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APPENDIX
Note: 1. The prefix “n” on the signal name refers to low active signals.
If the host does not have any one of the signal lines listed above,
two-way communication fails.
2. For interfacing, signal lines should always use twisted pair cables
with the return sides connected to the signal ground level.
3. Cautions when resetting the printer using the nInit signal (#31 pin).
Reset can be made from #31 pin (nInit signal) of the interface when
the DIP switch 1 is set to on. (Factory setting is on.)
In addition, when reset has been enabled by #31 pin (nInit signal),
it can be set to reset when the following conditions have been
established: DIP switch 2 has been set to off, #36 pin (nSelectIn/
1284 active signal) is low, and #31 pin (nInit signal) is low.
4. During factory output, IFEE 1284 printer device ID reply will be
“Invalid.” To get the device ID, change DIP switch 6 to “OFF
(Valid).”
31 In nInit nInit nInit
32 Out nFault nDataAvail/Data0,4 nDataAvail
33 EXT GND — —
34 Out Compulsion Status — —
35 Out +5V — —
36 In nSelectIn 1284Active 1284Active
Pin No. Direction Compatibility Mode
Signal Name Nibble Mode
Signal Name Byte Mode
Signal Name