DAVIS DriveRight Installation - VSS (8156, 8160) - Manual (Page 15)

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The DriveRight can work with many different VSS signals provided the switch
settings of the VSS in-line circuit are set correctly. However, if the signal does not
meet the specifications below it may not work.
Maximum VSS frequency: . . . . . . . 1 khz (144,000 PPM) at 25 mph
Min peak to peak amplitude: . . . . . 1 volt at 5 mph
Max peak to peak amplitude:. . . . . 25 volts.
VSS inline-circuit Input Impedance: 22k.
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Number of digital inputs: . . . . . . . . 2
Input 1 wire color: . . . . . . . . . . . . . Green
Input 2 wire color: . . . . . . . . . . . . . Yellow
Input Impedance: . . . . . . . . . . . . . . > 1 Megaohm
High input range: . . . . . . . . . . . . . . 3 VDC min, system voltage max
Low input range: . . . . . . . . . . . . . . -0.5 min to 1.0 VDC max
Input 1 Sampling:. . . . . . . . . . . . . . Start & stop of trip, GPS record, Accident
Log
Input 2 Sampling:. . . . . . . . . . . . . . Start and stop of trip, GPS record
Input power requirements: . . . . . . . +12 VDC nominal
Fuses (3): . . . . . . . . . . . . . . . . . . . 3AG, 0.25A, Slo-Blo (1.25 x 0.25”, 6.4 x
31.8mm)
07395.062 Rev E Body D121.fm Page 13 Monday, December 1, 2003 10:52 AM