Kodak PROFESSIONAL LED II 20P - Manual (Page 134)

Specifications
B-12 September 2000
SCSI Cable
A single-ended or differential-ended SCSI cable is required to connect the host
computer to the printer. Install a single-ended SCSI cable if the distance between
the host computer and the printer is less than 6 meters. Use a differential-ended
SCSI cable if the distance between the host computer and the printer is greater
than 6 meters but less than 30 meters.
IMPORTANT: The printer is configured in single-ended mode at the factory.
Before installing a differential-ended SCSI cable, you must contact
your Kodak service representative to have your printer
reconfigured to the differential-ended mode.