Technical reference section

AT&Dn - Data Terminal Ready (DTR) options

AT&Dn

[n=0..3]

 

 

Option

Result

 

 

AT&D0

The GSM module ignores the status of the DTR control line connected

 

to the COM interface.

 

 

AT&D1

When the DTR line switches from ON to OFF, the GSM module changes

 

to command mode. The existing connection to the distant station is not

 

cleared down.

 

 

AT&D2

When the DTR line switches from ON to OFF, the GSM module sets up

 

a connection to the distant station, switches to command mode and

 

deactivates auto-answer mode. Auto-answer can be reactivated by

 

resetting DTR to ON.

 

 

AT&D3

The transition of DTR to OFF has the same effect as an AT&F command,

 

i.e. the factory configuration is loaded. An existing connection to the dis-

 

tant station is cleared down.

 

 

Data flow control

Even if your PC is set, for example, to 19200 baud, the maximum GSM rate that can be used is 9600 bit/s. A higher setting causes the GSM module to receive more data from the PC than it can transfer to the GSM network. In order to prevent a data over- flow, it must be able to interrupt the data flow from the PC. This is accomplished by means of the RTS/CTS hardware data flow control, which switches over the COM in- terface so as to interrupt the RTS (computer) and CTS (GSM module) control lines.

Memory commands

The GSM module is equipped with a 128-byte nonvolatile RAM in which the values of the modifiable S-registers and other values are stored. This section describes the val- ues, how to store them and how to use them.

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Siemens M1 manual Memory commands, AT&Dn Data Terminal Ready DTR options, Data flow control

M1 specifications

The Siemens M1 is a prominent urban transit solution designed for efficient and sustainable public transportation systems. This innovative metro train has become a staple in various metropolitan areas, known for its balance of performance, safety, and passenger comfort.

One of the key features of the Siemens M1 is its modular design, which allows for flexibility in configuration depending on specific transit needs. The train typically consists of multiple carriages that can be adjusted for length and capacity, accommodating different passenger volumes while minimizing operational costs. This adaptability makes the M1 ideal for growing urban environments where ridership numbers can fluctuate.

The Siemens M1 is built with advanced technologies that enhance its operational efficiency. It utilizes a lightweight construction, primarily through the use of aluminum, which reduces energy consumption while still maintaining structural integrity and safety standards. The train is also equipped with cutting-edge traction systems that ensure smooth acceleration and fast braking, resulting in a comfortable ride for passengers.

Safety is a paramount concern in transit systems, and the M1 incorporates various safety technologies. It features advanced signaling systems that enhance communication between trains and trackside equipment. Moreover, the train is designed with anti-collision measures and real-time monitoring systems that can detect faults before they lead to service disruptions.

Passenger comfort is another critical aspect of the Siemens M1 design. The interiors are spacious and feature modern seating arrangements, allowing for easy movement within the train. Large windows provide natural light and views of the outside environment, contributing to a more pleasant travel experience. The train also offers features like climate control, information displays, and accessibility options for passengers with reduced mobility.

Environmental sustainability is an integral part of the Siemens M1’s design. It is tailored to reduce carbon emissions, featuring energy-efficient systems that lower the overall ecological footprint. Additionally, the train can be integrated with renewable energy sources, further promoting green public transport initiatives.

Overall, the Siemens M1 stands out as a versatile and efficient urban transit option, combining modern technology and design principles that cater to the needs of both operators and passengers. With its focus on safety, comfort, and sustainability, the Siemens M1 continues to play a vital role in shaping the future of urban mobility.