Tally T5023+ Programming Manual page 391

Appendix
PeriphAck/Busy
Compatibility Mode:
ECP Mode:
Epson ANSI:
nAckReverse/PError
Compatibility Mode:
ECP Mode:
Epson ANSI:
Centronics = ECP PError is set to status that means PError is activ
Centronics = printer PError is set to error that means PError only set
Description of the physical interface
(Printer driven)
Driven 'high' to indicate that the printer is not
ready to receive data.
The printer uses this signal for flow control in
the forward direction. PeriphAck also provides a
ninth data bit used to determine whether
command or data information is present on the
data signals in the reverse direction.
Busy = 0: STOP status and printer ready
Busy = 1: STOPstatus , Error or printer not
ready
(Printer driven)
Driven 'high' to indicate that the printer has
encountered an error in its paper path.
The printer drives this signal 'low' to
acknowledge nReverseRequest. The host relies
upon nAckReverse to determine when it is
permitted to drive the data signals.
The signal nFault is not activ at PError but in the
global printer status 'ERROR' it is activ.
if the special printer message NO_PAPER is
send to the system.
activ if data is send to the printer without paper
inside.
T5023/5023+ - Programming Guide
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