I have a new Serial Tap i have purchased.
The purpose for this was to snoop on comms between my Goodwe AC Battery inverter - SBP5000 and the energy meter i comes supplied with the GM1000D.
I have a 3 phase house and these energy meters are single phase only - as are the batteries/inverters - so i have one connected to each phase of my house.
My plan is to have a raspberry pi talk to the 3 energy meters, request the data and then fool the Inverters into thinking they are talking to the meter by sendng back altered information that will ensure i end up with batteries that are evenly servicing the loads to ensure our grid import/export is Net Zero.
I have therefore disconnected one of the inverters from the Meter, connected it to the Serial tap - RS485 port and then created a new short lead to go from the RS485 on the Serial Tap to the Meter.
I was therefore expecting to see a continual stream of information - requests every 200ms from the inverter and then responses from the Meters.
The link speed and settings are well documented by Goodwe as 9600,N,8,1 which is what i have set in IO Ninja (V5) but i am getting continual framing errors.
If i disconnect the Serial Tap and instead put the inverter back to the meter they start communicating straight away.
Any pointers on this ?