Messages On Reciept - VeriFone Vx510 Instructions For Use Manual

POS terminal Vx510
In case of unsuccessful communication terminal may print respective messages:
No answer
Carrier signal interrupted
No COM
REJECTED
Incorrect data received
Wrong answer received
Answer not received
CR answer only
No answer
NAK 3 times
Cannot open modem
Cannot initialise modem
Modem's time limit
No answer
Busy

14.2. Messages on reciept

It means, that the centre do not sent answer to card authorisation.
Repeat operation again!
It means, that communication problems appears during
authorisation session. Repeat operation again!
It means, that the authorisation center do not answer on address of
authorisation center. Call Processing center!
Authorisation declined. Try again or follow to corresponding
explanation on this or next chapter.
Problems with data exchange session, try again, if this persists, call
the card service center.
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Instructions for use