
Rev. A Appendix A-3
TM-T88 Series Technical Manual
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.
❏ Interfacing conditions should be all based on the TTL level. In addition, both the rise time and fall
time of each signal must be 0.5 µs or less.
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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