Quick as a flash Malone came back with some useful technical information about cable part numbers to use, which whilst completely different from mine I was still pretty sure that my wiring was correct, and also made a comment that the second ALME channel on the first ALME is reserved for the remote support connection.
I'm sure in the past I've used this channel for a normal VDU connection, however, it was worth a try.
He was dead right. So, another useful lesson learned.
Thanks Malone for the valuable info.