
LTDVE8CH– INSTRUCTIONS MANUAL
16
listed in the
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 the
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.
9. Communication interfaces
There are several ways to configure the controller.
A first option is to use the serial RS485 interface. To support this interface the controller implements
a subset of the Modbus/RTU (Remote Terminal Unit) slave protocol.
A second option is to use the Ethernet interface. Supported Ethernet speeds are 10 Mbit/s and 100
Mbit/s with auto negotiation. The Ethernet interface allows to configure the controller using the
Modbus/TCP (Transmission Control Protocol) slave protocol, the Modbus/UDP (User Datagram
Protocol) slave protocol or the HTTP (Hyper Text Transfer Protocol) protocol. For supporting the
latter, the controller provides an internal web server accessible by most common web browsers.
The Modbus/RTU, Modbus/TCP and Modbus/UDP protocols are implemented by most
programmable logic controllers (PLCs) with a suitable interface.
The availability of two physical interfaces and four logical protocols makes it easy to integrate the
controller in most vision applications.