PiXtend eIO Hardware Manual
The two eIO devices are powered by a common power supply. We connect each 24 V and
GND directly from the power supply or a common terminal block to the devices. We do not
recommend further looping of the supply - from one device to the next (further information
in the chapter
The USB dongle is powered by the USB port of the computer being used.
Now the bus lines can be connected. The cable set makes it particularly comfortable and
easy. The adapter included with the USB dongle is not needed. If this is already plugged in
on the dongle, remove it and set it aside.
The longer cable from the cable set has a D-SUB 9 socket at one end. This can be
connected directly to the USB dongle.
At the other end of the wires, we connect the first of the two eIO devices. From this device
we loop - with the shorter cable from our set - on to the second eIO device. The bus
connections on the eIO modules are doubled - this results in the required line structure of
the bus and a simple and quick setup. It does not matter which connections are used as
"input" and which as "output".
In our example, the wiring now corresponds to the following table:
USB RS485
bus master
Line/cable #1
PiXtend eIO
Analog One
Line/cable #2
PiXtend eIO
Digital One
Pin 5 D-SUB 9
socket of
the cable
set
brown (BN)
GND
(C)
GND
(C)
brown (BN)
GND
(C)
-
Pin 2
green (GN)
A (D1)
A (D1)
green (GN)
A (D1)
-
Pin 1
white (WH)
B (D0)
B (D0)
white (WH)
B (D0)
-
The structure is graphically shown in the following Figure 29:
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