PiXtend eIO Hardware Manual
In the last step, we activate the bus terminating resistor at the last bus node of the line
structure. In our setup, this is the PiXtend eIO Digital One. At the other end, the bus
master (USB RS485 dongle), we have already attached the plug of the cable set with
integrated terminating resistor.
For PiXtend eIO Digital One only the switch "T" has to be switched to "ON". Now
everything is ready to work with the devices.
Commissioning with software - in the first step with a small test program - can be found in
the software manual for PiXtend eIO for several platforms.
Note!
If you want to work with your own connectors and cables then this is
possible. Make sure that the GND cable is also connected in any
case. The ground reference between the eIO devices and the
computer must always be established. Especially if it is a laptop
computer. Without a reliable GND reference, transmission errors or
non-transmission may occur.
If the digital outputs of the PiXtend eIO Digital One are to be used in this configuration,
then the supply connections of the outputs must also be wired. Further information can be
found starting on page 94.
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Figure 29: Test setup - PC with USB-RS485 dongle as master