Timing Chart - Epson Stylus Color 200 Manual

Extensibility The printer responds to the
request: extensibility request in the affirmative
when the request is 00H or 04H,
which means:
00H:
04H:
Reverse Channel Pin Assignments
Pin
no. Signal name GND
1 HostClk 19
2 DATA0 20
3 DATA1 21
4 DATA2 22
5 DATA3 23
6 DATA4 24
7 DATA5 25
8 DATA6 26
9 DATA7 27
10 PtrClk 28
11 PtrBusy/ 29
DataBit-3,7
12 ACkDataReq 28
/ DataBit-2,6
13 Xflag/ 28
DataBit-1,5
14 HostBusy 30
31 INIT 30
32 DataAvail/ 29
DataBit-0,4
36 1284-Active 30
18 Logic H —
Ink Jet Printers
Request nibble mode of
reverse channel transfer
Request device ID in nibble
mode of reverse channel
transfer
In/
Out Description
In Strobe pulse. Input data is
latched at falling edge of the
signal.
In These signals represent
information in bits 0 to 7 of
In
parallel data respectively.
Each signal is at HIGH level
In
when data is logical 1 and
LOW when it is logical 0.
In
These signals are used to
In transfer the 1284 extensibility
request values to the printer.
In
In
In
Out Used to qualify data being
sent to the host. Set LOW
then HIGH to cause an
interrupt indicating to host
that data is available.
Out Data bits 3 then 7 indicate
forward channel busy status.
Out Data bits 2 then 6. Set HIGH
until host requests data
transfer, then follows
n Data Avail ( n Fault).
Out X flag signal and reverse
channel transfer data bits 1
then 5.
In Set LOW to indicate that host
can receive peripheral device
to host data. Then set high to
acknowledge receipt of that
nibble. Set high in response
to PtrClk
( n Ack) low pulse to re-enter
reverse data transfer phase.
In Not used
Out This signal is LOW when the
printer is in an error state.
In Set HIGH during 1284 mode.
Out This line is pulled up to +5V
through 3.9 k resistance.
Pin
no. Signal name
35 +5V
17 Chassis
16, GND
33,
19
–
30
15, NC
34
* The column heading "In/Out" indicates the direction of signal flow as
viewed from the printer.

Timing Chart

BUSY
ACKNLG
DATA
STROBE
0.5 s (Min.)
Note: Transition time (both the rise and the fall) of every signal must be
less than 0.2 s.
Initialization
The printer can be initialized (returned to a fixed set of
conditions) in these ways:
Hardware • The printer is turned on.
initialization
• The printer receives an
interface: pin 31 goes LOW.
Software • Software sends the ESC @ (initialize the printer)
initialization command. The last panel settings are kept.
Both initialization methods reset the font according to the
default settings selected using the control panel. However,
ESC @ does not initialize the printer mechanism, clear the input
data buffer, or clear the user-defined character set.
6/96
EPSON Stylus COLOR 200
In/
GND Out Description
— Out This line is pulled up to +5V
through 1.0 k resistance.
— — Chassis GND
— — Signal GND
— — Not connected
0 s (Min.)
INIT signal from the parallel
EPSON Stylus COLOR 200-5
0 s (Min.)
5 s (Typ.)