Update installation instructions with communication settings

Added baudrate, parity, and modbus address information.

Author: mstegen

docs/installation.md

@@ -20,7 +20,11 @@ If your meter is not listed, you might be able to use the Custom option in the m
 Connect the A and B of your meter to the A and B terminals of the SmartEVSE.<br>
 Note that the ABB and Carlo Gavazzi meter have the A/B signals reversed, you should connect A to B, and B to A on these meters.<br>
 You can use Cat5 network cable for the wiring between SmartEVSE(s), kWh meter(s) and Sensorbox.<br>
-Make sure to use one twisted pair for A and B, so for example A=Green, B=Green/White
+Make sure to use one twisted pair for A and B, so for example A=Green, B=Green/White<br>
+<br>
+The baudrate is 9600 bps<br>
+The parity should be set to NONE<br>
+As address 1-10 are reserved for SmartEVSE communication and the Sensorbox, make sure to set the modbus address of the Mains or EV meter to address 11 or higher.<br>
 
 # Inverted wiring of kWh meter
 If you are using a 3 phase Eastron kWh meter, you can feed it from below (like in most Dutch power panels). Now the polarity of currents is reversed, so in the MainsMeter or EVMeter configuration you should choose kWh meter type "Inverted Eastron".