Pin
no.
Signal name
GND
In/Out*
Description
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
(
n
Ack) 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
Set HIGH during 1284 mode.
18
Logic H
—
Out
This line is pulled up to +5V
through 3.9 k
Ω
resistance.
35
+5V
—
Out
This line is pulled up to +5V
through 1.0 k
Ω
resistance.
17
Chassis
—
—
Chassis GND
16,
33,
19–
30
GND
—
—
Signal GND
15,
34
NC
—
—
Not connected
*
The column heading “In/Out” indicates the direction of signal flow as
viewed from the printer.
Reverse channel pin assignments (continued)
Technical Specifications
A-13
