Specifications
Chapter 1 – Universal Socket Connectivity
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342F) 16
Pin Signal
Name
In/Out Description
34
–RXD O
Received Data. The module uses the RXD line to send data to the DTE and to send
module responses to the DTE. In command mode, –RXD data presents the module
responses to the DTE. Module responses take priority over incoming data when the
two signals are in competition for –RXD. When no data is transmitted, the signal is
held in mark condition.
35
–TXD I
Transmitted Data. The DTE uses the –TXD line to send data to the module for
transmission or to transmit commands to the module. The DTE holds this circuit in
mark state when no data is being transmitted or during intervals between characters.
36
–RI
O
RING (Active Low). Incoming ring signal from phone.
Ring Indicate. –RI output ON (low) indicates the presence of an ON segment of a
ring signal on the telephone line. The modem will not go off-hook when –RI is active;
the modem waits for –RI to go inactive before going off-hook.
SocketWireless
Bluetooth (MTS2BTSMI). Strobes 1/sec for slave indication.
37
–DSR O
Data Set Ready (Active Low). –DSR indicates module status to the DTE. –DSR
OFF (high) indicates that the DTE is to disregard all signals appearing on the
interchange circuits except Ring Indicator (–RI). It reflects the status of the local data
set and does not indicate an actual link with any remote data equipment.
38
–CTS O
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.
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
Logic Ground.
42
SPK- O
Wireless GPRS, CDMA, and EDGE. Negative analog speaker output.
43
SPK+ O
Wireless GPRS, CDMA, and EDGE. Positive analog speaker output.
48
GPIO I/O
General Purpose Input/Output. User-configurable input or output pin.
49
GPIO I/O
General Purpose Input/Output. User-configurable input or output pin.
50
GPIO I/O
General Purpose Input/Output. User-configurable input or output pin.
51
GPIO I/O
General Purpose Input/Output. User-configurable input or output pin.
56
–LED FDX O
LED Full Duplex (Active Low). LED Output. During normal operation, this pin lights
the FDX LED to indicate a full duplex mode.
57
–LED ACT O
LED Active (Active Low). LED Output. During normal operation, this pin lights the
Activity LED when transmitting or receiving. It flashes at a rate of 50ms high and
50ms low when active.
58
–LEDLINK O
LED LINK (Active Low). LED Output. During normal operation, this pin lights the
LINK LED to indicate a good link is detected.
Pin 58 LED Mode Operating Status
Off Subscriber Carrier Mode is Off or running in SLEEP mode or Alarm mode.
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.
59
–LEDCOL O
LED Collision (Active Low). LED Output. During normal operation, this pin lights the
COL LED to indicate a collision. It flashes at 50ms high and 50ms low when active.
60
–LEDSPD O
LED Speed (Active Low). LED Output. During normal operation, this pin lights the
SPEED LED to indicate 100Mbps is selected.
61
VCC PWR
DC Input Power. 3.3V or 5VDC power, depending upon the build.