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Pin no. Signal name GND In/Out Description
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 X-flag signal and reverse
channel transfer data
bit 1 then 5
14 HostBusy 30 In Set LOW to indicate that
host can receive
peripheral device to
host data. Then set high
to acknowledge receipt
of that nibble. Set high
in response to PtrClk
(nAck) low pulse to
re-enter reverse data
transfer phase.
31
INIT 30 In Not used.
32 DataAvail/
DataBit-0,4
29 Out This signal is LOW when
the printer is in an error
state.
36 1284-Active 30 In 1284 active signal
18 Logic H - Out Pulled up to +5V
through 3.9 k
Ω
resistance.
35 +5V - Out Pulled up to +5V
through 3.3 k
Ω
resistance.
17 Chassis - - Chassis GND.
R
Elbe+
A5 size Appendix A
3-25-96 MT, pass 4
Technical Specifications
A-13