Printronix S828 Programmer's Manual page 367

Programmer Manual
The pins 1 to 14 of the printer are connected to the pins with the same number of the parallel port of the
host.
The pins 19 to 30 of the printer are connected to the pins 18 to 25 of the parallel port of the host.
The pins 31, 32 and 36 of the printer are connected respectively to the pins 16, 15 and 17 of the parallel port
of the host.
1284 Mode signal names are shown with their Compatibility mode (Centronics) names in parenthesis ( ) for
the bidirectional link.
Signal Name
HostClk (nStrobe)
AD1 (Data 1)
AD2 (Data 2)
AD3 (Data 3)
AD4 (Data 4)
AD5 (Data 5)
AD6 (Data 6)
AD7 (Data 7)
AD8 (Data 8)
PrtClk (nAck)
PrtBusy (Busy)
AckDataReq (PError)
Xflag (Select)
HostBusy (nAutofd)
Peripheral Logic High
(+5 V)
n.a. (nInit)
nDataAvail (NFault)
1284 Active (NSelectIn)
Common Logic Ground
Chassis Ground
Parallel Interface Signals Behaviour
HostClk /nWrite (nStrobe)
Compatibility Mode:
Negotiation Phase:
Reverse Data Transfer Set high during Nibble Mode transfer to avoid latching data into printer. Pulsed
Phase:
AD1 ... AD8 (Data 1 ... Data 8)
Compatibility Mode:
Negotiation Phase:
Reverse Data Transfer Nibble Mode: NOT USED.
Phase:
Appendix B‐ Interfaces
Pin N° for
Signal Wire
1
2
3
4
5
6
7
8
9
10
11
13
14
15
18
31
32
36
16 and Return Wires
17
Set Active low to transfer data into printer input latch. Data is valid while nStrobe is
low.
Set active low to transfer extendibility request value into printer input latch. Data is
valid on the falling edge of HostClk.
low during Byte Mode transfers to acknowledge transfer of data from the printer.
The printer shall ensure that this pulse does not transfer a new data into the printer
input latch.
Forward channel data.
Extendibility request value.
Byte Mode: Reverse channel data.
Pin N° for
Return Wire Source
19 HOST
20 HOST in Compatibility mode and negotiation
phase.
21
22 NOT USED in Nibble mode.
23
24 BIDIRECTIONAL in Byte mode.
25
26
27
28 PRINTER
29 PRINTER
28 PRINTER
28 PRINTER
30 HOST
PRINTER
30 HOST
29 PRINTER
30
365
PTX‐S828
260071‐001A