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Pin # Signal
I/O
Name
Type
38
–CTS
O
39
–DCD
O
40
–DTR
I
41
GND
GND Ground
42
SPK–
O/O
43
SPK+
O/I
58
LED
O
LINK
PWR DC Input Power. 3.3 V or 5 V DC power, depending upon the build.
61
VCC
63
GND
GND Ground
Pin 58 – LED Mode
LED Mode – Pin 58
Off
600 ms ON / 600ms OFF
75 ms ON / 75 ms OFF / 75 ms ON
3 s OFF
Flashing
ON
LEDs and SocketModem Status
The flashing LED signal is used to indicate the working mode of the SocketModem.
Signal
SocketModem Status
OFF
Download mode or switched OFF>
ON
Continuously lit
Flashing
Multi-Tech Systems, Inc. SocketModem EDGE Embedded Wireless Modem Developer's Guide (S000376A)
Description
Clear to Send (Active Low). –CTS is controlled by the module to indicate whether or
not the module is ready to transmit data. –CTS ON indicates to the DTE that signals
on TXD will be transmitted. –CTS OFF indicates to the DTE that it should not transfer
data on TXD.
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.
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.
Wireless
Wireless
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.
Operating Status
SCME is off or run in SLEEP, Alarm, or Charge-
only mode.
No SIM card inserted or no PIN entered, or
netowrk search in progress, or ongoing user
authentication, or network login in progress.
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.
Depending on type of call:
Voice Call:
Data Call:
Switched ON (not registered on the network)
Switched ON (registered on the network)
Chapter 2 – Mechanical Specifications
Connected to remote party.
Connected to remote party or
exchange of parameters while
setting up or disconnecting a call.
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