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Jandy

Jandy ePump / VS Plus Pumps

The ePump and VS Plus come with a Jandy communication cable already terminated in the four-pin connector. Two of its four conductors are all you need: pins 2 and 3, black and yellow.

Use the supplied cable

Jandy ships these pumps with a communication cable. Use it rather than making one up: the pump end is a moulded four-pin connector and the colours are what identify the conductors at the far end. Strip back and cap the two you do not use.

PinColourPurposeiSmart Module
1RedSupply positiveNot connected
2BlackDataPORT terminal A
3YellowDataPORT terminal B
4GreenSupply commonNot connected
Jandy's four-pin connector, from its own manual. The outer pair is power the power centre supplies; the inner pair is the data.
The Jandy four-pin connector: pin 1 red and pin 4 green are the supply pair, pins 2 black and 3 yellow are the data pair that goes to a PORT.
Inner pair to the PORT, outer pair left alone on a self-powered device.

Pins 2 and 3 — black and yellow — are the two-way communication link. Pins 1 and 4, red and green, are the supply pair a Jandy power centre puts on the bus. The pump runs from its own mains supply and does not need them.

Cable

  • Use the supplied Jandy cable where the run allows it.
  • If it must be extended, use 22-24 AWG shielded and keep black and yellow as one twisted pair.
  • Ground the shield at the iSmart Module end only.
  • Keep it clear of the pump's power wiring.

When it does not come up

SymptomWhere to look first
No communicationSwap black and yellow — Jandy does not label them A and B.
Mainboard port deadRed or green landed on a data terminal instead of capped.
IntermittentData pair split across two twisted pairs, or shield grounded at both ends.
Works alone, fails with a second deviceBoth Jandy devices on one PORT.

Sources