What does a "PHILIPS PM 2101/021 / PM2101/021, Fluke interface unit" do?

[cowasaki]

Just searching for something else and a load of these came up at £30-50 and I can't read German

[Kjelt]

I can't read the invisible URL you posted? to look and translate it for you 

[cowasaki]

I can't even find the page I found earlier.  None of the adverts etc actually say what it is although I gather it is some kind of interface to allow external control of other things over GPIB....

[glarsson]

It's a IEEE/IEC interface for some instrument. The back has connector for GPIB (IEEE) and power connector (IEC). The instrument sits on top of the 2101 and connects through a female DE9 connector mounted on top of the 2101. I doubt they route 230V through the DE9, so the 2101 must contain the power supply for the instrument.

[Kjelt]

It interfaces GPIB to a digital Philips system bus protocol called "system 21"
Never heard of it before must be very obsolete.