Installation - Vector OPA2-MOD Manual

Security Advise
This device is intended to be used for comfort applications. Where a device failure endangers human life and/or property,
it is the responsibility of the owner, designer and installer to add additional safety devices to prevent or detect a system
failure caused by such a device failure. The manufacturer of this device cannot be held liable for any damage caused by
such a failure.
Failure to follow specifications and local regulations may endanger life, cause equipment damage and void warranty.
Connection diagram
Note:
Power GND ≠ Modbus common!
Line polarization:
The device needs line polarization. This should be done
at the master device only.
Each a 680 ohm resistor should be connected between
D0 and RS485 COM and D1 and RS485 5V.
Terminal description:
1 0V
2 24V
3 DI1
4 DI2
5 RT1
6 D0(A)
7 D1(B)
8 GND ISO
Mounting location
 On an easy accessible interior wall, approx. 1.5 m (4.5') above the floor in an area of average temperature.
 Avoid exposure to direct sunlight or other heat sources, e.g. the area above radiators and heat emitting electrical
equipment.
 Avoid locations behind doors, outside walls and below or above air discharge grills and diffusers.
 Location of mounting is less critical if external temperature sensors are used

Installation

1. Connect the wires to the terminals of the power case according to wiring diagram
2. Install the mounting plate to the flush mounting box. Make sure that the nipple with the front holding screw is
facing to the ground. Verify that the mounting screw heads do not stand out more than 5 mm (0.2") off the
surface of the mounting plate.
3. Slide the two latches located on the top of the front part into the hooks at the upper side of the mounting plate.
4. Carefully lower the front part until the interconnector reaches the mounting-plate. Continue pressing in a gentle
way until the front part is fully connected. While inserting the connectors, a slight resistance can be felt. This is
normal. Do not use excessive force!
5. With a Philips-type screw driver of size #2, carefully tighten the front holding screw to secure the front part to
the mounting plate. This screw is located on the front lower side of the unit. There is no need to tighten the
screw too much.
Doc: 70-00-0290, V1.0 R0, Date: 20160208
Subject to alteration
On last node on either end of bus only
connect 120Ω termination resistor between A and B (D0 and D1)
Power supply:
Power supply:
Passive input:
Passive input:
Passive input:
RS485 A:
RS485 B:
RS485 Com
24V
2
1
0V
Modbus Common
Modbus D0 (A or -)
Modbus D1 (B or +)
0V; common for power supply
24V AC or 24V DC
Binary input, keep open or switch to 0V
Binary input, keep open or switch to 0V
NTC 10kΩ @ 25°C (77°F) or open contact
Modbus A or -
Modbus B or +
Modbus Reference
© Vector Controls GmbH, Switzerland
OPA2-MOD(-H)
Technical data
DI1 DI2 RT1
3 4 5
OPA2-MOD
6 7 8
D0 D1 GND
(A) (B) ISO
Balanced pair
120Ω
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