GSM100 rfsolutions.ltd, GSM100 Datasheet - Page 5

• Manufacturer Part Number: GSM100
• Description: Gsm & Gprs Modem
• Manufacturer: rfsolutions.ltd

DS100-1 May ’07
4
1.2.3. 15-PIN D-SUB Female connector (RS232 / Audio)
-
Specification of microphone and speaker to be connected :
Microphone current @2V / 2K Ohm
Microphone input level
Speaker output current 150 Ohm/ 1nF
Speaker impedance
Please refer to the document “Application notes - Power supply & Audio” for more information of audio
connection.
1.2.4. 4-PIN connector (Power, Input / Output)
Pin assignment of 4-pin connector
Pin number
1
2
3
4
Pin number
The connector provides serial link and audio link to the modem.
10
12
13
14
15
11
1
2
3
4
5
6
7
8
9
Parameters
Name
I/O
~INTR
POWER -
POWER+
MICROPHONE (+)
MICROPHONE (-)
GSM & GPRS Modem
SPEAKER(+)
SPEAKER(-)
RESET
BOOT
Name
DCD
GND
DSR
DTR
CTS
RTS
www.rfsolutions.co.uk
RX
TX
RI
32ohm
Min
Data Terminal Ready
Data Carrier Detect
EIA designation
Request to Send
©2007 REG No 277 4001, ENGLAND.
Data Set Ready
Functions
Input / Output port
Interrupt function triggered by pulling this pin to
ground or LOW level; reserved for additional
functions with new firmware
DC power negative input
DC power positive input
Transmit Data
Clear to Send
Ring Indicator
Receive Data
Typical
0.5 mA
50ohm
16mA
Ground
100 mVpp
Max
Ground
Output
Output
Output
Output
Output
Output
Output
Type
Input
Input
Input
Input
Input
Input
Input
With 2V DC bias
Pull low to reset
Not used
Remark
output
Note
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