NCR 6932, User Manual, Page: 26 / 108

2-14 Installation
Electrical Environment
Parameter Symbol Min Max
Supply voltage to keyboard V
IN
4.75 V 5.25 V
Supply current to keyboard I
IN
500 mA
Supply voltage to USB Port V
OUT
4.75 V 5.5 V
Supply current to USB Port I
OUT
100 mA
Note: The user programmable speaker tone function on the USB keyboards is not
supported when the keyboard is connected to a standard PC. The standard PC keyboard
voltage tolerance is not sufficient to handle the extra power requirements of the
programmable speaker tone. Only the default key click and error tones are supported on
a PC.
Caution: Before plugging in the keyboard, make sure to turn off the PC or POS
terminal. “Hot plugging” can result in damage to the PC or POS terminal due to the
increased power requirements of the USB keyboards.