AT Command Set

1.3Conventions

Throughout the document, the GSM engines are referred to as ME (Mobile Equipment), MS (Mobile Station), TA (Terminal Adapter), DCE (Data Communication Equipment) or facsimile DCE (FAX mo- dem, FAX board). When the Siemens product names are required to distinguish the two models, MC35 is short for the engine type and MC35T for the terminal.

To control your GSM engine you can simply send AT Commands via its serial interface. The control- ling device at the other end of the serial line is referred to as TE (Terminal Equipment), DTE (Data Terminal Equipment) or plainly ´the application´ (probably running on an embedded system).

1.4Supported character sets

The ME uses 2 character sets: GSM 03.38 (7 bit, see character tables in Chapter 9.5, pg. 234) and UCS2 (16 Bit, refer ISO/IEC 10646). Also refer to Chapter 4.44 for information about selecting the character set.

When using an ASCII terminal to write characters differently coded in ASCII and GSM (e.g. Ä, Ö, Ü), you need to enter escape sequences. Such a character is translated into the corresponding GSM character value and when output later, the GSM character value is presented. Any ASCII terminal then will show wrong responses.

Table 2: Character definitions depending on alphabet (examples)

GSM 03.38

GSM character

Corresponding

ASCII

Hex

 

 

character

hex. value

ASCII character

Esc sequence

Esc sequence

Ö

5C

\

\5C

5C

35

43

"

22

“

\22

5C

32

32

ò

08

BSP

\08

5C

30

38

@

00 1)

NULL

\00

5C

30

30

1)Use of the GSM Null character may cause problems on application level when using a ´C´-function as “strlen()“ and should thus be represented by an escape sequence.

1.5AT command syntax

The "AT" or "at" prefix must be set at the beginning of each command line. To terminate a command line enter <CR>.

Commands are usually followed by a response that includes “<CR><LF><response><CR><LF>”. Throughout this document, only the responses are presented, <CR><LF> are omitted intentionally.

Table 3: Types of AT commands and responses

 

Test command

AT+CXXX=?

The mobile equipment returns the list of parameters and

 

 

 

 

value ranges set with the corresponding Write command

 

 

 

 

or by internal processes.

 

 

Read command

AT+CXXX?

This command returns the currently set value of the pa-

 

 

 

 

rameter or parameters

 

 

Write command

AT+CXXX=<...>

This command sets user-definable parameter values.

 

 

Execution command

AT+CXXX

The execution command reads non-variable parameters

 

 

 

 

affected by internal processes in the GSM engine.

 

 

 

 

 

 

 

 

 

 

 

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02.04.2002

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Siemens MC35 manual Conventions, Supported character sets, AT command syntax
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MC35 specifications

The Siemens MC35 is a compact and versatile modem designed primarily for mobile communication, data transmission, and machine-to-machine (M2M) applications. Launched in the early 2000s, it quickly became popular due to its blend of performance, reliability, and ease of integration, making it a solid choice for developers and businesses.

One of the key features of the MC35 is its support for GSM and GPRS technologies. This allows it to connect seamlessly to various networks, enabling users to transmit data at speeds that were impressive for its time. The GPRS capability can offer data rates of up to 171.2 kbps, allowing for efficient data transfer even in areas with limited connectivity.

The MC35 is designed to support both SMS and voice functionalities, making it adaptable for a range of applications. This includes remote monitoring, telemetry, and alarm signaling. The ability to send and receive SMS messages is a significant advantage for applications that require immediate alerts and notifications, enhancing its utility in security systems and industrial automation.

Furthermore, the modem is equipped with a range of interfaces, including serial communication (RS232), which makes it compatible with various hardware devices. This facilitates easy integration into existing systems, whether for industrial machinery or consumer electronics. Additionally, it features a robust software development kit (SDK), which enables developers to create custom applications tailored to their specific requirements.

Power consumption is another notable characteristic of the Siemens MC35. It is engineered to be energy-efficient, which is especially important for battery-operated devices or systems that require a prolonged operation without frequent recharging or maintenance.

In terms of physical characteristics, the MC35 is compact and lightweight, allowing it to fit into various enclosure designs without occupying much space. Its durability ensures it can perform reliably in different environments, making it suitable for outdoor and industrial applications.

To summarize, the Siemens MC35 stands out as a reliable modem with a rich feature set that includes GSM and GPRS support, SMS and voice capabilities, easy integration through various interface options, and energy-efficient operation. Its adaptability makes it a valuable tool for a wide array of communication and data transmission tasks, solidifying its place in the evolution of mobile communications technology.
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