KEYBOARD WEDGE (KB) INTERFACE (CONTINUED)
When this option is enabled, the scanner will duplicate this keyboard sequence: Hold down the Alt key; type the decimal number that corresponds to the appropriate keyboard character. Caution should be observed when using Alt mode because a scanner to host application conflict may occur if the host software application uses the Alt key as a “Hot” key.
H H 3
**Disable Alt ModeH H 4
KB Parameter - Inter Scan Code Delay (AT and PS/2 Modes) |
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The time specified with an interscan code | ** 800 Microsecond Delay | ||||||||||||||||||||||
delay bar code represents the amount of time | |||||||||||||||||||||||
between individual 9 bit scan codes. Each |
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character of a bar code takes between two |
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and twelve of these scan codes to be passed |
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through to the PC via the keyboard interface. |
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This parameter may need to be adjusted for |
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operation with certain PC keyboard BIOS’s. |
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Network operating systems often use | 7.5 Millisecond Delay | ||||||||||||||||||||||
microprocessor time slices to service network | |||||||||||||||||||||||
information requests instead of the keyboard |
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interface. While not an issue with manually |
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entered keystrokes, this timing can be critical |
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with automatic scanner data entry. Interscan code delays can be a useful system tuning tool in these environments.
15 Millisecond DelaySome keyboard BIOS's require a "cleanup bit" to be transmitted before an actual scan code being clocked over to the motherboard. Enabling this feature will cause the scanner to send this extra bit to the host computer. More commonly found on older XT style BIOS's, and some AT BIOS's. (required by some NEC 80286 machines).
O C 7
Enable Cleanup BitH H 1
** Disable Cleanup BitH H 2
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