NDC BETA LaserMike LaserSpeed Pro 8500-4, Инструкция по эксплуатации, Страница: 68 / 348

4-20 LaserSpeed Pro 8500-4 Instruction Handbook: Interfacing with the LS8500-4
4.2.1.18 Measurement Direction Input (Pin 14)
This is an optically isolated input that can be used to externally control the Measurement Direction feature of
the LS8500-4. The input requires a voltage high (5 to 24V) to activate. The input level should be the same as
the voltage connected to the User V
IN
input (Pin 20) or 5V if there is nothing connected to the User V
IN
input.
+5-24V Input
Signal Ground
Optically Isolated Input Schematic
There are two ways to reverse the direction of the LS8500-4's measurements:
1. Modify the Direction Inversion setting with LaserTrak (or using the "A" serial
command )
2. Connect 5-24V to the Measurement Direction Input
Changing the Direction Inversion setting with LaserTrak to invert the direction has the same effect
as changing the state of this input.
Note : If the Direction Inversion setting is set to "R/- Directions" and the Measurement Di-
rection Input is high, they will cancel each other out and the LS8500-4 will operate in the de-
fault manner.
Direction Inversion
Setting
Measurement Direction Input LS8500-4 Direction
Normal Low (Disconnected or 0v) Normal
Normal High (5-24V) Reversed
Reversed Low (Disconnected or 0v) Reversed
Reversed High (5-24V) Normal
When the direction is inverted, the pulse outputs will reverse phase, causing any connected counters to count
in the opposite direction. The internal length will count down until it reaches zero and remain at zero.