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
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+44(0)118 976 9014
+44(0)118 976 9020
www.siretta.co.uk
36
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Power
RJ12 Power Connector
This connector is used for supplying DC power and power ON/OFF signals for the
modem.
Table 12.
Pin usage
Each pin of type Input is activated when the voltage on the pin is in the range of Vin
DC (5V to +42V). The maximum output drive voltage is fixed at TTL level 3.3V.
The modem ON/OFF state is activated by the power OFF and power ON signal
inputs.
The modem ON/OFF states are shown above in
table 12
. The initial state of the
modem on power-up is ON.
Figure 26.
RJ12 power connector
Power connector
Figure 27.
Pin numbering
1 6
Pin
Name
Direction
Description
Low Level Nominal
High Level
1
Vin
Input
Input power
5V
12V
42V
2
-
-
-
-
-
-
3
PWROFF_IN
Input
Power off signal
5V
12V
42V
4
PWRON_IN
Input
Power on signal
5V
12V
42V
5
-
-
-
-
-
-
6
GND
Input
Signal ground
-
0V
-
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