MSView MODBUS PS-MPPT-40M Chargery Samlex

[Viron]

I'm getting ready to roll my first Lifepo4 battery with a Morningstar PS-MPPT-40M charge controller, Chargery BMS, and Samlex PST-3000W 24V inverter. I pleasantly found out I can use PIN 3 of the Samlex to switch the inverter on with 4.8milliamps at 24V! Yippee!

I can use the low current relay voltage from the Chargery to cycle the power off on the Samlex for BMS faults. Yeah!

I'm looking for a similar low current solution to turn off the PS-MPPT-40M charge controller. Morningstar suggested looking at MODBUS "coil settings." MSView is the MODBUS programming interface that MorningStar uses.

Does anyone have an idea of which MODBUS parameter I should program. It seems to me I could use either a low voltage value from the low current relay from the Chargery BMS, or high voltage value from the Chargery BMS alarm output to feed a "coil setting" that would trigger a shutdown of the PS-MPPT-40M.

Does anyone have a suggestion of what parameter in MODBUS or MSView to use? My next step is to go through the MSView ProStar MPPT and RD-1 relay driver wizards to get hints.

I'm sure someone has some insights.

Thanks.

 

[boopz]

Modbus is used over RS485 which is essentially a serial networking protocol. You have to have some kind of equipment capable of talking RS485 to then query or set values on the end device.

You can simply use a laptop with a USB RS485 adapter to send commands. Obviously this isn't usable so you could use a Raspberry Pi or arduino to to that part. The next part would be telling the device to do it. You'd either have to have a button or setup some kind of automation on something like Home Assistant or nodeRed.

I'm currently trying to do a similar thing by using MQTT to get values from an RS485 interface and send into Grafana and Home Assistant