AT Command Set

All parameters of the QoS are initiated by default to the "network subscribed value (= 0)" but the QoS itself is set to be undefined. To define a QoS use the AT+CGQREQ or AT+CGQMIN command.

Examples:

 

AT+CGQREQ=1,2

 

OK

// overwrites the precedence class of QoS of CID 1 and sets

 

// the QoS of CID 1 to be present

A following read command will response

AT+CGQREQ?

 

+CGQREQ: 1,2,0,0,0,0

 

OK

// all QoS values of CID 1 are set to network subscribed

 

// except precedence class which is set to 2

AT+CGQREQ=1

 

OK

// set the QoS of CID 1 to not present

Once defined, the CID it can be activated. To activate a CID use

AT+CGACT=1,2

 

OK

// activate CID 2

If the CID is already active, the mobile responses OK at once.

If no CID is given, all defined CIDs will be activated by

AT+CGACT=

// NO CID and NO STATE given

OK

// all defined CIDs will be activated

If no CID is defined the mobile responses +CME ERROR: invalid index

Remark: If the mobile is NOT attached by AT+CGATT=1 before activating, the attach is automatically done by the AT+CGACT command.

After defining and activating a CID it may be used to get online by

AT+CGDATA=PPP,1

 

CONNECT

// the mobile is connected using the parameters of CID 1

AT+CDATA=

 

CONNECT

// the mobile is connected using default parameter

The mobile supports Layer 2 Protocol (L2P) PPP only.

Remark: If the mobile is NOT attached by AT+CGATT=1 and the CID is NOT activated before con- necting, attaching and activating is automatically done by the AT+CGDATA command.

Some providers (e.g. D2 or E-Plus) require to use an APN to establish a GPRS connection. So if you use the Microsoft Windows Dial-Up Network and ATD*9... to connect to GPRS you must provide the context definition as part of the modem definition (Modem properties/Connection/Advanced.../Extra settings). As an alternative, you can define and activate the context in a terminal program (e.g. Micro- soft Hyperterminal) and then use the Dial-Up Network to send only the ATD command.

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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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