Thermokon RDF-IR (LCD) RS485 Modbus

Application

The RDF-IR (LCD) is a flush-mounted sensor for surface temperature measurement in living spaces and offices. It utilizes infrared measurement to determine the average temperature over a circular detection area (optical detection range 80 ±5°). This allows for direct measurement of the surface temperature within the sensor's line of sight. When two IR sensors are used, the system can output individual temperatures or the average, minimum, or maximum value of both temperature signals, configurable via the Thermokon USEapp.

Type Overview

Flush-mounted temperature sensor with optional display - active BUS

• RDF-IR (LCD) RS485 Modbus

Safety Information - Attention

Warning: Installation and mounting of electrical devices (modules) must be performed by an authorized electrician. The device is intended for its designated use only. Unauthorized modification or alteration is prohibited. The modules must not be used in conjunction with devices that directly or indirectly serve human, health, or life-saving purposes, or whose operation could pose risks to people, animals, or property. Connection of devices with a power plug must only be done after the connection line has been de-energized!

Furthermore, the following apply:

• Laws, standards, and regulations
• The state of the art at the time of installation
• The technical data and the operating manual of the device

Disposal Information

The symbol of the crossed-out garbage bin indicates that the product or removable batteries must not be disposed of with household or commercial waste. Within the EU, you are legally obligated to dispose of the product separately and appropriately according to your country's national laws. Alternatively, contact your supplier or Thermokon Sensortechnik GmbH. Further information can be found at: www.thermokon.de

Product Testing and Certification

CE Conformity Declaration: Declarations of conformity for the products can be found on our website: https://www.thermokon.de/direct/categories/rdf-ir

Technical Data

Environmental Conditions Note: When multiple bus devices are powered by a 24V AC supply, ensure that all positive (+) operating voltage inputs of the field devices are connected together, and all negative (-) operating voltage inputs = reference potential are connected together (phase-synchronous connection of field devices). Reverse polarity of the supply voltage on one of the field devices will create a short circuit of the supply voltage through that device. The resulting short-circuit current flowing through this field device will cause damage. Therefore, pay attention to correct wiring.

Configuration

For communication between USEapp and USE-M/USE-L products, the Thermokon Bluetooth Dongle with Micro-USB is required (Art. No.: 668262). Commercially available Bluetooth dongles are not compatible.

Application-specific reconfiguration of the devices can be performed using the Thermokon USEapp. Configuration is done when the device is powered. The configuration app and its instructions can be downloaded from the Google Play Store or the Apple App Store.

App Stores:

• Google Play
• Apple App Store

User Notes

The Bluetooth Dongle clicks easily into the socket. When unplugging, please fix the plug-in card (option board) to prevent it from being accidentally pulled out.

The flush-mounted ceiling sensor is installed in a 26 mm diameter hole.

Application

RJ45 sockets

• Sensor 1 (Output Temperature 1)
• Sensor 2 (Output Temperature 2)

Base version expandable with a 2nd temperature sensor. Connection of 2 remote sensors is possible with a shielded RJ45 cable up to 10 m long!

Connection Plan

To switch the output voltage (0..10 V or 0..5 V) using jumpers, the display must first be removed from the circuit board. For daisy-chained RS485 cabling, connect both cable shields using the supplied 2-pole terminal as shown.

Voltage Output Selection:

• 0..5 V
• 0..10 V

Sensor 2 Connection:

• AO U2 Temperature 2* | 0..10 V
• AO U1 Temperature 1 | 0..10 V

Power Supply:

• PGND
• UB+
• -15..35 V = / 19..29 V ~

RS485 Cabling:

• A
• B

* Optional if Sensor 2 is connected.

DIP Switch Settings (Main Board)

DIP Switch Settings (Plug-on Board)

The Modbus address of the device is set via a 5-position DIP switch, binary coded in the range of 1...31. With address 0 via DIP, an extended address range (32..247) is available via USEapp.

Modbus Addresses

USE-RS485 Modbus Interface. For a detailed description of the Modbus addresses, please visit the following link: https://www.thermokon.de/direct/files/use-rs485-modbus-manual.zip

Dimensions (MM)

Diagram showing the dimensions of the sensor housing and its components.

Diagram Description:

• Main housing: 65 mm (length) x 85 mm (width) x 45 mm (height)
• Cable entry: 30 mm (length) x 28 mm (width) x 30.5 mm (height)
• Internal components: Various dimensions including 85 mm, 71 mm, 24 mm, 90 mm, 22 mm, 4.5 mm, 12 mm.

Accessories (Included in Delivery)

• Mounting base (Art. No.: 631228)
• Universal mounting set (Art. No.: 698511) - Includes cover screw + screw cover, 2 dowels, 2 countersunk screws, 2 lens head screws.

Accessories (Optional)

• Bluetooth Dongle (Art. No.: 668262)
• Cable entry M25 USE white, sealing insert 4x Ø=7 mm (Pack of 4) (Art. No.: 641364)