USB Interface 5 - 15
USB Transmission Speed Parameters
Use the following parameters to speed USB data transmission:
•
USB Polling Interval - When using more current USB systems, use this parameter to set a lower interval
in order to increase data transmission speed.
•
Fast HID Keyboard - When configured as a USB HID keyboard device, use this parameter to increase
the data transmission speed of printable (7-bit) ASCII characters.
•
Quick Keypad Emulation - When configured as a USB HID keyboard device, use this parameter to
increase the data transmission speed of a mix of both printable (7-bit) and full (8-bit) ASCII characters.
USB Polling Interval
This option speeds data transmission for all USB devices except CDC. Scan a bar code below to set the
polling interval. The polling interval determines the rate at which data can be sent between the scanner and
the host computer. A lower number indicates a faster data rate. The default value is 8 msec.
Changing the polling interval re-initializes the scanner.
NOTE Enabling Emulate Keypad on page 5-12 or Quick Keypad Emulation on page 5-17 overrides Fast HID
Keyboard.
CAUTION Ensure the host can handle the selected data rate. Selecting a data rate that is too fast for the host can
result in lost data.
1 msec
2 msec
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