AR-BD14 (serv.man3). AR5132 5125 Connectivity Glossary Of Terms - Sharp Copying Equipment Handy Guide. Page 8

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In Parallel communication, eight bits of data are simultaneously sent from a PC to an
external device such as a printer. There are five current parallel communication
modes available within the market.  Each of these are briefly explained below.
The AR5132 is capable of communicating in Compatibility Mode or Nibble Mode.
For the copier to communicate in Nibble Mode, an IEEE 1284 compatible Centronics
cable must be used, and the PC must also be capable of communicating in this the
mode.  If Nibble Mode cannot be used, both the PC and the AR5132 will
communicate in Compatibility Mode.
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