Ericsson F251m Manual de usuario descargar pdf (Pagina 20)

GM29 TECHNICAL DESCRIPTION

LZT 123 7359 R1B

Data Terminal Ready (DTR)

DTR indicates that the DTE is ready to transmit and receive data. It also

acts as a hardware ‘hang-up’, terminating calls when switched high.

The signal is active low. You can define the exact behaviour of DTR

with an AT command.

Data Set Ready (DSR)

An active DSR signal is sent from the modem to the application (DTE)

to confirm that a communications path has been established. DSR has

two modes of operation, settable using the AT command AT&S.

Data Carrier Detect (DCD)

DCD indicates that the DCE is receiving a valid carrier (data signal)

when low. You can define the exact behaviour of DCD with an AT

command.

Ring Indicator (RI)

RI indicates that a ringing signal is being received by the DCE when

low. You can define the exact behaviour or RI with an AT command.

3.6 Real Time Clock

The GM29 contains a real time clock (RTC) to maintain accurate

timekeeping and to enable “timestamping” of messages.

The RTC is powered all the time that the modem is turned on. When the

modem is powered off, a stored energy device within the GM29

provides back-up power to maintain the RTC for at least 7 hours.

3.7 Software Updates

It is possible and sometimes necessary to update the GM29 software.

Updates must be carried out by a Sony Ericsson approved technician.

Please contact your supplier for details (see “Service and Support”,

page 9).

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Ericsson F251m Manual de usuario Pagina 20