Rainbow Electronics GE863-PRO3 - Manual (Page 21)

GE863-PRO
3
Product Description
80285ST10036a Rev. 1 - 08/08/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 21 of 55
3.23 Buzzer output
The General Purpose I/O pin GPIO7 can be configured to output the BUZZER output signal, with only
an external MOSFET/transistor and a diode a Buzzer can be directly driven.
The ringing tone and the other signaling tones can be redirected to this Buzzer output with a specific
AT command.
3.24 RF Transmission Monitor
As alternate function of the GPIO5, the GE863-PRO
3
provide the RF transmission monitor. When the
alternate function is activated, the pin of GPIO5 changes to HIGH every time the module transmits an
RF signal and remains HIGH for the duration of the transmission sequence, i.e. it does not change
with every GSM signal burst.
3.25 EMC
Compliant to EN301-489-1 and EN301-489-7 and all applicable GSM Specifications. Compliant to
Directive 1999/05/CE.
3.26 Logic level specifications
Where not specifically stated, all the interface circuits of the GSM/GPRS engine work at 2.8V CMOS
logic levels. To get more detailed information about the logic level specifications used in the
Telit
GE863-PRO
3
interface circuits please consult the Hardware User Guide.
3.27 Reset signal
The RESET is used to reset the GSM/GPRS engine of the Telit GE863-PRO
3
modules . Whenever this
signal is pulled low, the GSM/GPRS engine is rebooted. When the device is reset it stops any
operation. After the release of the reset the GSM/GPRS engine is unconditionally rebooted, without
doing any detach operation from the network where it is registered to. This behavior is not like a
proper shut down because any GSM device is requested to issue a detach request on turn off. For this
reason the Reset signal must be used only as an emergency exit in the rare case the device remains
stucked waiting for some network response.