Brother HL-1260E - Manual (Page 156)

CHAPTER 4 CONTROL PANEL
4–89
4. Send data from your computer.
When the printer receives data, it starts printing hexadecimal values of
the received data.
To exit from the hex dump mode, follow these basic steps:
1. Press the SEL switch to set the printer off-line.
2. Reset the printer with the RESET switch.
Or turn off the printer, wait for a few seconds, and turn it on again.