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solmoller / eversolar-monitor

Script to capture data and create statistics from Eversolar/zeversolar Solar Inverters. Includes easy install image files for Raspberry Pi. Working edition since 2012 :-)
https://github.com/solmoller/eversolar-monitor/blob/wiki/Introduction.md
MIT License
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Rs485 2 wire #44

Closed phoenix-blue closed 4 years ago

phoenix-blue commented 4 years ago

Hi,

Not really an issue but an question. Is it possible to use an 2 wire RS485 connection in place of an 4 wire RS485 connection?

kiekerjan commented 4 years ago

Yes, this is possible. You need to connect pins 1 and 3 on the inverter to TX on your wire rs485 connector and pins 2 and 6 to RX. In case the inverter replies with something like

**95 55 ff ff ff** df f7 ff fd d7 00 95 55 ff ff ff df ff ff fd df 00

that is, ff instead of 00, the polarity is inverted and you should switch tx and rx. See also here https://github.com/solmoller/eversolar-monitor/blob/wiki/Hardware.md

For more information, look at figure 3 here http://www.bb-elec.com/Learning-Center/All-White-Papers/Serial/RS-485-Connections-FAQ.aspx