LTDVE8CH-20 – INSTRUCTION MANUAL
16
8.4.3. Serial RS485 interface
The serial interface is available on the D+, D- and GND terminals of connector P6. These signals are
listed in
Table 11: pinout of serial interface in connector P6
. Be careful not to cross-connect the serial
interface signals.
Pin number
Name
Description
Note
12
D-
RS485 data signal. Negative terminal
-
13
GND
RS485 reference ground
-
37
D+
RS485 data signal. Positive terminal
-
Table 11: pinout of serial interface in connector P6
The interface is electrically isolated. Note that GND is not the same as 0V.
8.4.4. External temperature sensor
The controller allows for the connection of an external temperature sensor. The intended temperature
sensor is a NTC (Negative Temperature Coefficient) thermistor with coefficients R
25
= 10 kΩ and
B
25/85
= 3610 K. A suitable component is the Vishay NTCS0603E3103FMT.
The signals are listed in
Table 12: pinout of external temperature sensor in connector P6
. The two
terminals can be connected freely to the external thermistor, as the component is not polarized.
Pin number
Name
Description
17
NTC1
Temperature sensor terminal 1
36
NTC2
Temperature sensor terminal 2
Table 12: pinout of external temperature sensor in connector P6
These two analogue signals are not electrically isolated from the controller electronics. Be careful not
to connect them to any other signal. A malfunction or short circuit may occur.
8.5. Cable size and length
The actual connecting cables must be chosen on the basis of their load sinking current, the length, the
working voltage and the cable materials characteristics. Special ambient conditions may further
restrict the choice to a specific kind of cable.
The
Table 13: cable wire size and length
lists the recommended wire sizes and maximum allowed
lengths for all the cables coming to and leaving from the controller. American Wire Gauge (AWG) is
the wire measurement system used by the United States and Canada, while mm is the metric system
of measurement used across Europe and in most of the world.
Port
Recommended wire size
Maximum length [m]
mm
2
AWG