The printer must be online to accept data.
To set the printer online, press Start/Stop.
The Ready light comes on. If paper is not loaded, the Paper Out light blinks. When online, the printer is ready to receive print jobs.
To set the printer offline, press Start/Stop.
The Ready light turns off. The printer finishes printing the current line and then stops. To resume printing, press Start/Stop until the Ready light comes on.