Logging solar panel production

Projects Programming
1

I have this kWh meter that records my production:

http://www.schukat.com/schukat/pdf.nsf/index/31F9485510BF4EE5C125755F00450AAE/$file/S7EEN.pdf (page7)

Can I simply connect the SO+ to the 5V and the SO- to a resistor and a digital pin of the arduino and then simply read it with a digital read? As shown here:

Is it that simple?
What value does the resistor have to be?

2

no,

check - Arduino Playground - EEM12L-32AKWhMonitoring - how I did it with a very similar KWH meter.