UP-3300 (serv.man6). UP3300 Handy Guide - Sharp EPOS Handy Guide. Page 7

Q. Is it possible to have some kind of control on the MANAGER
SCREEN key?

A.  The answer is to create an AUTO KEY, which would be
REFUND, MANAGER SCREEN, CLEAR. (This would take the
place of the existing MANAGER SCREEN KEY)
Make the REFUND or RETURN KEY limited (only for MANAGER)
Allocate a MGR # key to main screen
Finally create a MANAGER with a secret password.
The operation would then be to enter MGR CODE then enter
SECRET CODE you could then press the auto key
To return back to REG MODE the operator would then press the
MGR # KEY.

Q. Can there be a MASTER/BACKUP MASTER on two till system.

A. Yes it works fine.

Q. Is it possible for PLUs to be sent to the Kitchen Printer from
one machine in a network but not from another.
For Example the MASTER MACHINE wants PLU 1 & 2 to go to
KP1 and KP2
However the SLAVE MACHINE wants PLU1 to go to KP1 but PLU
2 not to print from this machine.
(When All Presets are downloaded to each machine in the network
the SLAVE Machine’s PLUs will be set to sends to both KPs.
As the Slave Machine does not have KP2 assigned in the above
example the PLUs will be printed on the Receipt Printer.

A. There is a solution if you have a spare RS CHANNEL.
In the above example you set up KP 2 from the Slave to go to an
unused channel, then on that channel fit a 9-pin connector with
pins 4 and 6 shorted together.