User's Manual

Page 16 of 187
TECHNICAL MANUAL
Telit GM862 PCS
Tri Band GPRS Data Terminal System Rev.1
Group high
Group low
1209 Hz 1336 Hz 1477 Hz
697 Hz 1 2 3
770 Hz 4 5 6
852 Hz 7 8 9
941 Hz * 0 #
1.11.17 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.
1.12 EMC
Compliant to & ETS 300–342–1 and all applicable GSM Specifications.
Compliant to Directive 1999/05/CE.
1.13 Logic level specifications
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels.
The following table shows the logic level specifications used in the Telit GM862-PCS module
interface circuits:
Absolute Maximum Ratings -Not Functional
Parameter Min Max
Input level on any
digital pin when on
-0.3V +3.75V
Input voltage on
analog pins when on
-0.3V +3.0 V