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EnOcean device testing | Transmitter receiver measurements

This page covers EnOcean device testing as defined in EnOcean radio protocol certification specifications. It covers various EnOcean transmitter and receiver measurements required during EnOcean conformance tests.

What is EnOcean technology ?

The EnOcean is energy harvesting wireless technology designed mainly for building automation. EnOcean can also be used across industries for M2M (Machine to Machine) communication, IoT (Internet of Things), smart homes etc. EnOcean devices such as switches and sensors derive energy from its natural surroundings. The three major sources used by EnOcean devices include changes in temperature, variance in luminance level and motor vibration. Hence EnOcean does not require battery for its operation. Moreover it does not require wires as it is wireless in nature. EnOcean technology uses sub 1 GHz frequency bands across the world which include 868 MHz, 315 MHz, 902 MHz and 928 MHz. It also used 2.4 GHz frequency band across the world for IoT applications.

EnOcean technology uses ASK and FSK modulation schemes in different frequency bands as defined by the standard. ASK (Amplitude Shift Keying) modulation is used by 315 MHz and 868 MHz bands as defined in ISO/IEC 14543-3-10 standard physical layer section. FSK (Frequency Shift Keying) modulation is used by 902 MHz and 928 MHz frequencies.

EnOcean Certification tests

Following tests are defined in EnOcean certification specification as per ASK modulation air interface. The EnOcean certification tests require following EnOcean test equipments. The conformance or certification tests help in assuring whether EnOcean devices operate as desired or not as per EnOcean protocol specifications.
Signal generator : It is used to test receiver part of EnOcean DUT (Device Under Test).
Signal analyzer : It is used to test transmitter part of EnOcean DUT (Device Under Test).
Climate chamber : To maintain required environmental conditions as per test requirements.
Automated test system (ATS) : This system helps in certain tests where automatic trigger transmission and reception at certain time instants are needed. It is used to acquire logs during long duration tests.

EnOcean transmitter tests

In this test, DUT (Device Under Test) is connected with signal analyzer having specific measurement accuracy. Signal analyzer validates DUT transmitter part by measuring, decoding and analyzing physical layer, data link layer and network layer. Following table mentions EnOcean tests for transmitter part.

Transmitter tests Description with Pass criteria
Frequency Error It should not exceed +/- 82.634 KHz (maximum).
Output power It should not exceed +13 dBm (Under all test conditions). Deviation of +/- 3 dB relative to output power of DUT as mentioned by manufacturer in the datasheet.
Output power stability It should not exceed +2 dB (positive maximum) and -1 dB (negative maximum).
Modulation It should test both ASK and FSK modulated frames. The signal analyzer demodulates and decodes the frames with different modulation parameters set in the DUT.
Duty Cycle This tests is carried out as per national regulations to check how much time DUT is transmitting the frame.
Encoding of frame This tests ensures whether encoding of subtelegram to frame is as per defined format or not.

EnOcean receiver tests

In this test, DUT (Device Under Test) is connected with signal generator capable of generating EnOcean stanadrd compliant signals. Signal generator transmits signal using different RF parameters such as frequency, power and modulation as per test case requirement. The signal generator uses telegram and subtelegram with data and timing as specified in the ISO document to validate data link layer and network layer respectively. Following table mentions EnOcean tests for receiver part.

Receiver tests Description with Pass criteria
Modulation test Different modulation test scenarios are mentioned in the certification document.
Center frequency test It is done to test whether receiver performs demodulation as desired at center frequency.
Sensitivity -95 dBm or less with conditions as defined in the standard
Maximum Power level -23 dBm or more
Blocking The test checks whether receiver rejects all the undesired frequencies adjacent to operating frequency.
Demodulation robustness Subtelegram error rate should not exceed 12.9% under test conditions defined.
Decoding of frame This tests ensures whether DUT decodes all the frames without error or not. It also checks whether DUT discards all incorrect frames or not.

The common EnOcean tests include following.
• Tx-Rx Switch Over Time : It checks time required for the EnOcean transceiver to switch from transmitting state to the receiving state. This is defined in manufacturer datasheet.

Refer EnOcean Certification Specification for test setup and measurement procedure. Frame patterns for different test cases with subtelegram and telegram details are defined in the certification document.

EnOcean wireless technology Related Links

➨Refer advantages and disadvantages of EnOcean Wireless technology >>
EnOcean technology basics >>

References :-

• EnOcean Certification Specification (part 1a), Air Interface (ASK) V1.4, Released on Feb.10, 2019
• Visit www.enocean.com for everything you would like to know about EnOcean technology from inventor and pioneer of this energy harvesting wireless technology.
• EnOcean Alliance

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