Laser beta lasermike LS8000-3 - Manual (Page 142)

LaserSpeed 8000-3 Instruction Handbook
RS-232/RS-422 Communication
Part No. 93463 / Drawing No. 0921-01561 Page 142 of 221 Revision A (Sep 2007)
Indicates when the current length has exceeded the Length Threshold A set point. This
output is reset when the Index Pulse resets. See the
Index Pulse & Length Thresholds
section for details about length thresholds.
Voltage High: Length Threshold A Exceeded
Voltage Low: Length Threshold A Not Exceeded
Y
Index (OPR) Pulse Length
Y
Read
Response Format:
Y
Set
is an integer from 0 to 255 that is the length of the Index (OPR) pulse in 10ms
increments.
Example:
You want to set the OPR Pulse length to 180ms.
Y = 180ms/10ms = 18.
Command: Y18
The time that the pulse is asserted does not vary with the measured velocity. When setting
this value, be sure to set the pulse length to a value less than the time that will elapse
between OPR pulses.
!
Index Pulse (OPR) Setting
!
Read
Response Format:
!
Set
is an integer specifying the number of User Scaleable Pulses per Index Pulse.
Range: 1 to 999,999,999
Example:
Assume that the User Scaleable Pulse Rate (configurable with the P command) has been
set to 1,000 pulses/foot.
To get an index pulse every 10 ft:
!
= User Scaleable Pulse Rate (pulses/ft) x Desired Index Pulse Spacing (ft)
!
= (1,000 pulses/ft) x 1 ft = 1,000 pulses
The command to set the correct value is !1000
To get an index pulse every 0.5 ft:
!
= (1000 pulses/ft) x (0.5 ft) = 500 pulses
Command to set the correct value: !500