Specifications

6.1.3 Mini USB B Female connector
USB port is used for data communication and configuration, driver package is available for Windows XP, 7, Android
and Linux. Please make sure you install the driver package (File: USBDriverInstallerV3841.exe) before plugging the
device in. If you already plug it in, please reinstall the driver using those from the package, and plug your unit back.
USB will enable and emulate a Device, a Network Adapter and multiple COM Port on computer to access:
– CNS port,
– DM port,
– NMEA port,
– and AT command port.
6.1.4 15-Pin D-Sub Female connector (RS232/Audio)
This connector provides serial link and audio link to the modem.
Pin Number Name EIA designation Type Note
1 N/A Data Carrier Detect
available with R7.53 firmware
2 TxD Transmit Data Input
3 NC
4 MICROPHONE + Input
With 2VDC bias output
5 MICROPHONE - Input
With 2VDC bias output
6 RxD Receive Data Output
7 N/A Data Set Ready
available with R7.53 firmware
8 N/A Data Terminal Ready
available with R7.53 firmware
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 for 100ms to reset,
module require 5-7s to reboot
15 SPEAKER - Output
Specification of microphone and speaker to be connected:
Parameters Min Typical Max
Microphone current @ 2V/2kΩ 0.5mA
Microphone input level 100mVpp
Speaker output current 150Ω/1nF 16mA
Speaker impedance 32Ω 50Ω
Please refer to the document "Application note - Power supply & Audio" for more information about audio connection.
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