Tally Genicom T5023+ User Manual
Page 390
Description of the physical interface
Appendix
380
T5023/5023+ - Programming Guide
Description of the signals
HostClk/nStrobe
(Host driven)
Compatibility Mode:
Set active ’low’ to transfer data into
printer
´s input
latch. Data is valid while nStrobe is low.
ECP Mode:
Used in a closed-loop handshake with
PeriphAck to transfer data or address
information from the host to the printer.
Data 1 ... Data 8
Compatibility Mode:
Forward channel data.
ECP Mode:
Host to the printer or printer to host address or
data.
PeriphClk/nAck
(Printer driven)
Compatibility Mode:
Pulsed ’low’ by the printer to acknowledge
transfer of a data byte from the host.
ECP Mode:
Used in a closed-loop handshake with HostAck
to transfer data from the printer to the host.
Epson ANSI:
The signal nAck is used to acknowledge the
data byte from the host. Additional nAck is set to
zero for a short time if the the online status is
restored.