carriers may result in garbled text.