PiXtend eIO Hardware Manual
Here we use a 3-pin cable with the following colors:
•
brown (BN) → Use as GND connection
•
green (GN) → bus signal A (D1)
•
white (WH) → bus signal B (D0)
In this design, it is irrelevant whether 2 or 3-pole cables are used. For 2-pin cables, the
GND cable is omitted. The current path for GND is given by the common power supply
and sufficient for the test setup. If the bus is to be Modbus compliant, use a 3-pin cable
with GND (C - common) and shielding.
The colors for the individual signals are not required. However, at Qube Solutions, we
always use exactly these colors (LIYY cable with DIN 47100 color coding). These can also
be found in the "PiXtend eIO eIO cable set" (chapter 4.5.1).
We start from the bus master (PiXtend V2 -L-) and here connect the control line with the
named terminals. At the other end of the wires, we plug in the first eIO device. From this
device we loop with the remaining piece of the control line 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:
PiXtend V2 -L-
Bus-Master
Line/cable #1
PiXtend eIO
Analog One
Line/cable #2
PiXtend eIO
Digital One
GND
brown (BN)
GND
(C)
GND
(C)
brown (BN)
GND
(C)
-
A
green (GN)
A (D1)
A (D1)
green (GN)
A (D1)
-
B
white (WH)
B (D0)
B (D0)
white (WH)
B (D0)
-
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