opto engineering LTDVE4CH-20, Инструкция по эксплуатации

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13
LTDVE4CH-20 | INSTRUCTIONS MANUAL
Pin number Name Description Note
12 D- RS485 data signal. Negative terminal -
13 GND RS485 reference ground -
25 D+ RS485 data signal. Positive terminal -
Table 9: pinout of serial interface in connector P4
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 10: pinout of external temperature sensor in connector P4 . The two
terminals can be connected freely to the external thermistor, as the component is not polarized.
Pin number Name Description
11 NTC1 Temperature sensor terminal 1
24 NTC2 Temperature sensor terminal 2
Table 10: pinout of external temperature sensor in connector P4
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 11: 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
Power and logic supply 1.5 15 5
Light output 0.75 18 5
Synchronization inputs 0.25 24 5
Synchronization outputs 0.25 24 5
Serial RS485 interface 0.25 24 5
External temperature sensor 0.25 24 5
Table 11: cable wire size and length