"Roland Perry" wrote in message
news
In message , at 14:54:26 on Thu, 26 Jun
2014, tim..... remarked:
I am not sure what people expect but how is a card reader expected to
"know" which card to debit if you have a couple of contactless payment
cards in your wallet? (More of an issue on buses at the moment)

It certainly seems reasonable that the reader should be "intelligent" and
look for:

Freedom pass
Oyster with relevant season
Oyster with PAYG balance

before randomly selecting debiting your CC

Even if it can't (for whatever technical reason TfL can think of) actually
intelligently charge the correct card from the above list , it should
certainly decide not to charge the CC if one of the others is found.

It can't, and doesn't,

I know that it doesn't (that's almost a given)

but I don't see that it can't.

do all that in the short interval it has available.

So extending that window is a worse use of time that having pax stand at the
barrier for 30 seconds whilst he fusses about which card to use?

(OK I know, having stood behind that person [1], it only seems like 30
seconds but is probably nearer 10)

Even if the RFID interference between the different cards means you could
even read them individually.

there must be a possible process of conversing with only one card as
otherwise we would never get the scenario of writing to the wrong card. I
can't believe this always happens because only one card "wakes up"

tim

[1] he was trying to make his "paper" ticket work the contactless pad, after
3 tries I stepped in and told him he had to put that type of ticket in the
slot, at which point he announced that he actually though he was using his
freedom pass.