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Interconnect Signals
Table 3-2. Connector J2 Interconnect Signals (Continued)
Pin Number
3
C18
C19
C20
C21-C25
C26
C27-C30
C31
C32
3-6
Signal
Mnemonic
TXD1
TRANSMIT DATA (Serial Port 1) - data to be
transmitted is furnished on this line to the modem from
the terminal.
RXD1
RECEIVE DATA (Serial Port 1) - data that is
demodulated from the receive line is presented to the
terminal by the modem.
RTS1
REQUEST TO SEND (Serial Port 1) - 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.
GND
GROUND
DTR4
DATA TERMINAL READY (Serial Port 4) - a signal
from the terminal to the modem indicating that the
terminal is ready to send or receive data.
GND
GROUND
CTS2
CLEAR TO SEND (Serial Port 2) - 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.
DCD2
DATA CARRIER DETECT (Serial Port 2) - sent by the
modem to the terminal to indicate that a valid carrier is
being received.
Signal Name and Description
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