Delta OHM HD2817T Series, Manual

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6. Terminal board description
The terminal board is located in the lower part of the instrument, protected against dust and
splashes by two doors: the first external, snap-locked, the second internal, fixed with two
screws.
Number Function Notes
1 – 2
Power input
When making the order, you can select the power supply
between 90...240Vac or 24Vac/dc
3 – 4 Alarm relay RL3
For the settings, please see the chapter “ Instruments
fitted with relay outputs ”
5 – 6 – 7 Working relay RL2
The relay can be associated to any quantity measured by
the instrument (relative humidity or correlated
measurements, temperature).
For the settings, please see the chapter “ Instruments
fitted with relay outputs ”
8 – 9 – 10 Working relay RL1
The relay can be associated to any quantity measured by
the instrument (relative humidity or correlated
measurements, temperature).
For the settings, please see the chapter “ Instruments
fitted with relay outputs ”
11 – 12 – 13
RS232C or RS485
serial connection The communication protocol selection (RS232C or RS485)
is performed by using the switch on the left of terminal
11. For the settings, please see the chapter “
Serial
communication and instrument network ”
Terminal RS232C mode RS485 mode
11
To be connected to TX line of
PC (pin 3 of connector DB9) To be connected to line
B (negative of the pair)
12
To be connected to RX line of
PC (pin 2 of connector DB9) To be connected to line
A (negative of the pair)
13
To be connected to GND line of
PC (pin 5 of connector DB9) To be connected to
GND line