User's Manual

Page 17 of 187
TECHNICAL MANUAL
Telit GM862 PCS
Tri Band GPRS Data Terminal System Rev.1
Operating Range - Interface levels (2.8V CMOS)
Level Min Max
Input high level 2.1V 3.3V
Input low level 0V 0.5V
Output high level 2.2V 3.0V
Output low level 0V 0.35V
For 2,0V signals:
Operating Range - Interface levels (2.0V CMOS)
Level Min Max
Input high level 1.6V 3.3V
Input low level 0V 0.4V
Output high level 1,65V 2.2V
Output low level 0V 0.35V
1.13.1 Reset signal
Signal Function I/O Pin
RESET Phone reset I/O 23 (connector SO301)
RESET is used to reset the Telit GM862-PCS module. Whenever this signal is pulled low, the
GM862 is reset. When the device is reset it stops any operation and after the release of the reset it
shuts down, without doing any detach operation from the network where it is registered to. This
behavior is not 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 not be used to normally shutting down the device,
but only as an emergency exit in the rare case the device remains stucked waiting for some network
response.
The RESET is internally controlled on start-up to achieve always a proper power-on reset sequence,
so there's no need to control this pin on start-up. It may only be used to reset a device already on
that is not responding to any command.
NOTE: do not use this signal to power off the Telit GM862-PCS module. Use the ON/OFF
signal (Pin 17 of SO301) to perform this function or the AT#SHDN command.