Multi-Tech Systems F2 ユーザーズマニュアル

Chapter 1 – Product Description and Specifications  

Multi-Tech Systems, Inc. MultiModem GPRS Wireless Modem User Guide   

8  

 

The Wireless MultiModem has several interfaces: 

LED function indicating operating status 
External antenna (via SMA connector) 
Serial and control link (via 15 pins SUB D) 
Power supply (via 2.5mm miniature power jack) 
SIM card holder 

 

 

 

TD   

Transmit Data. Lit when modem is transmitting data. 

RD   

Receive Data. Lit when modem is receiving data. 

CD   

Carrier Detect. Lit when data connection has been established. 

LS  

Continuous “on” state indicates that the wireless modem is not registered on the network. 
Flashing state indicates registration on network. 
Off state. Modem is off (not ready) or in download mode. 

TR 

Terminal Ready. Commonly called “Data Terminal Ready.”  This is a readiness signal from the PC. 

PWR   

Power. Indicates presence of DC power when lit. 

 
 

10

11

6

1

5

1 5

 

1 

DCD 

109 

Data Carrier Direct 

6 

RX 

104 

Receive Data (out) 

2 TX 

103  Transmit 

Data 

8 

DTR 

108.2 

Data Terminal Ready 

9 GND 

 

Signal 

Ground 

7 

DSR 

107 

Data Set Ready 

12 

RTS 

105 

Request to Send 

11 

CTS 

106 

Clear to Send 

13 RI 

125 

Ring 

Indicator 

4 MICROPHONE 

(+) 

 

 

5 MICROPHONE 

(-) 

 

 

10 SPEAKER 

(+) 

 

 

15 SPEAKER 

(-) 

 

 

3 

BOOT 

 

For factory use only. 

14 

RESET 

 

To reset, connect to GND momentarily (typical: 
2mSec).  Open for normal operation. 

 

AT commands for the GPRS wireless modem are published in a separate Reference Guide included on the 
MultiModem CD and posted on the Multi-Tech web site. 
IP commands for GPRS modems are also published in a separate Reference Guide included on the MultiModem 
CD and posted on the Multi-Tech web site.