*IT6922B/IT6932B/IT6942B/IT6952B/IT6953B have standard RS485 
communication interface and external Analog control Interface. 
2.2 Introduction to front panel 
The front panel of IT6900 series is shown in the next figure. 
 
 
1.  VFD display 
2.  Rotary knob 
3.  Compound key, the local switch key and power switch 
4.  Number keys and ESC 
5.  Function keys 
6.  UP/DOWN/LEFT and RIGHT key, to move cursor 
7.  Output terminals