Parallel Interface (Reverse Channel) - Epson Stylus Color 600 Service Manual

1.3.2 Parallel Interface (Reverse Channel)

[Transmission mode]
[Synchronization]
[Handshaking]
[Data transmission timing] :Refer to the IEEE-1284 specification
[Signal level]
[Adaptable connector]
[Extensibility request]
Note) The printer sends following device ID string when it is requested.
00H
MFG
CMD
MDL
CLS

[00H] denotes a hexadecimal value of zero. MDL value depends on the EEPROM setting.

MDL value depends on the EEPROM setting. Model name can be changed by
changing a certain address in the EEPROM.
The table below shows pin assignment for reverse channel(*3). In these case of signals, twist pair line is
used and returning side is connected to Signal GND. (*3):Reverse channel is the mode that any data is
transferred from the printer to the PC.
Table 1-13. Pin Assignment for Reverse Channel
Pin Signal Name
No.
1 HostClk
2-9 Data0-7
10 PrtClk
11 PtrBusy, Data Bit-3,7
12 AckDataReq, DataBit-2,6
13 Xflag, DataBit-1,5
14 HostBusy
31 /INIT
32 /DataAvail, DataBit-0,4
36 1284-Active
18 Logic-H
35 +5V
17 Chassis GND
16,33 GND
19-30
15, 34 NC
Note) "I/O" refers to the direction of signal flow from the printer's point of view.
Rev. A
:IEEE-1284 nibble mode
:Refer to the IEEE-1284 specification
:Refer to the IEEE-1284 specification
:IEEE-1284 level 1 device
:TTL compatible level
:57-30360 (amphenol) or equivalent
:The printer responds affirmatively when the extensibility request values
are 00H or 04H, that mean;
00H :Request Nibble Mode Reverse Channel Transfer.
04H :Request device ID; Return Data using Nibble Mode Rev Channel
Transfer.
Table 1-12. Device ID Description
3CH
EPSON
ESCPL2,BDC
Stylus[SP]Color[SP] 600
PRINTER
Return I/O
GND pin
19 In Host clock signal.
20-27 In The DATA0 through DATA7 signals represent data bits 0
to7, respectively.
Each signal is at high level when data is logical 1 and low
level when data is logical 0. These signals are used to
transfer the 1284 extensibility request values to the
printer.
28 Out Printer clock signal.
29 Out Printer busy signal and reverse channel transfer data bit
3 or 7.
28 Out Acknowledge data request signal and reverse channel
transfer data bit 2 or 6.
28 Out X-flag signal and reverse channel transfer data bit 1 or 5.
30 In Host busy signal.
30 In Not used.
29 Out Data available signal and reverse channel transfer data
bit 0 or 4.
30 In 1284 active signal.
- Out Pulled up to +5V via 3.9K ohm resister.
- Out Pulled up to +5V via 3.3K ohm resister.
- - Chassis GND.
- - Signal GND.
- - Not connected.
Chapter 1 Product Description
Contents
Production Maker
Command system
Model name
Class
Functional description
1-17