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Table 3-2. Connector J2 interconnect signals (Continued)
Pin
Number
A10
A11
A12
A13
A14
A15
A16
A17
A18-A20
A21
A22
A23
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Signal
Signal Name and Description
Mnemonic
PRACK*
DATA ACKNOWLEDGE (Printer) - a low level input
pulse indicating that the next character may be sent.
PRBSY
BUSY (Printer) - an input signal indicating that the
printer cannot receive data.
PRSEL
SELECTED (Printer) - an input signal indicating that
the printer is selected.
PRFAULT*
FAULT (Printer) - an input signal that indicates a
printer fault condition.
TXD3
TRANSMIT DATA (Serial Port 3) - data to be
transmitted is furnished on this line to the modem from
the terminal.
RXD3
RECEIVE DATA (Serial Port 3) - data that is
demodulated from the receive line is presented to the
terminal by the modem.
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.
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.
GND
GROUND
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.
TXD4
TRANSMIT DATA (Serial Port 4) - data to be
transmitted is furnished on this line to the modem from
the terminal.
RXD4
RECEIVE DATA (Serial Port 4) - data that is
demodulated from the receive line is presented to the
terminal by the modem.
P2 Adapter Board
3-3
3
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