Termination resistors on Modbus?

SmartEVSE / Sensorbox-2

Sensorbox-2 will measure three phase current with CT's or a Smart Meter connection, and send this data to a SmartEVSE

13 stars 16 forks source link

Termination resistors on Modbus? #2

Closed PA1RB closed 3 years ago

PA1RB commented 3 years ago

The schematic of the SmartEVSE2 does not show termination resistors between A and B of the serial Modbus.

Distance between SmartEVSE and Sensorbox v2 in my case is appr. 50m and no problems in practice, but perhaps still a good idea to mount 100 Ohm termination resistors between A and B at both ends of the (Cat 5e) line?!

wbitholedotbe commented 3 years ago

It's always a good idea... But it has to be 120 ohm.