User manual

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c. 15-Pin D-Sub Female connector (RS232/Audio)
The connector provides serial link and audio link to the modem
Pin number
Name
EIA designation
Type
Note
1
DCD
Data Carrier Detect
Output
2
TX
Transmit Data
Input
3
BOOT
Input
Not used
4
MICROPHONE (+)
Input
With 2VDC bias
5
MICROPHONE (-)
Input
output
6
RX
Receive Data
Output
7
DSR
Data Set Ready
Output
8
DTR
Data Terminal Ready
Input
9
GND
Ground
Ground
10
SPEAKER (+)
Output
11
CTS
Clear To Send
Output
12
RTS
Request To Send
Input
13
RI
Ring Indicator
Output
14
RESET
Input
Pull low to reset
15
SPEAKER (-)
Output
Specification of microphone and speaker to be connected:
Parameters
Min
Typical
Max
Remark
Microphone current @2V/2K Ohm
0.5mA
Microphone input level
100 mVpp
Speaker output current 150 Ohm/1nF
16mA
Speaker impedance
32ohm
50Ohm
Please refer to the document "Application notes - Power supply & Audio" for more
information about audio connection.
d. 4-Pin connector (Power input/output)
A cable, included in the package shall be used for power supply connection:
Pin assignment of 4-Pin connector
Pin number
Name
Functions
1
I/O
Input/Output port
2
~INTR
Interrupt function triggered by pulling this
pin to ground or LOW level; reserved for
additional functions with new firmware
3
POWER -
DC power negative input
4
POWER +
DC power positive input