Pitney Bowes DM230L User Manual

You can have the control centre display warn you when you enter a  
postage value that is higher than the preset amount. This feature prevents 
you from accidentally printing a postage value that's more than you need. 
The high value warning is factory set at $1.00. To change it:
1.  Press the Options key.
2.  Select Setup Menu, then Basic Settings then High Value Warning.
3.  Key in the value you want, including the digits to the right of the  

decimal point. For example, to set at $2.50, key in 2, then a decimal 
point, then 5.

5.  Press Enter. The display shows the value you entered.

NOTE: Due to new mail processing requirements in Canada, specifically to  
key-in postage and the requirement of using the internal rating feature for all 
mail transactions the High Value Warning is no longer functional. The internal 
rating feature ensures that all mail pieces are rated accurately and therefore  
the high value warning will not be triggered for any set high value.

The system tells you when the postage remaining reaches a certain level. 
This amount is set at the factory. You can change it as follows:
1.  Press the Options key.
2.  Select Setup Menu, then Basic Settings then Low Funds Warning.
3.  Key in the value you want, including the digits to the right of the  

decimal point. For example, to set at $2.50, key in 2, then a decimal 
point, then 5. 

4.  Press Enter. The display shows the value you entered.

You can specify values so that when your postage funds drop below a  
certain level, or if you try to enter too much postage for a piece of mail,  
the system displays a warning.