How to read input register over 65535 ?

hi,

i have problem about read input register. i made program labview to monitoring Counter ( made by Autonics ),

my problem is when the counter is counting over 65534, suddenly on my program read 65535 = 1

for example

65535 = 1

65536 = 2

65537 = 3

65538 = 4

etc

is that the maximum read input register ? or its a bug from modbus library ? i`ve changed the representation v16 to v64

any solution ? please help me  to read input register over 65535

thanks