How do I use a Read-only field?

As of version 5.4, there is a Read Only option when creating a Custom field. The purpose of this is that only entries from barcode readers and wedge inputs from balances, for example, can be entered into the field. A wedge input is a direct connection emulating keyboard entry from an instrument such as a balance/scale. A wedge emulation can be from any serial/USB equipment like barcode, balances, etc
WIth a barcode reader you just need to click on the field in the form and scan the barcode.
With a balance, you click on the read-only field and then press the weigh button on the balance to register the weight.
Anything typed manually into a Read Only will not be saved in the field.

The following gif shows an example of a barcode-reader being used to input data into a Read Only field.

For more information on Custom Fields please see KB-custom field types and KB-Create custom field 5.2v.