Printronix SL5000r Verweisanleitung
296
Chapter
5
IEEE 1284 Parallel Interface
Compatibility Mode can be combined with Nibble and Byte Modes to provide
bidirectional communication.
bidirectional communication.
Nibble Mode
Eight bits equals one byte. When a byte of data is sent to the printer, the eight
bits are sent over eight data lines.
bits are sent over eight data lines.
Some devices cannot send data over their eight data lines. To bypass this,
the IEEE 1284 permits data to be sent as half a byte over four status lines.
(Half a byte equals one nibble.) Two sequential four-bit nibbles are sent over
the lines.
the IEEE 1284 permits data to be sent as half a byte over four status lines.
(Half a byte equals one nibble.) Two sequential four-bit nibbles are sent over
the lines.
Data is transferred from printer to host in four-bit nibbles over the status lines,
and the host controls the transmission.
and the host controls the transmission.
Byte Mode
The printer and host send data to each other along eight data lines (one bit
per line).
per line).
If bidirectional communication is supported by the printer and the host, the
host will take control of the data transfer.
host will take control of the data transfer.
Signals
Table 13 lists each of the signals associated with the corresponding pins on
the IEEE 1284 interface. Descriptions of the signals follow.
the IEEE 1284 interface. Descriptions of the signals follow.
Table 13. IEEE 1284 Signals
Pin
Source of Data
Type of Mode
Compatible
Nibble
Byte
1
Host
nStrobe
HostClk
Host/Clk
2
Host/Printer
Data 1 (LSB)
3
Host/Printer
Data 2
4
Host/Printer
Data 3
5
Host/Printer
Data 4
6
Host/Printer
Data 5
7
Host/Printer
Data 6
8
Host/Printer
Data 7
9
Host/Printer
Data 8 (MSB)
10
Printer
nAck
PtrClk
PtrClk
11
Printer
Busy
PtrBusy
PtrBusy