CHAPTER 2 – UNIVERSAL SOCKET PINOUT
Universal Socket Developer Guide
14
Pin Signal Name
In/Out
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
Cellular GPRS, CDMA, and EDGE. Negative analog speaker output.
43
SPK+
O
Cellular GPRS, CDMA, and EDGE. Positive analog speaker output.
44
PCM_DO
O
Digital voice custom factory option.
45
PCM_DI
I
Digital voice custom factory option.
46
PCM_FS
O
Digital voice custom factory option.
47
PCM_CLK
O
Digital voice custom factory option.
48
GPIO
1
I/O
General Purpose Input/Output. User-configurable input or output pin.
2
49
GPIO
1
I/O
General Purpose Input/Output. User-configurable input or output pin.
2
50
GPIO
1
I/O
General Purpose Input/Output. User-configurable input or output pin.
2
51
GPIO
1
I/O
General Purpose Input/Output. User-configurable input or output pin.
2
52
DBTX/GPIO
O
Not currently used.
53
DBRX/GPIO
I
Not currently used.
54
GPIO
N/A
Reserved for future use.
55
Heartbeat
N/A
Reserved for future use.
Summary of Contents for MT-SMI-DK
Page 1: ...Universal Socket MT SMI DK Developer Guide...
Page 11: ...CHAPTER 1 EMBEDDED SOLUTIONS 11 Universal Socket Developer Guide Latch Notch Sliding Lock...
Page 20: ...CHAPTER 4 DEVELOPER BOARD AND SCHEMATICS Universal Socket Developer Guide 20...
Page 23: ...CHAPTER 4 DEVELOPER BOARD AND SCHEMATICS 23 Universal Socket Developer Guide...
Page 24: ...CHAPTER 4 DEVELOPER BOARD AND SCHEMATICS Universal Socket Developer Guide 24...
Page 25: ...CHAPTER 4 DEVELOPER BOARD AND SCHEMATICS 25 Universal Socket Developer Guide...
Page 26: ...CHAPTER 4 DEVELOPER BOARD AND SCHEMATICS Universal Socket Developer Guide 26...
Page 27: ...CHAPTER 4 DEVELOPER BOARD AND SCHEMATICS 27 Universal Socket Developer Guide...
Page 28: ...CHAPTER 4 DEVELOPER BOARD AND SCHEMATICS Universal Socket Developer Guide 28...
Page 35: ...CHAPTER 6 LABELING REQUIREMENTS 35 Universal Socket Developer Guide...
