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Converting early riser monitor from wheel count to GPS............
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wildcat1
Posted 5/26/2020 10:10 (#8280975 - in reply to #8280547)
Subject: RE: Converting early riser monitor from wheel count to GPS............


South Central Kansas
tedbear - 5/26/2020 06:25

BLUF: If your Early Riser connection has four pins, a radar mating cable will likely need four pins also.

Many Early Riser Monitors use an AMP 4 pole connector where the "fourth" pin is used to determine whether they are connected to a radar gun/emulated radar from GPS as opposed to a wheel sensor. Check the connector on the Early Riser cable. If it has only 3 pins then no problem. If it has 4 pins then read further.

The idea is that when the Early Riser is connected to a radar gun, Pin 4 informs the Early Riser of this and the Early Riser changes its behavior to work with a radar gun. If Pin 4 is not present on the mating connector, the Early Riser assumes it is connected to the wheel sensor and behaves in a manner to work with it. This eliminates the need for a switch or setting in the monitor as it is automatic. This can cause confusion when certain radar guns are used.

With a radar gun such as a Dickey John II, Pin 1 is ground, Pin 2 is signal, Pin 3 is 12V power to the gun. Within the gun Pin 3 is tied to Pin 4. This means that when connected 12V comes IN on Pin 3 which powers the gun AND returns back OUT on Pin 4. Upon initial startup the Early Riser will "watch" for 12V on Pin 4. If it "sees" 12V on Pin 4, it will expect that it is connected to a radar gun.

When I worked as a Tech, we made many adapter cables. We always included Pin 4 and connected it to Pin 3. This meant if the monitor was "looking" for voltage on Pin 4, it would find it. If there was no Pin 4 on the monitor end then having it present end would not cause any problem. The hockey puck style from Sensor-1 likely has Pin 4. If so then there is no concern.



Thanks for the info! I will pass this along when we get a cable made.


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