ZD-985 and ZD-8925 Desoldering station connector pinouts

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Im trying to find the pinout for the ZD-552B desoldering gun, which is the one used with the ZD-985 station. The ZD-552B has a 7-pin connector. There is also a ZD-552A desoldering gun which has only 6 pins.

Im also looking for the pinout for the desoldering gun ZD-553R, which is used with the ZD-8925 desoldering station. That one has a 6 pin connector.

So far i have only found some pinout for another desoldering gun, i think it was the ZD-552A.
So if somebody knows the pinouts for these two desoldering guns (ZD-552B and ZD-553R), or for one of them, i would really appreciate it if you could post the pinouts.
Thanks in advance.