Hi,
I have purchased an EM540 for our 3-phase MP/II ESS. It has not arrived yet. It has to be connected via RS485 to our Cerbo GX. I read about a RS485/USB adapter. The VE.bus on the Cerbo GX is already a RS485 bus (MP's on it). So why not just crimp a cable instead of using USB?
Please clarify.
Thanks
Nicholas
According this https://github.com/victronenergy/venusgx-hardware/blob/master/VE_BBB_Cape_v0.80_released.pdf the VE.bus looks as if it has RS-485 in it. The SN65HVD72 seems to be a driver for RS-485.
Has anyone tested it?
EDIT:
This document clarified it: https://www.victronenergy.com/upload/documents/Technical-Information-Data-communication-with-Victron-Energy-products_EN.pdf
In fact it is RS-485 but the protocol running over the line is MK2/MK3 which I doubt the EM540 is speaking. So I guess a USB/RS-485 adapter is indeed needed.
VE.Bus isn't standard RS485. You can't connect the EM540 to the VE.Bus, you need to use the RS485 to USB adapter.
