Epson STYLUS Scan 2000 Service Manual page 19

EPSON Stylus Scan 2000
DATA data byte n
-STROBE
t
setup
BUSY
t
ready
-ACKNLG
Figure 1-7. Data Transmission Timing
Table 1-9. Data transmission times
Parameter Minimum
tsetup 500 ns
thold 500 ns
tstb 500 ns
tready 0
tbusy -
tt-out* -
tt-in** -
treply 0
tack 500 ns
tnbusy 0
tnext 0
* Rise and fall time of every output signal
** Rise and fall time of every input signal
Product Description
data byte n +
t
hold
t
next
t
stb
t
busy
t
t t
reply ack
nbusy
Maximum
-
-
-
-
500 ns
120 ns
200 ns
-
10 us
-
-
Table 1-10. Typical tack time
Parallel I/F mode
High speed
Normal speed
* The Logic H signal goes low, 2.0 V or less, when the printer is turned off and
goes high, 3.0 V or more, when the printer is turned on. The receiver shall
provide an impedance equivalent to 7.5 K to ground.
4. Extensibility Request:
The printer responds affirmatively when the extensibility request values are
00H or 04H, which mean
00H Request nibble mode reverse channel transfer
04H Request Device ID;
Return data using nibble mode reverse channel transfer
Device ID:
The printer sends the following device ID string when it is requested.
IEEE 1284.4 is enabled,
[00H][5EH]
MFG:EPSON;
CMD:ESCPL2,BDC,D4,SPC;
MDL:Stylus[SP]Scan[SP]2000;
CLS:PRINTER
DES:EPSON[SP]Stylus[SP]Scan[SP]2000;
Note: (1)[00H] denotes a hexadecimal value of zero
(2)MDL value depends on the EEPROM setting.
Interfaces
Revision A
Time required
1 us
3 us
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