Specifications
Chapter 1 – Universal Socket Connectivity
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342I) 16
Pin Signal Name In/Ou
t
Description
34
–
RXD O
Received Data. The SocketModem uses the RXD line to send data to the DTE and to send
SocketModem responses to the DTE. In command mode, –RXD data presents the
SocketModem responses to the DTE. SocketModem 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 SocketModem for
transmission or to transmit commands to the SocketModem. 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 SocketModem 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 SocketModem to indicate whether or
not the SocketModem 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 SocketModem 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. Use
r
-configurable input or output pin.
49
GPIO I/O
General Purpose Input/Output. Use
r
-configurable input or output pin.
50
GPIO I/O
General Purpose Input/Output. Use
r
-configurable input or output pin.
51
GPIO I/O
General Purpose Input/Output. Use
r
-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 LIN
K
(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
Note: Pin 58 may or may not be available on some EDGE/GPRS/CDMA SocketModems currently shipping.
Of
f
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 o
r
more EDGE/GPRS/CDMA contexts activated.
Indicates EDGE/GPRS/CDMA data transfer: When a 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.