Epson TM-T88V Technical Reference Manual page 16

Pairing method when the security is set to Middle/High (from the printer)
When the security is set to Middle or High and the printer is ready to be paired, perform the following proce-
dure.
1
Turn on the printer and wait for about seven seconds.
2
Hold down the push button for at least three seconds.
3
A status sheet is printed, and the LED on the interface board flashes a pattern indicat-
ing that pairing is now possible.
Pairing method when the security is set to High (from the host)
When the security is set to High and the printer is ready to be paired, perform the following procedure.
1
Search for the printer on the Bluetooth settings screen on the host device.
2
Select the printer you want to pair with.
The printer prints the Passkey.
3
Check that the printed Passkey and the Passkey displayed on the host device match,
and then select "Pairing" on the host device.
16
Pairing is possible for one minute after printing the status sheet.