Srp-270, Rev. 3.02 – BIXOLON IMPACT PRINTER SRP-270 User Manual
Page 26
Rev. 3.02
- 26 -
SRP-270
3-5-3(b) Reverse Mode Specification (Nibble / Byte mode)
Data transmission from the printer to the host computer.
The STATUS data transmission from the printer to the host computer is accomplished in the Nibble or Byte
mode. This mode allows data transmission from the asynchronous printer under the control of the host
computer. Data transmission in the Nibble mode are made via the existing control lines in units of for bits
(Nibble). In the Byte mode, data transmission in accomplished by making the 8-bit data lines bidirectional.
Neither mode can operate at the same time as the compatibility mode, so switching is always required.
3-5-3(c) Signal Specification (Compatibility/Nibble/Byte mode)
Pin No.
Source
Compatibility Mode
Nibble Mode
Byte Mode
1 Host
nStrobe HostClk HostClk
2
Host / Printer
Data 0 (LSB)
-
Data 0 (LSB)
3
Host / Printer
Data 1
-
Data 1
4
Host / Printer
Data 2
-
Data 2
5
Host / Printer
Data 3
-
Data 3
6
Host / Printer
Data 4
-
Data 4
7
Host / Printer
Data 5
-
Data 5
8
Host / Printer
Data 6
-
Data 6
9
Host / Printer
Data 7 (MSB)
-
Data 7 (MSB)
10 Printer
nAck
PtrClk
PtrClk
11 Printer
Busy PtrBusy/Data3,7 PtrBusy
12 Printer
Perror
AckDataReq
/Data2,6
AckDataReq
13 Printer
Select Xflag/Data1,5
Xflag
14 Host
nAutoFeed HostBusy HostBusy
15
NC
ND
ND
16
GND
GND
GND
17
FG
FG
FG
18 Printer
Logic-H
Logic-H
Logic-H
19~30
GND
GND
GND
31 Host
nlnit
nInit
nlnit
32 Printer
nFault nDataAvail
/Data0,4
nDataAvail
33
GND
ND
ND
34 Printer
DK_Status
ND
ND
35 Printer
+5V
ND
ND
36 Host
nSelectln 1284-Active 1284-Active
Table 3-19 IEEE1284 Pin Description
3-5-3(c) IEEE1284 I/F Cable
Host
Side
Printer Centronics
Side 36P
Figure 3-9 IEEE1284 Cable