NC: None Connect ND: Not Defined A signal name with a rule above it indicates an “L” active signal. Bidirectional communications cannot take place, unless all signal names for both sides correspond to each other. Connect all signal lines using a twisted-pair cable. Connect the return side to the signal ground level. Make sure the signals satisfy electrical characteristics. Set the leading edge and trailing edge times to 0.5ms or less. Do not ignore Ack or BUSY signals during a data transfer. Ignoring such signals may result in data corruption. Make the interface cables as short as possible.
CAUTION 56 Pin Source Compatibility Mode Nibble Mode Byte Mode 29 GND GND GND 30 GND GND GND 31 Host Init Init Init 32 Printer Fault DataAvail/Data0,4 DataAvail 33 GND ND ND 34 Printer DK STATUS _ ND ND 35 Printer +5V ND ND 36 Host SelectIn 1284-Active 1284-Active