Dear Henk,
The communication of our software with the RS485 USB converter requires our special converter because we need some special features in the hardware and use a higher speed which is not supported by all the various converters in the field.
Seriel numbers have been introduced to be able to follow up changes.

Best regards

Jürgen Breitlow
Director Research and Development

Georg Neumann GmbH l Ollenhauerstr. 98 l 13403 Berlin l Germany