Device Description

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Device Description



Temperature Measurement

oThe measurement data are sent to the RMS WEB software at the fixed interval.

oThe device sends to the measured data via Modbus TCP to the RMS WEB Service every fixed interval.

Logging function

oEvery measurement value and the time stamp is stored in the device memory.

oIn case of data interruption, the data can be read out via the RMS WEB software automatically afterwards.

Audit Trail

oThe device stores changes of the device settings.

oThese information are supplied to the RMS WEB Service.

Battery powered operation

If the external power supply fails, the device runs in battery mode. Measurements are still carried out in the specified interval and the data is stored in the memory.

Firmware Update

The firmware update can be done by the RMS WEB Service.


The Discovery function can be used to find and configure devices within the subnet regardless of their IP configuration.

Use of a static IP Configuration

oIP Address

oSubnet Address

oGateway Server

Use of dynamic IP Address (DHCP)

DHCP Client can be turned on / off.

URL of the RMS WEB Service

Configuration of the URL for using the RMS WEB Service.

DNS Server

For the DNS, a primary and secondary DNS address can be set.



Power Variants

Option 1: 24 V, via terminal, see "Accessories"

Option 2: Power over Ethernet (IEE 802.3af, Class 1)

Option 3: Battery, see RMS-BAT RMS-BAT Rotronic Website


Power supply to be used: 24 VDC ±10 %, 4 W nominal, > 15 W Limited Power Source



Logging function

For each temperature measurement, the measured values are stored in the memory with the associated time stamp. At a measuring interval of one minute, data can be stored for one month, which corresponds to approx. 44,000 measurements. If the memory is full, the oldest values are overwritten.



Indicator and Push-button

The device has a button and a multicolored LED for operation and display of the operating status. The button is used when the device is put into operation or to switch off the logging process in battery mode. The LED indicates the device status and whether a valid measurement was performed in the current measurement interval and the data could be sent to the monitoring system.



Indicator LED

When powered externally, the LED flashes every five seconds to indicate the status of the unit. The displayed device status is updated with each measurement and therefore always refers to the last measurement.


In battery mode, the status can be set to be displayed less frequently or only at the touch of a button to extend the running time.





1x Green

External supply or battery

Measurement successful, data transmission successful

1x Orange

External supply or battery

Measurement successful, data transmission failed

1x Red

Battery only

Low battery





If the RMS wireless device is offline for a longer period of time, then this may cause for the wireless module to be sent into failure mode. This happens when a very low power supply is supplied to the device. Once the wireless module is in failure mode, it cannot be resuscitated. Once the wireless module has failed, the device's LED will blink differently to any way that is described in the manual.


Recommendation: Please remove the batteries if the user anticipates keeping a wireless device disconnected for a longer period of time.



The device is controlled and configured via a server application. When a device is integrated into a system, the user must confirm he is the owner of the respective device by pressing on a key.


Whether a device is integrated in the system or is primarily stored on the server. However, the device retains this information each time it communicates with the server and maintains the state in the event of a reboot or loss of connection. To remove the device from the system, it must be deleted from the server.


With a long keystroke, the local copy of the state can be discarded. Please note that the next time you communicate with the server, the state stored on the server will be adopted (if the device is integrated into the system). The function can be used as follows:


a) The device is in battery mode (no server communication) and should be temporarily deactivated (no measurement, recording).

b) The device is connected to a system which is not accessible and should now contact another server. In the integrated state, write-protection via Modbus TCP is active, which prevents settings from being overwritten. By a long keystroke this is deactivated and the new configuration can be written.


Operation external powered

Operation status

Push-button pressed


Short time

Confirm pairing when connecting the device to the Rotronic Monitoring System. The LED flashes orange before the pairing can be confirmed. If the pairing is not confirmed, the device returns to offline mode after a certain time (determined by the RMS-WEB software).


Long time (app. 4 to 5 sec.)

Discard the local pairing information. Note that pairing is always set by the server. If there is a connection to the server, the pairing is immediately taken over again.

In all operation status not listed (in the table above), the push-button has no function.


Operation battery powered

Operation status

Push-button pressed


Short time

Display of the operation status by the LED indicator


Long time (app. 4 to 5 sec.)

Stop of the logging function, turn-off the device.

In all operation status not listed (in the table above), the push-button has no function.



RTCC (Real Time Clock Calendar)

The device is equipped with a real time clock. The time is continuously synchronized if there is a connection to the server.






RMS-BAT (ER14505M, various manufacturers - see website: accessories)




~2000 mAh


3.6 V


AA (H: 50.3 mm, D: 14.55 mm)




After removing the wall bracket, insert the batteries according to the label in the battery compartment.

oThe batteries are used to power the unit in the event of a failure of the external power supply. In battery operation, the functionality is limited and the device cannot be addressed via Ethernet.

oLithium AA batteries with 3.6 V are used.

oThe mounting position must be observed. The polarity is indicated on the battery and in the battery compartment.


Rotronic recommends the following battery: