Epson LQ-2170 - Page 137

Extensibility request:
00H:
04H:
The printer responds to the extensibility
request in the affirmative when the
request is 00H or 04H, which means:
Request nibble mode of reverse channel
transfer
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
signal name
no.
1
Host Clk
19
2
DATA 1
20
3
DATA2
21
4
DATA3
22
5
DATA4
23
6
DATA5
24
7
DATA6
25
8
DATA 7
26
9
DATA8
27
10 PtrClk
28
11
12
PtrBusy/
DataBit-3,7
ACkDataReq/
DataBit-2,6
29
28
13
Xflag/
DataBit-1,5
28
In/Out
In
In
In
In
In
In
In
In
In
Out
Out
Out
Out
Description
Strobe pulse. Input data is
latched at falling edge of the
signal.
Bit 0, LSB Parallel input data to
the printer.
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7: MSB
Used to qualify data being
sent to the host. Set LOW then
HIGH to cause an interrupt
indicating to host that data is
available.
Data bits 3 then 7, indicate
forward channel busy status,
Data bits 2 then 6. Set HIGH
until host requests data
transfer, then follows
nData Avail (nFault).
Data bits 1 then 5.
Specifications, Command Summary, and Character Tables
A-15