USR-GPRS-MODEM
user manual
www.tcp232.net
Jinan USR IOT Technology Co., Ltd
Page 6 / 12
Pin Numbers
Pin definition
1
Carrier detect
2
Send data
3
Receive data
4
DTE ready
5
Land
6
7
DTE require to send data
8
Clear sending
9
ringing
2.5 USR-GPRS-MODEM power
This device can use 5~18v wide range voltage power supply. Instantaneous current will be very large in
wireless communication, and change rapidly, so the external power resistance should be as low as possible.
Note
：
The power supply plug polarity is internal “+” external “-”, power polarity error will lead the device
and power supply equipment to serious damage.
2.6 USR-GPRS-MODEM status indicator light
Indicator light
Working status
WORK
Normally bright, module in
working state
LINK
Flicker, GPRS service connection
success
TXD,RXD
Flicker, send and receive data
3. USR-GPRS-MODEM use
First, confirm local computer communication port can work and the port attribute. If using a USB to serial
cable connected to the computer USB interface, serial number need confirmed through the following steps :
Open the control panel- my computer- properties- hardware- device management, click "+" on the left of port,
unfold port list, device name will show the corresponding serial number as below:
Note
:
Beside the device name, if there is "!" or "X", it means the equipment installation is abnormal, please
