This FAQ is for xtender and vario series.
The order of the devices is very important in the Studer communication bus for a good performance of the system.
Inverters and solar chargers are powered by batteries. Accessories, instead, are powered by the bus cable. Bus cable is formed by 8x wires, and 4 of these wires carry power provided by xtender, variotrack or variostring devices to accessories.
If you connect an accessory between, for example, two xtender, both devices are going to power the accessory, and this could cause it to malfunction.
So, it is important to not connect an accessory between two inverters/solar chargers.
Please, follow these rules:
- No accessories between xtender, variotrack or variostring.
- xcom LAN/GSM must be connected at the end of the bus and directly to an xtender/variotrack/variostring. Try to avoid connecting any accessory in between, because xcom LAN/GSM requires more power due to the modem.
- bsp is an exception. It is the only accessory powered by batteries. Anyway, it is recommended to connect it at the end of the bus.
- If xtender, variotrack or variostring fails, they will not power any more accessories on its side of the bus, and therefore these accessories will be disconnected from the system.
- Each device has two RJ45 connectors; you can connect the cables to any of them.
- All devices have an End Bus switch. This switch must be set up properly depending on location of each device in Studer bus. The devices at the end of the bus must have this switch in T position.
To confirm that all the devices are properly connected and communicating. Please go to System Info screen in rcc and check System Info Summary. If there is some device missing, it means that there is a problem in the communication bus or the device may not be powered.