AT Command Set

Reference

Siemens

Unsolicited result code

^SBC: Undervoltage

The message will be reported, for example, when you attempt to set up a call while the voltage is close to the critical limit and further power loss is caused dur- ing the transmit burst. To remind you that the battery needs to be charged soon, the URC appears several times before the module switches off. In this case, the battery capacity is still sufficient to set up a short call.

When the module is in IDLE mode it takes typically one minute to deregister from the network and to switch off.

Undervoltage protection in mains operated applications:

•The undervoltage protection is also efficient in applications which are not bat- tery operated, i.e. in applications where the ACCU_TEMP pin is not con- nected. To use this feature it is sufficient to issue the write command which automatically enables the presentation of URCs. You do not need to specify <current>. Please note, that in contrast to battery powered applications, the ME will present the undervoltage URC only once and will then switch off with- out sending any further messages.

Note

•If Multiplex mode is active, any virtual channel can be used to enter the write command and to specify <current>. The undervoltage URC, however, appears simultaneously on all three channels.

•The URC "^SYSSTART CHARGE-ONLY MODE" is indicated automatically when the engine enters this mode (except when autobauding is active). Unlike the undervoltage URC, it cannot be disabled or enabled by the user.

Table 9: Summary of AT commands available in Charge-only and Alarm mode

AT command

Use

AT+CALA

Set alarm time

AT+CCLK

Set date and time of RTC

AT^SBC

Monitor charging process

 

Note: While charging is in progress, no battery parameters are available. To query

 

the battery capacity disconnect the charger. If the charger connects externally to

 

the host device no charging parameters are transferred to the module. In this

 

case, the command cannot be used.

AT^SCTM

Query temperature of GSM engine, enable or disable URCs

AT^SMSO

Power down GSM engine

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Siemens MC35 manual SBC Undervoltage, AT command Use
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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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