MX-FXX1 (serv.man5). Fax Guide (Supplied as pdf file on m c's Hard Disk Drive). - Sharp Copying Equipment User Guide / Operation Manual. Page 107

Before the F-code communication function can be used, special memory boxes must be created using "F-Code Memory 
Box" in the system settings for fax.
A box name and F-code (sub-address and passcode) are programmed in each box, and an F-code communication 
function is assigned to each box.
After you have created a memory box, inform the other party of the sub-address and passcode of the box.

To use the following F-code communication functions, F-code memory boxes must be created in your machine.

F-code confidential reception, F-code polling memory, F-code relay broadcast transmission 

To use the following F-code communication functions, F-code memory boxes must be created in the other machine.

F-code confidential transmission, F-code polling reception, F-code relay request transmission.

System Settings for Fax: F-Code Memory Box
This is used to configure memory boxes for F-code communication.

• Up to 100 memory boxes can be created.

• The memory box name cannot be longer than 18 characters, and the sub-address and passcode cannot be longer than 20 

digits.

☞

 (page 152), 

 (page 155)

• Memory box name
• Sub-address
• Passcode
• End receiving machines (only in an F-code relay 

broadcast memory box)

• Print PIN (only for F-code confidential reception)