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iDP3221 User’s Manual
24
CITIZEN
6.1.3 Connector Pin Assignment NC: Non connection
Pin No. Source Compatibility Mode Nibble Mode Byte Mode
1 Host nStrobe HostClk HostClk
2 Host/Printer Data0(LSB) Data0(LSB) Data0(LSB)
3 Host/Printer Data1 Data1 Data1
4 Host/Printer Data2 Data2 Data2
5 Host/Printer Data3 Data3 Data3
6 Host/Printer Data4 Data4 Data4
7 Host/Printer Data5 Data5 Data5
8 Host/Printer Data6 Data6 Data6
9 Host/Printer Data7(MSB) Data7(MSB) Data7(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 nAutoFd HostBusy HostBusy
15 (NC) (Undefined) (Undefined)
16 GND GND GND
17 FG FG FG
18 Printer Logic-H Logic-H Logic-H
19 GND GND GND
20 GND GND GND
21 GND GND GND
22 GND GND GND
23 GND GND GND
24 GND GND GND
25 GND GND GND
26 GND GND GND
27 GND GND GND
28 GND GND GND
29 GND GND GND
30 GND GND GND
31 Host nInit nInit nInit
32 Printer nFault nDataAvail/Data0.4 nDataAvail
33 GND (Undefined) (Undefined)
34 Printer DK_STATUS (Undefined) (Undefined)
35 Printer +5V (Undefined) (Undefined)
36 Host nSelectIn IEEE 1284 Active IEEE 1284 Active
• "n" before the signal indicates that it is "L" active.
• Bi-directional communication is impossible if any one of the above signals is absent.
• Always use twisted-pair cables for signal lines, and connect return lines to signal ground.
• Ensure that the interface employs TTL level signals with the following mentioned characteristics, and that
signal rise and fall times are 0.5 µsec.
• Ignoring nAck and Busy signals while transferring data may result in loss of data.
• Ensure that the interface cable is of the minimum length possible.