Accessible at the back, after removing safety cover: battery slot, SIM card holder, hardware configuration DIP
switches. Disconnect all wires and cables from the M2MBoxPro before removing the safety cover.
1.2.1
Serial port 1
This is a RS232 serial interface on 9 pins D-subminiature female connector, that can be used to connect an
external computer, a PSTN modem, an industrial machine or a wireless transceiver. The pin assignment is
standard DCE pinout.
Pin number
Name
EIA designation
Type
1
DCD
Data Carrier Detect
Output
2
RXD
Receive Data
Output
3
TXD
Transmit Data
Input
4
DTR
Data Terminal Ready
Input
5
GND
Ground
Ground
6
DSR
Data Set Ready
Output
7
RTS
Request To Send
Input
8
CTS
Clear To Send
Output
9
RI
Ring Indicator
Output
Using a DIP switch, you can select pin 9 of the connector to be either the RI signal (output from the M2MBoxPro),
either a +6V 380mA voltage output that can be used to power an external device. For energy saving, the +6V
output is deactivated when the device is off.
Confidential, the whole document is the sole property of Maestro Wireless Solutions ltd.
3603-9, 36/F., 118 Connaught Road West, Sheung Wan, Hong Kong
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