Chapter 3: Installation 3-5
USB Keyboard Wedge Communication
The 7893 can emulate a USB keyboard device by enumerating itself as an HID keyboard. By
doing so, it passes barcodes directly to the host’s keyboard driver. This eliminates the need of
installing a third party driver since the operating system’s native keyboard input driver will be
used.
Programmables
1. Enable USB keyboard Communications Interface
Programming Mode + 1 + 0 + E + 3
2. Inter Character Delay
4 ms: Programming Mode + 2 + 8 + D + 0
8 ms: Programming Mode + 2 + 8 + D + 1
16 ms: Programming Mode + 2 + 8 + D + 2
32 ms: Programming Mode + 2 + 8 + D + 3
64 ms: Programming Mode + 2 + 8 + D + 4
1 ms: Programming Mode + 2 + 8 + D + 5 (New for this release, new default value)
3. Start and Stop Sentinel, maximum of 9 bytes each
Disable: Programming Mode + 2 + 9 + 0 (zeros all start/stop entries)
Start Sentinel: Programming Mode + 2 + 9 + 1 + DATA + End
Stop Sentinel: Programming Mode + 2 + 9 + 2 + DATA + End
DATA Input: Enter each byte as 2 nibbles
Example: Start Sentinel = 0x31, 0x21, 0x2D (0x31 will be transmitted first)
DATA Tag Sequence = 3 + 1 + 2 + 1 + 2 + D
Tag Message Format
The Tag Message will consist of the following:
Start Sentinel – 0 to 9 bytes
Tag Identifier – 1 byte
Tag Data – Variable, depending on the scanned tag
Stop Sentinel – 0 to 9 bytes
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