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Horis User Manual
2.4.1
Static - Pst
The instrument must be connected to the static pressure source.
Static source is usually obtained from pressure sources located on
fuselage side surfaces or from the static port on pitot tube.
For the connection, use a tube with 4 mm inner diameter and about 8
mm outer diameter. Locate the existing tube, cut it at an appropriate
place and insert a T junction. Install a new tube from junction to
the instrument.
It is highly recommended to keep the static tubing as short as pos-
sible. The tubing must avoid sharp bends and twists. The tubing
must be airtight. Water must not be allowed to enter the tubing.
We strongly recommend labelling each tube before connecting to Ho-
ris or any other instrument. If you ever have to remove Horis from
the instrument panel, this will help a lot during re-installation.
Two standard plastic T junctions are included in the Horis package.
2.4.2
Total Pressure - Ptot
Total pressure connection comes from the pitot tube. Same principles
as with static connection apply.
2.4.3
CAN Bus
Connection to the CAN bus is optional and is not required for normal
operation.
When Horis is not connected to the bus, a terminator plug (Figure
7) must be inserted into one CAN connector. The terminator plug
is a plain RJ45 plug with 120 Ω resistor connected across pins 4 and
5, while pins 1,2,3 and 6,7,8 are not connected.
Figure 8 and Table 4 defines the pin out of the CAN bus.
18
2.4 Connections
© Kanardia 2021
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