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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.
3DATA2 21In Bit 1
4DATA3 22In Bit 2
5DATA4 23In Bit 3
6DATA5 24In Bit 4
7DATA6 25In Bit 5
8DATA7 26In Bit 6
9DATA8 27In 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