A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
+44(0)118 976 9014
+44(0)118 976 9020
www.siretta.co.uk
20
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Table 4.
Modem states (assume AT#SLED=2
*
)
Current Modem State
Input
Next state
Indication of new state
Power Off
Connect power
Run Mode
Green LED will flash 300ms on /
300ms off then red LED will be on
continuously
*
Run Mode
Insert a valid SIM card
On Network
Red LED will flash once every 3
seconds
*
On Network
Hold PWROFF_IN (Pin 3 -
RJ12 Power connector) to
0.5V - 42V for >0.5 seconds
Power off
Green LED will flash 300ms on /
300ms off
**
Run Mode
Hold PWROFF_IN (Pin 3 -
RJ12 Power connector) to
0.5V - 42V for >0.5 seconds
Power off
Green LED will flash 300ms on /
300ms off
**
Power Off
Hold PWRON_IN (Pin 4 -
RJ12 Power connector) to
0.5V - 42V for >0.5 seconds
Run Mode
Green LED will flash 300ms on /
300ms off then red LED will be on
continuously
*
Run Mode
Insert a valid SIM card
On Network
Red LED will flash once every 3
seconds
*
NOTE -
Normal Operation: When the modem is first switched on with a valid SIM card, the
red LED will be on continuously for about 10-15 seconds (this may vary considerably) whilst
the modem searches for the network. After this period if the modem correctly registers to
the network then the red LED will start to blink once every 3 seconds indicating everything is
running correctly and the modem is registered to the network.
If the red LED is on continuously for a long period of time (more than 5 minutes) then this
suggests there may be a problem with the SIM setup, the network signal or the antenna
connection.
The current modem state and function is shown below in
table 4.
*
LED default state is off. Need to configure AT#SLED command to enable software control of
LED flashing state.
AT#GPIO=1,0,2
AT#SLED=2
AT#SLEDSAV
**
When the command SLED=2 has been set then no activity on the red LED indicates that the
modem is powered off.
Modem States
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