SQ864
GPRS Terminal
8
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Rev 2.1.4 Jan 2011
Wireless Technology
Experience The Freedom
5.4 Digital Input
•
Max voltage defined in Table 6
•
Short circuit protected
•
ESD protected
•
Under full control of embedded application
The following AT commands can be used to initialise and to read the status of the GPIO:
AT#GPIO=5,2,0 (read GPIO_5, PIN1 Mini USB)
AT#GPIO=7,2,0 (read GPIO_7, PIN2 Mini USB)
AT#GPIO=8,2,0 (read GPIO_8, PIN3 Mini USB)
AT#GPIO=11,2,0 (read GPIO_11, PIN4 Mini USB)
AT#GPIO=12,2,0 (read GPIO_12, PIN5 Mini USB)
5.5 Digital Input
A standard RS232 interface is provided through a 9 way D-type socket.
All RS232 pins provide the following ESD protection:
•
+/-15kV – Human Body Model
•
+/- 8kV – IEC61000-4-2, Contact Discharge
•
+/-15kV- IEC61000-4-2, Air Gap Discharge
As a minimum, TXD, RXD and 0V are required to set up serial communications with the module.
Pin Number
Signal
Direction
Description
Voltage Level
1
DCD
Output
Data Carrier Detect
+/- 5.4V
2
RXD
Output
Received data
+/- 5.4V
3
TXD
Input
Transmit data
+/- 25V
4
DTR
Input
Data terminal ready
+/- 25V
5
0V
GND
Ground
0V
6
DSR
Output
Data set ready
+/- 5.4V
7
RTS
Input
Request to send
+/- 25V
8
CTS
Output
Clear to send
+/- 5.4V
9
RI
Output
Ring Indicator
+/- 5.4V
