Epson 2070 User Manual - Page 136

DATA1, Signal name, Host busy signal., Not used.

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Page 136 highlights

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 DataBit-2,6 Out Acknowledge data request signal 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

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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