Epson LQ-2070 - Page 138

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 Host clock signal
2 DATA1 20 In Parallel input data to the printer.
bit 0:LSB
3DATA221Inbit 1
4DATA322Inbit 2
5DATA423Inbit 3
6DATA524Inbit 4
7DATA625Inbit 5
8DATA726Inbit 6
9DATA827Inbit 7:MSB
10 PtrClk 28 Out Printer clock signal.
11 PtrBusy/
DataBit-3,7
29 Out Printer busy signal and reverse
channel transfer data bit 3 or 7.
12 AckDataReq/
DataBit-2,6
28 Out Acknowledge data request signal
and reverse channel transfer data
bit 2 or 6.
13 Xflag/
DataBit-1,5
28 Out X-flag signal and reverse channel
transfer data bit 1 or 5.
14 HostBusy 30 In Host busy signal.
31
INIT 30 In Not used.
32
DataAvail/
DataBit-0,4
29 Out Data available signal and reverse
channel transfer data bit 0 or 4.
36 1284-Active 30 In 1284 active signal.
R
Sunflower-P
rev.c
A5 size Appendix
01/09/96
pass 2
Specifications, Command Summary, and Character Tables
A-15