Service manual

Chapter1 Product Description
Rev. A
1-1
6
1.3.2 Parallel Interface (Reverse Channel)
[Transmission mode]
: IEEE-1284 nibble mode
[Synchronization]
: Refer to the IEEE-1284 specification
[Handshaking]
: Refer to the IEEE-1284 specification
[Data trans. timing]
: Refer to the IEEE-1284 specification
[Signal level]
: IEEE-1284 level 1 device
: TTL compatible level
[Adaptable connector]
: 57-30360(amphenol) or equivalent
[Extensibility request]
: 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.
Note) The printer sends following device ID string when it is requested.
<
00H
> <
3CH
>
Contents
MFG EPSON Production Maker
CMD ESCPL2,BDC Command system
MDL Stylus[SP]Color[SP] 400 Model name
CLS PRINTER Class
Note) [00H] denotes a hexadecimal value of zero. MDL value depends on the EEPROM setting.
Note) 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 1-11. Pin Assignment for Reverse Channel
Pin No. Signal Name Return
GND pin
In/Out Functional description
1 HostClk 19 In Host clock signal.
2-9 Data0-7 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.
10 PrtClk 28 Out Printer clock signal.
11 PtrBusy, Data Bit-3,7 29 Out Printer busy signal and reverse
channel transfer data bit 3 or 7.
12 AckDataReq, DataBit-2,6 28 Out Acknowledge data request signal and
reverse channel transfer data bit 2 or
6.
13 Xflag, DataBit-1,5 28 Out X-flag signal and reverse channel
transfer data bit 1 or 5.
14 HostBusy 30 In Host busy signal.
31 /INIT 30 In Not used.
32 /DataAvail, DataBit-0,4 29 Out Data available signal and reverse
channel transfer data bit 0 or 4.
36 1284-Active 30 In 1284 active signal.
18 Logic-H - Out Pulled up to +5V via 3.9K ohm resister.
35 +5V - Out Pulled up to +5V via 3.3K ohm resister.
17 Chassis GND - - Chassis GND.
16,33,19-30 GND - - Signal GND.
15,34 NC - - Not connected.
Note) In/Out refers to the direction of signal flow from the printer’s point of view.
Table 1-10. Device ID Description