DECT-Switch

The DECT-Switch is designed for installation in a control box. With a range of 75mm the switch can be attached to the DIN bar.

The MD32 from Siemens AG is integrated for a radio connection. The mounting in a protective case is possible if external aerials are connected. The operational modes switch or RS232 plug can be selected by means of a mode selector. The DECT -Switch can be operated at temperatures between 0°C - 40°C. The configuration takes place over the RS232 interface by means of AT-Commands.

Switch Mode                       

When the Switch Mode is in operation, two status contacts can be transmitted both ways over radio. The hardware for the alarm transmitter and the contact transmitter is identical. The DECT-switch is configurated over the RS232 interface. The alarm transmitter is a DECT V.24 Replacement PP (Portable Part). The contact transmitter is a V.24 Replacement FP (Fixed Part). The contact transmitter and the alarm transmitter will be connected via radio by means of a log-in procedure. The input condition from In1/In2 of the contact transmitter will be transmitted directly to the alarm provider and transferred to the outputs Out1/Out2 . The out-master controls the operational state. An example of an application:

RS232 Plug Mode                                                                               

In this mode the DECT Switch operates as a normal RS232 DECT Modem. In RS232 Plug Mode the Switch can work together with the DECT Plug A2 or DECT Plug B1. The operational modes V.24 Replacement FP / PP or V.24 Server FP are possible.

General View of Functions                                                                   

DECT                                                                                              

A DECT connection consists of a fixed part (FP) and a portable part (PP). 16 PP`s belong to 1 FP. The 16 PP`s are connected to each other as a group by a log-in procedure. Now a data connection can be made between FP and PP. The group also stays intact during a loss of voltage. In our applications we use the DECT Engine MD3x by Siemens AG:

DECT radio module MD32                                                              

MD 32 is the classical DECT Engine for the cable less connection over radio of RS232 interfaces. The maximum rate of data transfer is 115,2 Kbit/s. The point to point configuration has in many devices substituted Cable, IrDa or analogue radio standards. With the high-quality server mode new ’point-off sales’ applications could be created for new product ideas.

Three operating modes can be set:

            V.24 Replacement PP (Portable Part)
            V.24 Replacement FP (Fixed Part)
            V.24 Server FP (Fixed Part)

For a point-to-point data transmission one module must be configured as a terminal device (V.24 Replacement PP, portable part), and a second as a  basis station (V.24 Replacement FP, fixed part).

• Configuration of the module over AT commands

• Four different configurations are storable

• The terminal device can log itself onto six basis stations

• The logging-on of up to 16 terminal devices onto one basis station is possible

• The  basis station configured as a V.24 Server FP can serve up to 16 RS232 connections of which 4 can be simultaneously active

• Automatic setting-up and dismantling of the connection is dependent on data traffic

• Internal error correction protocol guarantees a bit error rate of < 10^-8

• Certified according to the DECT-Standard CTR6

• Secure data transmission over a reserved frequency band, data saving protocol  (LU10 Standard) as well as data encryption

 

DECT Modem Datasheet

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