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A.1 Physical Specifications
Appendix A-3
(2) Physical specifications
Table A.1 SCSI physical specifications
Item Specification
Driver/Receiver Single-ended
Connector 50 Contact Shielded Low Density
Max. cable length 6 m
Characteristic
impedance
132 Ω
Cable type 25 signal twisted pair
Cable
Stub wire
≤ 0.1 mm (from main cable in scanner to internal wiring)
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 ≤ 0.5 V)
Signal
level
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 0.4 V input voltage)
Input hysteresis = 0.2 VDC min.
Connector pin assignments for
signal lines
See (4).
(3) Termination
+5 V
- signal
220 Ω¶
330 Ω