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in fact in you vidéo you have 3 VTH1550CH with old firmware, this firmware doesnt works with VTO3211, you need the last firmware for VTH1550CH or use VTH5211CH who use the good firmware.
...That almost sounds like that the VTH1550CH might not be 100% compatible with the new? VTO3211? Mhmhmhmhm... or is it just a matter of the firmware?
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you can add with the interface or remote with Smart PSS
...so you can issue/deissue cards at the intercom or some Smart PSS !?
Thanks,
INT