Scanning Lexmark and Sharp Printers

Scanning Lexmark and Sharp Printers

When scanning Lexmark and Sharp Printers(many different models) using SNMP it does not retrieve the Device Serial Numbers and the CI Name from the Sharp Printers.
Is there a way to get this information. It works for the HP printers we have.
Here is a screen shot of 1 of the Lexmark and 1 of the Sharp printers we have.






Thanks