Specifications

EPSON Stylus COLOR 200
Ink Jet Printers 6/96 EPSON Stylus COLOR 200-5
Reverse Channel Pin Assignments
* The column heading “In/Out” indicates the direction of signal flow as
viewed from the printer.
Timing Chart
Note:
Transition time (both the rise and the fall) of every signal must be
less than 0.2
µ
s.
Initialization
The printer can be initialized (returned to a fixed set of
conditions) in these ways:
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.
Extensibility
request:
The printer responds to the
extensibility request in the affirmative
when the request is 00H or 04H,
which means:
00H:
04H:
Request nibble mode of
reverse channel transfer
Request device ID in nibble
mode of reverse channel
transfer
Pin
no. Signal name GND
In/
Out Description
1 HostClk 19 In Strobe pulse. Input data is
latched at falling edge of the
signal.
2 DATA0 20 In These signals represent
information in bits 0 to 7 of
parallel data respectively.
Each signal is at HIGH level
when data is logical 1 and
LOW when it is logical 0.
These signals are used to
transfer the 1284 extensibility
request values to the printer.
3 DATA1 21 In
4 DATA2 22 In
5 DATA3 23 In
6 DATA4 24 In
7 DATA5 25 In
8 DATA6 26 In
9 DATA7 27 In
10 PtrClk 28 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.
11 PtrBusy/
DataBit-3,7
29 Out Data bits 3 then 7 indicate
forward channel busy status.
12 ACkDataReq
/ DataBit-2,6
28 Out Data bits 2 then 6. Set HIGH
until host requests data
transfer, then follows
n
Data Avail (
n
Fault).
13 Xflag/
DataBit-1,5
28 Out X flag signal and reverse
channel transfer data bits 1
then 5.
14 HostBusy 30 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.
31 INIT 30 In Not used
32 DataAvail
/
DataBit-0,4
29 Out This signal is LOW when the
printer is in an error state.
36 1284-Active 30 In Set HIGH during 1284 mode.
18 Logic H — Out This line is pulled up to +5V
through 3.9 k
Ω
resistance.
35 +5V — Out This line is pulled up to +5V
through 1.0 k
Ω
resistance.
17 Chassis — — Chassis GND
16,
33,
19
–
30
GND — — Signal GND
15,
34
NC — — Not connected
Hardware
initialization
• The printer is turned on.
• The printer receives an
INIT signal from the parallel
interface: pin 31 goes LOW.
Software
initialization
• Software sends the ESC @ (initialize the printer)
command. The last panel settings are kept.
Pin
no. Signal name GND
In/
Out Description
BUSY
DATA
0.5 µs (Min.)
0 µs (Min.)
5 µs (Typ.)
0 µs (Min.)
A
CKNLG
STROBE