I am using the Javelin CS-300, but the Z total only brings the grant total since the machine started. I can't work out the daily total. Is there any solutions??

appreciated for any helps.

The grand total is not used for daily analysis. It is there for security reasons in case staff take sneaky Z reports for example. you would still be able to see the amount in the GT.

There should normally be a net total somewhere in the printout. That is your turnover (with refunds and corrections accounted for)