GSM Module M1

Description of the interfaces

The GSM Module M1 has interfaces for the power supply, for control and data trans- mission, for an external antenna and for a SIM card as well as an LED that indicates operating statuses. These interfaces will be described below. For a detailed description including pin assignment, see the section entitled “Technical data”.

SIM card

The GSM Module M1 must have a SIM card to operate in the GSM network. To install this card, press the yellow button to eject the carrier and insert the SIM in the carrier. Then push the carrier into the housing, making sure that it locks into place.

V.24 interface

The serial interface is used for controlling the GSM Module M1 as well as for data, fax and SMS transmission.

Connector:

9-pin DSUB (female) conforming to DIN 41652

Pin assignment:

See the section entitled “Technical data”

Logic:

V.24 asynchronous

Baud rates:

2400 - 19200 baud, autobauding

Parity:

None

Character format:

8 data bits

Stop bits:

1

Level:

Conforming to CCITT Recommendation V.28

Hybrid connector (manufacturer-specific)

The hybrid connector contains the power supply, ignition (for switching the device on and off) and the connection for the external antenna (GSM 900 MHz antenna). It is con- nected via the cable supplied.

Pin assignment:

Meaning of pins:

See the section entitled “Technical data”.

 

 

Function LED

 

LED off

Device switched off – not ready

LED flashing slowly

Device switched on – ready

LED flashing rapidly

Device switched on – connection setup

For a detailed function indication, use the corresponding AT commands.

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Siemens manual GSM Module M1 Description of the interfaces, SIM card, Interface, Hybrid connector manufacturer-specific

M1 specifications

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