3-10
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Interconnect Signals
3
A14
TXD3
TRANSMIT DATA (Serial Port 3) - data to be
transmitted is furnished on this line to the modem from
the terminal.
A15
RXD3
RECEIVE DATA (Serial Port 3) - data that is
demodulated from the receive line is presented to the
terminal by the modem.
A16
RTS3
REQUEST TO SEND (Serial Port 3) - RTS is supplied
by the terminal to the modem when it is required to
transmit a message. With RTS off, the modem carrier
remains off. When RTS is turned on, the modem
immediately turns on the carrier.
A17
DTR3
DATA TERMINAL READY (Serial Port 3) - a signal
from the terminal to the modem indicating that the
terminal is ready to send or receive data.
A18-A20
GND
GROUND
A21
CTS1/DCD1
CLEAR TO SEND (Serial Port 1) - CTS is a function
supplied to the terminal by the modem, and indicates
that it is permissible to begin transmission of a
message. When using a modem, CTS follows the off-
to-on transition of RTS after a time delay.
A22
TXD4
TRANSMIT DATA (Serial Port 4) - data to be
transmitted is furnished on this line to the modem from
the terminal.
A23
RXD4
RECEIVE DATA (Serial Port 4) - data that is
demodulated from the receive line is presented to the
terminal by the modem.
A24
RTS4
REQUEST TO SEND (Serial Port 4) - RTS is supplied
by the terminal to the modem when it is required to
transmit a message. With RTS off, the modem carrier
remains off. When RTS is turned on, the modem
immediately turns on the carrier.
A25
TRXC4
TRANSMIT CLOCK (Serial Port 4) - this line can be
configured to clock output data to the modem from the
terminal.
Table 3-4. Connector J2 interconnect signals (Continued)
Pin
Number
Signal
Mnemonic
Signal Name and Description