Epson RP-U420 Series Specification page 23

Confidential
2.1.2.5 Interface Pin Assignments for Each Mode
Pin Source
1 Host
2 Host/Ptr
3 Host/Ptr
4 Host/Ptr
5 Host/Ptr
6 Host/Ptr
7 Host/Ptr
8 Host/Ptr
9 Host/Ptr
10 Printer
11 Printer
12 Printer
13 Printer
14 Hostr
15
16
17
18 Printer
19
20
21
22
23
24
25
26
27
28
29
30
31 Host
32 Printer
33
34 Printer
35 Printer
36 Host
NOTES: 1. A prefix "n" to signal names refers to "L" active signals. To the host not provided with all
the signal lines listed above, both-way communication fails.
2. For interfacing, signal lines shall use twisted pair cables with the return sides connected
to signal ground level.
3. Interfacing conditions shall be all based on the TTL level to meet the characteristics
described below. In addition, both rise time and fall time of each signal shall be 0.5µs or
less.
EPSON
Compatibility Mode
nStrobe
Data0 (LSB)
Data1
Data2
Data3
Data4
Data5
Data6
Data7 (MSB)
nAck
Busy
PError
Select
nAutoFd
NC
GND
FG
Logic-H
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
nInit
nFault
GND
DK_STATUS
+5V
nSelectIn
TITLE
RP-U420 series
Specification
(STANDARD)
Nibble Mode
HostClk
Data0 (LSB)
Data1
Data2
Data3
Data4
Data5
Data6
Data7 (MSB)
PtrClk
PtrBusy/Data3, 7
AckDataReq/Data2, 6
Xflag/Data1, 5
HostBusy
ND
GND
FG
Logic-H
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
nInit
nDataAvail/Data0, 4
ND
ND
ND
1284-Active
SHEET
REVISION
B
Byte Mode
HostClk
Data0 (LSB)
Data1
Data2
Data3
Data4
Data5
Data6
Data7 (MSB)
PtrClk
PtrBusy
AckDataReq
Xflag
HostBusy
ND
GND
FG
Logic-H
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
nInit
nDataAvail
ND
ND
ND
1284-Active
NO.
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