Metrologic Instruments MS951 - Manual (Page 26)

D F 1
O C 8
O C 9
O C 7
H H 1
H H 2
Recall Defaults
21
KB Parameter - Inter Scan Code Delay
(AT and PS/2 Modes)
The time specified with an inter scan code ** 800 Microsecond Delay
delay bar code represents the amount of
time between individual 9 bit scan codes.
Each character of a bar code takes between
two and twelve of these scan codes to be
7.5 Millisecond Delay
passed through to the PC via the keyboard
interface. This parameter may need to be
adjusted for operation with certain PC key-
board BIOS’s. Network operating systems
15 Millisecond Delay
often use microprocessor time slices to ser-
vice network information requests instead
of the keyboard interface. While not an issue
with manually entered key strokes, this timing
can be critical with automatic scanner data
entry. Inter-scancode delays can be a useful
system tuning tool in these environments.
KB Parameter - XT - Clean-Up Bit
Some keyboard BIOS's require a "clean-up bit" to Enable Cleanup Bit
be transmitted prior to 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).
** Disable Cleanup Bit