Hi Martin,
POS POI terminals are a special case. I have it in writing, sat on my desk as I type this, that "secure protocol option" means that SSL v3.0 and TLS v1.0 must be disabled, and TLS v1.1 and/or TLS v1.2 must be enabled. The photocopied letter is addressed to our PCI partner from the PCI Security Standards Council. I'm afraid I'm going to take the PCI Security Standards Council's word for it on how to interpret the standard written by the PCI Security Standards Council.
Rob