Temp-485 Box2
€108.50
The RS-485 temperature sensor for large, distributed measurement networks
The HW group Temp-485 Box2 is an indoor RS-485 temperature sensor with a simple text communication protocol. The sensor has minimal power consumption and can be powered from an unregulated power source. The measured temperature is transmitted in °C via the simple text protocol.
Via a 4-wire bus consisting of an RS-485 line and a power supply line, up to 32 sensors can be operated on a single bus – with a total range of up to 1200 m. The Temp-485 Box2 uses an integrated temperature sensor with an accuracy of ±0.5°C and is equipped with an LED that indicates an ongoing measurement. The Temp-485 Box2 is offered as a single version – there are no variants or options.
Precise temperature measurement with an industrial-grade bus
The Temp-485 Box2 is designed for building large, distributed temperature measurement networks.
Measuring range -10°C to +70°C
Integrated temperature sensor with ±0.5°C accuracy and a resolution of 0.1°C.
RS-485 bus for up to 32 sensors
Up to 32 sensors can be operated on a shared 4-wire bus (RS-485 + power supply), with a total cable length of up to 1200 m.
Minimal power consumption
Low power consumption of approx. 10 mA; voltage regulation is not required – the sensor tolerates an unregulated power supply.
LED status indication
LEDs indicate the operating status (green: power supply OK) and ongoing communication via RS-485 (yellow).
Simple wall mounting
Mounting is straightforward with two screws directly on the wall.
Designed for Poseidon SNMP thermometer
The sensors are specifically designed for use with the Poseidon SNMP thermometer device.
How the Temp-485 Box2 is built
The compact plastic housing (approx. 80 x 64 x 67 mm) has protection class IP20 and is designed for operating temperatures of -10°C to 70°C (0–100% RH) and a storage environment of -30°C to 60°C (5–95% RH).
External gold-plated temperature sensor
A gold-plated temperature probe mounted on the outside of the housing measures the ambient temperature with ±0.5°C accuracy.
RJ45 and terminal connection
The RS-485 bus and the power supply can be connected either via an RJ45 connector or via screw terminals.
Address jumpers
Several jumpers on the board allow the RS-485 bus address of the sensor to be set in hardware.
DIP switch for bus termination
A DIP switch (positions 1 and 2) activates the RS-485 bus termination if required; independently of this, 10 kΩ resistors are always installed that define the idle state of the line.
LED indicators
A green LED indicates that the power supply is OK; a yellow LED signals ongoing communication via the RS-485 bus.
Addressing via jumpers or terminal SETUP mode
The bus address of the Temp-485 Box2 can be set in two ways: in hardware via the jumpers on the board, or in software via the integrated SETUP mode, which is accessed through a serial terminal.
- Display of the current temperature in SETUP mode
- Adjustable outgoing delay
- Adjustable bus address (Address)
- Adjustable resolution (Resolution)
- Simple text communication protocol via the RS-485 interface
SETUP mode (example): In the terminal, an overview appears with hardware and firmware version, the currently measured temperature, the set outgoing delay, the bus address and the resolution, from which the desired values can be changed directly.
More functions in combination with a Poseidon device
The Temp-485 Box2 can be read out independently via RS-485 or connected to a Poseidon device to use additional functions.
- Transmission of measured values via the Ethernet network
- Logging of up to 100,000 values in the internal flash memory of the Poseidon device
- Compatible with the Poseidon model 1250
- Compatible with the Poseidon model 2251
Installation in a few steps
The Temp-485 Box2 is integrated directly into the existing RS-485 bus cabling.
- Mount the housing on the desired wall using the two screws supplied
- Connect the sensor to the RS-485 bus (A, B, power supply) via RJ45 or the screw terminals
- Establish the power supply with +8V to +30V DC (polarity is not critical thanks to reverse polarity protection)
- Set the bus address via jumpers or configure it via the terminal SETUP mode
- If required, activate the RS-485 termination via the DIP switch (positions 1 and 2) if the sensor is at the end of the bus
- Connect further Temp-485 Box2 sensors with their own address in series on the same 4-wire bus (up to 32 sensors, max. 1200 m total length)
- Optional: connect the bus to a compatible Poseidon device (model 1250 or 2251) to provide the values via Ethernet and log them
Why the Temp-485 Box2 is the right choice
Large bus range
Up to 1200 m total length for extensive measurement networks.
Many sensors on one bus
Up to 32 Temp-485 Box2 sensors on one RS-485 bus.
Minimal power consumption
No voltage regulation required, approx. 10 mA consumption.
Flexible addressing
Configurable via jumpers or in terminal SETUP mode.
Simple mounting
Wall mounting with just two screws.
24-month warranty
According to the manufacturer with 24 months warranty from the date of purchase.
Practical application examples
- Large-scale temperature measurement systems
- Industrial measurement and control
- Temperature measurement in food and pharmaceutical warehouses
- Temperature measurement in industrial or residential rooms
Practical example: In a pharmaceutical warehouse with several rooms, a Temp-485 Box2 is mounted on the wall at various points and connected via a shared 4-wire RS-485 bus to a central Poseidon device. Since the total cable length may be up to 1200 m, even widely separated storage rooms can be integrated without difficulty. The Poseidon device provides the measured values of all connected sensors via Ethernet and logs them permanently in the internal flash memory.
Frequently asked questions
What is the HW group Temp-485 Box2 and what is it used for?
The Temp-485 Box2 is an indoor RS-485 temperature sensor with a simple text communication protocol. It is suitable for large-scale temperature measurement systems, industrial measurement and control, and temperature monitoring of food, pharmaceutical and other storage rooms.
Are there different variants or options?
No. The Temp-485 Box2 is offered as a single version. There are no variants or options for this sensor.
How many sensors can be operated on one bus?
Via a shared 4-wire bus (RS-485 line plus power supply), up to 32 Temp-485 Box2 sensors can be operated, with a total cable length of up to 1200 m.
How is the bus address of the sensor set?
The address can be set either in hardware via jumpers on the board or in software via the integrated terminal SETUP mode. In SETUP mode, the current temperature can also be displayed and the outgoing delay and resolution can be configured.
Can the sensor be operated independently, or is a Poseidon device required?
The Temp-485 Box2 can be read out independently via the simple text communication protocol over RS-485. In combination with a compatible Poseidon device (model 1250 or 2251), additional functions are available: transmission of the values via Ethernet and logging of up to 100,000 values in the internal flash memory.
Does the sensor require a regulated power supply?
No. The Temp-485 Box2 has minimal power consumption (approx. 10 mA) and does not require voltage regulation; it can be powered with +8V to +30V DC from an unregulated source and has reverse polarity protection.
What do the yellow and green LEDs on the device indicate?
The green LED indicates that the sensor’s power supply is OK. The yellow LED lights up when communication is taking place via the RS-485 bus; in addition, an LED indicates an ongoing temperature measurement.
Is the RS-485 termination already activated?
The actual bus termination is optionally switchable via a DIP switch (positions 1 and 2) and should only be activated at the physical end of the bus. Independently of this, the sensor is always equipped with 10 kΩ resistors that define the idle state of the line.
Questions about the Temp-485 Box2?
Our support team in Germany will advise you free of charge on selection, sensors and configuration.
Technical Parameters:
- Temperature measurement range: -10°C to +70°C
- Measurement accuracy: ± 0.5°C
- Supply voltage: +8V to +30V DC with reverse polarity protection
- Protection class: IP 20
- External dimensions: 80 x 64 x 67 mm
- Wall mounting: Attachment with two screws
Interfaces:
- RS-485 communication
- RJ45 connector for RS-485 bus and power supply
- Terminal block for RS-485 bus and power supply
- External gold-plated temperature sensor
- 4-wire bus system
Configuration:
- Addressing via jumper or terminal SETUP mode
- Up to 32 sensors on one bus (up to 1200m distance)
- DIP switch for RS-485 termination
- 10 kΩ resistors for line idle state
- Simple text communication protocol
Functions:
- Minimal power consumption
- No voltage regulation required
- Temperature values in °C via simple text protocol
- Compatible with Poseidon Model 1250
- Compatible with Poseidon Model 2251
- Ability to store up to 100,000 values in internal flash memory (when connected to Poseidon)
LED Indicators:
- Green: Power supply OK
- Yellow: Communication via RS-485
- LED indicator during measurement
Monitoring devices
Other available sensors
Extension units
Accessories
DB9 LapLink Cable 2m A LapLink cable (also known as Lablink or null-printer cable) is a cable used to connect two computers directly via a cable connection. Housing: Plastic Type: Cable
Mounting Plate D Bracket for Ares and Poseidon2 Operating environment: -3°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 74 x 6 x 120 (W x H x D) / 58g Warranty: 24 months Wall mounting plate for Ares, Poseidon2 3266/68 and other products.
DIN-Rail Box Set A mounting kit for installing HW-group devices on a DIN rail. Applications and Use: Mounting kit for installing HW-group devices with metal housing on a DIN rail. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 45 x 11 x 105 (W x H x D) / 22g
Mounting Kit Screw set for mechanical mounting Applications and Use: Screw set for mechanical fastening
Mounting Plate E- 1U Rack (cabinet) mounting plate, 1U mounting for HW-group Ares and Poseidon2 devices Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 127 x 45 x 94 (W x H x D) / 137g Warranty: 24 months Rack (cabinet) mounting plate, 1U mounting for HW-group Ares, Poseidon2 3266/3268 and other products.
Mounting Plate L DIN Rail DIN rail mounting plate for Ares, Poseidon2 3268, and other products. Features: Metal housing Wall mounting Applications and Use: Profiles for metal-encapsulated HWg devices for wall mounting. Dimensions: 150 x 120 x 45 (W x H x D) / 65g Warranty: 24 months
Mounting Kit for Poseidon2 4002 and HWg-SMS-GW3 Applications and Use: Mounting kit for Poseidon2 4002 and HWg-SMS-GW3 Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 136 x 45 x 16 (W x H x D) / 165g Warranty: 24 months
Rack Shelf 1U A versatile solution for easy mounting of HW-group devices in 1U racks. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 485 x 44 x 104 (W x H x D) / 597g Warranty: 24 months Housing: Metal Type: Wall mounting This shelf makes it easy to use devices in racks. You can even combine different 1U products and sensors.
Software
Manufacturer information:
HW group s. r. o.
Rumunská 26
Prague, 120 00
Czech Republic
Phone: +420 222 511 918
Email: sales@hwg.cz
Responsible person:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
