How to Make the CAS Modbus Scanner Read A Modbus 6 Digit Address (JBUS)

The older Modbus systems limited the number of objects of each type to 9999.

For example, Max Input Register = 39999 and Max Holding = 49999

Whereas the protocol has space to read up to 65535 objects of each type, older Modbus systems imposed a stupid validation and choked the address space to a limit of 9999. Newer systems, like the CAS Scanner, do not choke the address space, and you can read any registers.


To read address Holding Register = 512345   (also known as Holding Reg with offset 12345 in PDU terminology)

Display of the request – we show both the 5 and 6 digit address.

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