This document is a developer's guide to SMS PDU-mode, which introduces the setting instructions, SMS text mode, SMS PDU mode, common AT commands, PDU operation examples, etc.
This manual provides a detailed description of the SMS PDU mode used in GSM mobile stations, including the structure of PDUs, service center handling, and message encoding. It also lists common AT commands for configuring the service center number, selecting message services, and choosing message formats.
The document includes practical examples of PDU operations, a table of abbreviations, error code explanations, and the default character set used for SMS messages. This manual is written in Chinese.
| Maximum characters per SMS (Latin) | 160 |
|---|---|
| Maximum characters per SMS (Unicode) | 70 |
The AT+CSMS command selects the message service; for example, AT+CSMS=1 enables the service.
Use the AT+CSMF (or AT+CMGF) command to set the desired format for sending, reading, and storing messages.