Extensibility request:
The printer responds to the extensibility
request in the affirmative when the
request is 00H or 04H, which means:
00H:
Request nibble mode of reverse channel
transfer
04H:
Request device ID in nibble mode of
reverse channel transfer
The following table lists the parallel connector pin assignments and
describes their respective interface signals.
Pin
no.
Signal name
GND
In/Out
Description
1
HostClk
19
In
Strobe pulse. Input data is
latched at falling edge of the
signal.
2
DATA1
20
In
Bit 0: LSB Parallel input data to
the printer.
3
DATA2
21
In
Bit 1
4
DATA3
22
In
Bit 2
5
DATA4
23
In
Bit 3
6
DATA5
24
In
Bit 4
7
DATA6
25
In
Bit 5
8
DATA7
26
In
Bit 6
9
DATA8
27
In
Bit 7: MSB
10
PtrClk
28
Out
Used to qualify data being
sent to the host. Set LOW then
HIGH to cause an interrupt
indicating to host that data is
available.
11
PtrBusy/
DataBit-3,7
29
Out
Data bits 3 then 7, indicate
forward channel busy status.
12
ACkDataReq/
DataBit-2,6
28
Out
Data bits 2 then 6. Set HIGH
until host requests data
transfer, then follows
nData Avail (nFault).
13
Xflag/
DataBit-1,5
28
Out
Data bits 1 then 5.
R
Sunflower-E
rev.D
A5 size Appendix
02/05/96
pass 2
Specifications, Command Summary, and Character Tables
A-15
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