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What do the 3 or 4 JB20/RIH cables do?

highlights of the JB20 cables

Fleetwatch FMS · RIH & JB20 Junction Box
What Do the 3 or 4 JB20/RIH Cables Do?
The RIH connects to the JB20 junction box with 3 or 4 cables. Each one carries something different, so knowing which cable does what helps you find a problem fast. Cable 4 is only needed when the site uses fluid pulsers 11–16.

The Cables

Cables are numbered from top to bottom. The yellow numbers on the photo match the table.

Cable What it carries
1 Power to the RIH and the solenoid valves
2 Communications between the RIH and the DeviceMaster/Moxa
Vehicle detector
Fluid pulsers 1–6
3 RF system: the fixed reader (FR55 or FR200)
Fluid pulsers 7–10
4 Fluid pulsers 11–16
Only on sites that use more than 10 fluid pulsers. Many RIHs have just 3 cables.
Side of an RIH with its four JB20 cable connectors outlined in red and numbered 1 to 4 from top to bottom

Which Cable Should I Check?

What you see Check cable
RIH display is dark, or none of the valves will open1
RIH is offline in SAM, or not talking to the server2
Fluids on pulsers 1–6 aren’t counting2
Vehicle detector isn’t working2
Vehicles aren’t being read (fixed reader)3
Fluids on pulsers 7–10 aren’t counting3
Fluids on pulsers 11–16 aren’t counting4
Before you unplug anything: turn off CB1 in the JB20 to power down the RIH. When you reconnect a cable, make sure the connector is fully seated and locked.
Not sure which cable is the problem? Contact Fleetwatch Support.