Epson 2070 - LQ B/W Dot-matrix Printer, Руководство пользователя

Страница: 136 / 168

Extensibility request:
OOH:
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.
GND In/Out* Description
1
HostClk 19 In Host clock signal
2 DATA1
20 In
Parallel input data to the printer.
bit 0:LSB
3
DATA2 21
In
bit 1
4 DATA3 22 In
bit 2
5
DATA4 23
In
bit 3
6 DATA5 24 In
bit 4
7 DATA6 25
In bit 5
8 DATA7
26
In bit 6
9 DATA8
27
In
bit 7:MSB
10
PtrClk 28 Out
Printer clock signal.
11 PtrBusy/ 29 Out Printer busy signal and reverse
DataBit-3,7
channel transfer data bit 3 or 7.
12 AckDataReq/
28 Out Acknowledge data request signal
DataBit-2,6
and reverse channel transfer data
bit 2 or 6.
13
Xflag/ 28 Out X-flag signal and reverse channel
DataBit-1,5 transfer data bit 1 or 5.
14 HostBusy
30
In Host busy signal.
31
INIT 30
In Not used.
32 DataAvail/ 29 Out
Data available signal and reverse
DataBit-0,4
channel transfer data bit 0 or 4.
Specifications, Command Summary, and
Character
Tables A-15