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Proton Products SL mini and SLR mini Series Speed and Length Gauges Instruction Manual - issue 1s
P
OWER
S
UPPLY
Specification
Minimum
Typical
Maximum
Units
Power supply voltage*
15
24
28
VDC
Power consumption
15
W
*
If a long power supply cable with a significant voltage drop is used, then ensure that the voltage at
the gauge connector does not fall below the minimum value.
Connector type: DB25 female (socket)
Functional
group
Pin Designation
Description
Notes
Shield
S
Shield
Shield
Power
supply
25
+24V SUPPLY +24V power supply
2
DGND
Power supply and
signal ground (0V)
15
24
Powering on the gauge
The gauge has no power switch; as soon as power is applied it will power up and perform some self-
tests. Measurement will begin after a warm-up period of a few minutes required for the temperature of
internal components to stabilise.
Powering off the gauge
The gauge has no power switch; it may be powered off by switching off or disconnecting the power
supply to the unit.
1
1
4
2
1
5
3
1
6
4
1
7
5
1
8
6
1
9
7
2
0
8
2
1
9
2
2
1
0
2
3
1
1
2
4
1
2
2
5
1
3
