Multi-Tech Systems 92U04A22740 User Manual
Chapter 2 – Mechanical Specifications
Multi-Tech Systems, Inc. SocketModem CDMA Developer’s Guide
8
Pin Configurations
The SocketModem CDMA uses a 13-pin interface.
SocketModem Pins - Top View
Pin Descriptions
Pin #
Signal
Name
Name
I/O
Type
Description
24
-RESET
I/O
Reset. This signal is used to force a reset procedure by providing low level during
at least 500µs. This signal is considered an emergency reset only. A reset
procedure is already driven by an internal hardware during the power-up
sequence.
This signal can also be used to provide a reset to an external device. It then acts
as an output. If no external reset is necessary, this input can be left open. If used
(emergency reset), it has to be driven by an open collector or an open drain.
at least 500µs. This signal is considered an emergency reset only. A reset
procedure is already driven by an internal hardware during the power-up
sequence.
This signal can also be used to provide a reset to an external device. It then acts
as an output. If no external reset is necessary, this input can be left open. If used
(emergency reset), it has to be driven by an open collector or an open drain.
26, 41, 63
GND
Ground
33
–RTS
I
Request to Send. The –RTS signal is used for hardware flow control.
34
–RXD
O
Received Data. The modem uses the RXD line to send received data to the DTE
and to send modem responses to the DTE.
and to send modem responses to the DTE.
35
–TXD
I
Transmitted Data. The DTE uses the –TXD line to send data to the modem or to
transmit commands to the modem.
transmit commands to the modem.
36
–RI
O
Ring Indicate. –RI output ON (low) indicates the presence of a ring signal ON
segment.
segment.
37
–DSR
O
Data Set Ready. –DSR indicates modem 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.
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. –CTS is controlled by the modem to indicate whether or not the
modem is ready to transmit data. –CTS ON, indicates to the DTE that signals
presented on TXD will be transmitted. –CTS OFF indicates to the DTE that it
should not transfer data across the interface on TXD.
modem is ready to transmit data. –CTS ON, indicates to the DTE that signals
presented on TXD will be transmitted. –CTS OFF indicates to the DTE that it
should not transfer data across the interface on TXD.
39
–DCD
O
Data Carrier Detect. –DCD output is ON (low) when a data connection is
established.
established.
40
–DTR
I
Data Terminal Ready (Active Low). The –DTR input is turned ON (low) by the
DTE when the DTE is ready to transmit or receive data. –DTR ON prepares the
modem to be connected, and, once connected, maintains the connection.
–DTR OFF places the modem in the disconnect state.
DTE when the DTE is ready to transmit or receive data. –DTR ON prepares the
modem to be connected, and, once connected, maintains the connection.
–DTR OFF places the modem in the disconnect state.
61
VCC
PWR
+5V