JVC 250 - Manual (Page 180)

Chapter 8---Software and Protocol
Model 250 Service Manual 8-13
*The Arrow keys are a sequence of Decimal or Hex numbers representing the
sequence of Escape, Left Bracket, and A, B, C, or D depending on which arrow Is
pressed. The first number represents the Escape key, the second number
represents the Left Bracket, and the third number represents the letter
corresponding to the Arrow Key pressed.
**Refer to Section 8.1, Software Updating.
***Must be done for a software change or port configuration change (device,
speed) to take effect.