https://www.systerra.de/ioLogik_R2140.html
The ioLogik R2000 series was designed for system integrators to acquire and control remote digital and analog devices over RS-485 ...
ioLogik R1210 Datasheet (PDF)
https://www.systerra.de/downloads.php?dokument=4605
ioLogik R1210 Datasheet (PDF)
https://www.systerra.de/downloads.php?dokument=4607
ioLogik R1210 Datasheet (PDF)
https://www.systerra.de/downloads.php?dokument=4609
https://www.systerra.de/downloads.php?dokument=8491