As Tom points out, this will have a different resolution based on the type of host you are connecting to. To add to what Tom has mentioned
If the host is VT
There is an emulation parameter called Scan Terminator. You can find it under Emulation Parameters > Emulation > VT and HP > Common. The default value for this is \0D (Enter). If you wanted to use Tab you would change it to \09.
If you are using IBMHOST
You will want to set this with a Scan handler
The scan handler would look like
This would append every barcode with Tab. You can change the parameters from where we apply this to fit your need. This is also a valid solution for any other emulation type.