1-24 Features and General Specifications Rev. A
NC: Not connected, ND: Not defined
Notes:
❏ A prefix "n" to signal names refers to low active signals.
❏ If the host does not have any one of the signal lines listed above, two-way communication
fails.
❏ For interfacing, signal lines should use twisted pair cables with the return sides connected to
the signal ground level.
TM-U950P printer status and signals
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 ND ND
16 GND GND GND
17 FG FG FG
18 Printer Logic-H Logic-H Logic-H
19 to 30 GND GND GND
31 Host nInit nInit nInit
32 Printer nFault nDataAvail/Data0, 4 nDataAvail
33 GND ND ND
34 Printer DK_STATUS ND ND
35 Printer +5V ND ND
36 Host nSelectIn 1284-Active 1284-Active
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