I have the following configuration for DIO0 and DIO1 as quadrature inputs:
MB.W(44000, 1, 0) --disable DIO0
MB.W(44002, 1, 0) --disable DIO1
MB.W(44100, 1, 10) --set DIO0 index
MB.W(44102, 1, 10) --set DIO1 index
MB.W(44000, 1, 1) --enable DIO0 for phase A
MB.W(44002, 1, 1) --enable DIO1 for phase B
I'm using FIO0 for phase A and FIO1 for phase B connections on the labjack T7-Pro and I'm trying to measure (count) the rising and falling edges of both pulses. I'm able to count the rising edge on phase A but not the falling edge.
I use this register to read the count:
phaseACount = MB.R(3000, 1) --read DIO0 phase A count
How do I read (count) the falling edge of the pulse on FIO0 which is my DIO0? I'm using LUA.
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I ran a quick test with the below script and encoder: HRPG-ASCA-#16R
MB.W(44000, 1, 0) --disable DIO0
MB.W(44002, 1, 0) --disable DIO1
MB.W(44100, 1, 10) --set DIO0 index
MB.W(44102, 1, 10) --set DIO1 index
MB.W(44000, 1, 1) --enable DIO0 for phase A
MB.W(44002, 1, 1) --enable DIO1 for phase B
LJ.IntervalConfig(0, 500)
while true do
if LJ.CheckInterval(0) then
count = MB.R(3000, 1)
print(count)
end
end
The result counts up and down as expected.
The LabJack is using 4x decoding. Every edge is counted and two successive edges on the same line are considered a change in direction. Here is a pretty good description: http://www.creative-robotics.com/quadrature-intro
Thank you, I appreciate the quick response. It worked.