Originally Posted by timepart
It never came with a 4 pin cable, I thought also that this was needed for hook up.Warning: Spoiler! (Click to show)
It was working at one stage and was under "flow 12" which makes sense but now nothing appears. Under my MPS page my flow meter was recognized and it was displaying 777 as the active value for .6L/min. I guess im trying to figure out how to get this graph back after it disappeared.
This is the only MPS device in my loop and I have no pressure sensors either. I have 4 temp sensors that work fine and then this has caused me problems for some time now.[
The 3-pin cable included in the delivery is intended for the alarm output from the MPS device's RPM port to the mobo CPU fan header. It generates a fan RPM signal that can be used to shut down the motherboard if the BIOS is setup for it. It is more for if the MPS unit is used as a stand-alone device, sans aquaero. The 4-pin cable is a separate purchase. Technically the 3-pin cable can be used if you maintain the USB connection, but I find it simpler to just recommend 4-pin cables for aquabus use. There is no down side.
EDIT: For clarification, the 4th pin on the aquabus provides power which is also provided by the USB connection if it is maintained.
Snippet from the product page
Edited by InfoSeeker - 10/29/15 at 6:52am
The mps flow sensors feature an integrated microcontroller with USB and aquabus interface, a programmable alarm output, an integrated water temperature sensor and an external temperature sensor input. For monitoring and configuration, the aquasuite software can be downloaded free of charge. In addition to the USB interface, the 4-pin aquabus interface can be used to directly connect the flow sensor to an aquaero 5 controller (not included in delivery). The alarm output can be configured to be used as a rpm signal to be connected to a fan connector with fault detection (for example motherboard fan headers) or to be used as a switched output for example to connect a LED. Flow signal, water temperature and external temperature sensor input can be configured to raise an alarm.
Scope of delivery:
One flow sensor
One internal USB cable
One aquabus/rpm signal cable (3 pins)