MSR Action, POS Command
This field specifies the action of the magnestrip reader when the command is run.
The options are:
Empty - The command has no effect on the status of the MSR.
Enable - The command enables the MSR. This is recommended if the command requires input from the
MSR.
Disable - The command disables the MSR. This is recommended if the command requires input from,
and enables, another device.