MG/S 11.100.1.1: Can the Modbus/KNX Gateway be used together with a QA/S 4.xx.1 in the same Modbus RTU system?

No, both the Modbus/KNX Gateway and the QA/S act as clients.
Since Modbus RTU is a client/server protocol, this constellation would cause a conflict.

Tags: Gateway, KNX, Modbus