Checkpoint Systems Inc. EVOLVES10 Manual De Usuario

Chapter 11 – SocketModem EDGE (MTSMC-E) 

Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342D) 

138 

 

39 –DCD 

O  Data Carrier Detect (Active Low).  –DCD output is ON (low) when a data 

connection is established and the module is ready to send/receive data. 

40 –DTR 

I 

Data Terminal Ready (Active Low). The –DTR input is turned ON (low) when 
the DTE is ready to communicate. –DTR ON prepares the modem to be 
connected, and, once connected, maintains the connection. –DTR OFF places 
the modem in the disconnect state under control of the &Dn and &Qn 
commands. 
Note: When the –DTR pin is not in use, it should be tied low. 

41 GND 

GND Ground 

42 SPK– 

O  Speaker. Negative analog speaker output. 

43 SPK+ 

O  Speaker. Positive analog speaker output. 

58 LED 

LINK 

O 

LED LINK (Active Low). LED Output. During normal operation, this pin lights 
the LINK LED to indicate a good link is detected.  See LED Mode Table below. 

61 VCC 

PWR DC Input Power. 3.3 V or 5 V DC power, depending upon the build. 

63 GND 

GND Ground 

 

Off 

SCME is off or run in SLEEP and Alarm modes. 

600 ms ON  / 600ms OFF 

No SIM card inserted or no PIN entered, or 
network search in progress, or ongoing user 
authentication, or network login in progress. 

75 ms ON  / 75 ms OFF /  75 ms ON  
3 s OFF 
Flashing 

One or more GPRS contexts activated. 
 
Indicates GPRS data transfer: When a GPRS 
transfer is in progress, the LED goes on within 1 
second after data packets were exchanged. Flash 
duration is approximately 0.5 s. 

ON 

Depending on type of call: 
Voice Call:   Connected to remote party. 
Data Call:   Connected to remote party or 

exchange of parameters while 
setting up or disconnecting a call.