Hi, and sorry for the newbie question.

I have been given a box of GHL doser kit including the below and a couple of sensors and I am in need of advice.

GHL Doser 2 4fach, sw
GHL Doser 2 Slave, 4fach, sw
GHL Pofilux Touchscreen
GHL Expansion Box
GHL Dosing Unit Four (same age and design as the expansion box)

Neither of the two doser 2's have a USB port or ethernet port so logic would say they are both slaves despite only one being marked as a slave. Connecting the PAB connection to either of the doser 2's or the expansion box brings about them showing on the Profilux Touchscreen. Chaining the devices with PAB neither brings back a connection either.

I've searched the forum and google etc with no joy on what the 'GHL Doser 2 4fach, sw' device is.

Guessing the 'GHL Doser 2 4fach, sw' is not a standalone device due to the lack of USB port or those shown in the manual so assuming I need to either purchase a doser 2 stand alone or a profilux 3 or 4 to control the dosers?

So please if someone could point me in the right direction I would be so thankful.

Sorry for the newb, question.

Regards, Starmonkey77