I thought it might have been a lack of IP address in the TCP Modbus connector so did a rebuild. However, it started working before I changed it so perhaps the install did not complete correctly the first time around. Oh well, a somewhat frustrating amount of time wasted :)

Hello @viestivelho, 1Wire has only one data pin from its design, and that is pin 7 on the master = the UniPi. Besides that we use another wire, pin 6, to serialize the bus as much as possible to maximize the reliability. That pin is wired only in the temperature sensors and HUBs which we provide.

Hello @M-Musel, I think this is not possible. Digital inputs are connected directly to the GPIOs of RPi's processor. You might be able to control only Relays/Ai and 1Wire but the rest will not work - I am also not sure if there are any I2C devices in the Pi-Top so you would have to make sure the addresses would not colide with I2C devices on UniPi. You also cannot connect two UniPis together via the I2C