GE863-QUAD / PY Software User Guide
GE863-QUAD / PY Software User Guide
GE863-QUAD / PY Software User Guide
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>GE863</strong>-<strong>QUAD</strong> / <strong>PY</strong> <strong>Software</strong> <strong>User</strong> <strong>Guide</strong><br />
1vv0300746 Rev. 1 - 23/10/06<br />
3.3 GSM Power Saving function<br />
The Telit <strong>GE863</strong>-<strong>QUAD</strong> / <strong>PY</strong> has a special function that reduces the power consumption during the<br />
idle time, thus allowing a longer standby time with a given battery capacity.<br />
This function monitors the DTR line indicating that the OEM application is ready to send commands,<br />
when it goes high (3V on UART) then the OEM application is not going to send any commands and<br />
the <strong>GE863</strong>-<strong>QUAD</strong> / <strong>PY</strong> module can save energy by shutting down its internal serial port.<br />
When the OEM application becomes again ready, then the line DTR is tied low (0V on UART); the<br />
<strong>GE863</strong>-<strong>QUAD</strong> / <strong>PY</strong> detects this condition and powers up the serial port.<br />
If the power saving function is activated, then the serial port must support the DTR line since when this<br />
line is high (Data Terminal is NOT ready) the device goes into a sleep condition and will not respond<br />
to commands until the DTR is tied low (Data Terminal is ready).<br />
NOTE: The power saving function does not affect the network behavior of the <strong>GE863</strong>-<strong>QUAD</strong> /<br />
<strong>PY</strong>, even during the power save condition the module remains registered on the network and<br />
reachable for incoming calls or SMS. If a call income during the power save, then the module<br />
will wake up and proceed normally with the unsolicited incoming call code.<br />
The DTR functionality is usable only when +CFUN=5 is selected.<br />
TIP: When the <strong>GE863</strong>-<strong>QUAD</strong> / <strong>PY</strong> wakes up from the sleep mode, it takes a maximum of 150<br />
milliseconds before it can exchange commands on the serial port. Hence place a delay of at<br />
least 150 ms between the port opening (DTR lowering) and command sending.<br />
According to the V24 standard, when the module is not ready to receive commands it will tie<br />
up the CTS line, while it will pull it down when it's ready to receive commands; hence you can<br />
monitor the CTS line to ensure the <strong>GE863</strong>-<strong>QUAD</strong> / <strong>PY</strong> is ready for commands.<br />
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 57 of 117
Change language