KEYENCE N-400 - Manual (Page 108)

Chapter 5 Multi-Head Mode Control Procedure
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The following table shows the actual minimum scan time for each baud rate setting.
• Scan OFF time (M)
When the interference suppression function is used, a time lag occurs between the
scan of one BL series and the next. During this period, the BL series cannot read
bar code data.
• Scan cycle time (N)
The cycle time between the scan of one BL series and the next BL series is in-
creased when the number of connected BL series is increased or when the trigger
ON time is prolonged.
To reduce the scan cycle time (to scan bar codes on a high-speed line), reduce the
number of connected BL series or shorten the trigger ON time.
The scan cycle time can be calculated from the following formula:
N = (L + M) n * n = Number of connected BL series
Note: When the interference suppression function is used, the reading operation is
not applicable for a high-speed line because the scan OFF time of each BL series
is prolonged.
Baud rate (RS-485) Actual minimum scan time (L)
9600 bps 141 ms
38400 bps 58 ms
Baud rate (for RS-485) Scan OFF time (M)
9600 bps 36.5 ms
38400 bps 14.8 ms