ETC Expression 2.0 User Manual page 189

Chapter 7 Accessories 7 - 13
For RFU installation instructions see Chapter 2, Installation. RFU must be
turned Off before you install it . For instruction on installing a remote
monitor, see Installing two monitors on page 2 - 4.
To operate your installed RFU, move power switch to On . Expression
displays the message, RFU On on the screen.
The console keypad and RFU are able to operate simultaneously .
Changes made from both console and RFU are displayed immediately on
both console monitor and RFU .
You can control the majority of console functions with RFU; you cannot
control submasters, however .
Warning: Do not connect or disconnect the RFU when it is turned on.