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4-4
4.1.2 Physical Specification
Table 4-1 SCSI physical specifications
Item Specifications
Driver/Receiver Single-ended
Connector 50 Contact Shielded Low Density
Cable Max. cable length 6 m
Characteristic impedance
132 Ω
Cable type 25 signal twisted pair
Stub wire
≤ 0.1 mm (from main cable in scanner to internal wiring)
Signal level Terminator See the figure under (3).
Driver/receiver Open collector or three-state driver
Output characteristics Low level (true) = 0.0 to 0.5 VDC High Level (false)=2.5 to 5.25 VDC
Output current = 48 mA (corresponding output voltage ≤ 0.5V)
Input characteristics Low level (true) = 0.0 to 0.8 VDC High level (false) = 2.0 to 5.25
VDC Input load = -0.4 mA max. (at 0.4V input voltage Input
hysteresis = 0.2 VDC min.
Connector pin assignments for lines See (4).
4.1.3 Termination
220Ω
330Ω