turck TN-UHF LNX Series, Instructions For Use Manual, Page: 51 / 85

V01.00 | 2019/04
51
7.5.2 Setting DXP functions via script
A script is installed on the device for setting the DXP channels. The script is located under the
following path:
/usr/bin/dxp
The script can be used with the following syntax:
/usr/bin/dxp channel [value]
The following example sets the value for the DXP0 channel to ON.
/usr/bin/dxp 0 1
Parameter Possible values
DXP0…DXP3 1: Switch on channel
0: Switch off channel
7.5.3 Programming DXP channels with Python 3
NOTE
The speed of the data transmission depends on the configured block size and the
set transfer rate. The speed may possibly not be enough for time critical applica-
tions. To achieve faster data processing, the process can be set as a real-time pro-
cess.
The following example shows the programming of the digital I/O channels with Python 3.
import sys
#GPIOs-> OUT: IN:
ports = ["88","59"]
# write GPIO:
try:
# set direction to write DXP
fo = open("/sys/class/gpio/gpio" + ports[0] +"/direction",
"w")
fo.write("out")
fo.close()
# write GPIO:
f = open("/sys/class/gpio/gpio" + ports[0] +"/value", "w")
f.write("1")
f.close()
except:
# export gpio if not done as yet
f1 = open("/sys/class/gpio/export", "w")
f1.write(ports[0]) f1.close()
# set direction to write DXP
fo = open("/sys/class/gpio/gpio" + ports[0] +"/direction",
"w")
fo.write("out")
fo.close()
# write GPIO:
fw = open("/sys/class/gpio/gpio" + ports[0] +"/value", "w")
fw.write("1")
fw.close()