Motorola MVME712AM 用户手册

Interconnect Signals

3-17

C6

11

PRD02

DATA (bit 2) (Printer) 

A6

12

PRD01

DATA (bit 1) (Printer) 

C7

13

PRD04

DATA (bit 4) (Printer) 

A7

14

PRD03

DATA (bit 3) (Printer) 

C8

15

PRD06

DATA (bit 6) (Printer) 

A8

16

PRD05

DATA (bit 5) (Printer) 

C9

17

GND

GROUND 

A9

18

PRD07

DATA (bit 7) (Printer) 

C10

19

GND

GROUND 

A10

20

PRACK*

DATA ACKNOWLEDGE (Printer) - a low level input 
pulse indicating that the next character may be sent. 

C11

21 

PRPE

PAPER EMPTY (Printer) - out of paper. 

A11

22

PRBSY

BUSY (Printer) - an input signal indicating that the 
printer cannot receive data. 

C12

23

INPRIME*

INPUT PRIME (Printer) - an output signal that clears 
the printer buffer and initializes the logic. 

A12

24

PRSEL

SELECTED (Printer) - an input signal indicating that 
the printer is selected. 

C13

25

GND

GROUND 

A13

26

PRFAULT* FAULT (Printer) - an input signal that indicates a 

printer fault condition. 

C14

27

GND

GROUND 

A14

28

TXD3

TRANSMIT DATA (serial port 3) - data to be 
transmitted is furnished on this line to the modem 
from the terminal. 

C15

29

GND

GROUND 

A15

30

RXD3

RECEIVE DATA (serial port 3) - data that is 
demodulated from the receive line is presented to the 
terminal by the modem. 

C16

31

CTS3

CLEAR TO SEND (serial port 3) - 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.