User manual

FCC ID: 2ALPH-E90-DTU

Users Manual

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FCCID_3918806

$Ebyte wireless data transceiver E90-DTU series user manual 1.Introduction 1.1. Brief introduction E90-DTU series are wireless data transceivers of 868M/915MHz with standard RS232/RS485 connectors. They are half-duplex TX & RX modems with GFSK modulation, which largely lower frequency bandwidth thus enable its strong anti-interference ability. Transparent transmission mode is available. Voltage supply ranges from 10V to 28V, convenient for users to install and debug. E90-DTU features FEC algorism, which enables higher coding efficiency and correction ability. The interfered data packets will be corrected proactively upon sudden interference, which significantly improves reliability and communication distance. Without FEC, the interfered data packet will be dropped. The transceivers feature data encryption and compression. The data transmitted in air features randomness, the rigorous algorism makes data interception meaningless. The data compression function has possibility to reduce the data transmission time, which in turn reduces the possibility of being interfered, thus improves the reliability and communication efficiency. As a communication media, similar as optical fiber, microwave and cable, the wireless data transceiver can be applied in specific scope: it provides real-time and reliable data transmission of specific network monitor signal under some special conditions, it features cost-efficiency, easy installation, simple maintenance, super diffraction ability, flexible networking structure, large area covering and so on. It is suitable for multiple points under complex environment, and it is applicable for connecting with PLC, RTU, hyetometer, level gauge and so on. E90-DTU series strictly follow FCC, CE, CCC standards, and meet various certification requirements and can be applied all over the world. 1.2. Features ★ All core components are originally imported, our transceiver modems have much advanced functions with smaller size and lower cost. ★ TX power100mW, all technical parameters meet European industrial standards. ★ Temperature compensators are adopted to make the frequency stability better than ±1.5PPM. ★ Operation temperature range: -40℃～+85℃, applicable for various harsh environment, it is real industrial grade products. ★ Aluminum alloy case, compact size, great heat dispersion; good shielding, prime electromagnetic compatibility and strong anti-interference. ★ Power reverse & overload protection and antenna surge protection functions significantly improve the reliability. ★ Parameters can be configured by programming, such as TX power, frequency point, air data rate, address and so on. ★ Ultra-low power consumption, standby current is only 50mA (even lower under power-saving and sleep modes). ★ Embedded watch-dog and precise time layout, modem will restart automatically upon abnormal situation and work with previous parameters. ★ The transceivers adopt original Silicon Labs SI4463/SI4438/SI4464 chips, customers highly comment the products because of the super reliability. . 2$

907 MHzÿ922.5 MHz

Ebyte wireless data transceiver E90-DTU series user manual
★ Note: The transceiver will be poor communication when connecting multiple devices , while connecting a single device is not, please
try to parallel connect 120Ω resistor between 485_A terminal and 485_B.

4. Technical specification

4.1. Model specification

Frequency TX power Distance
Model Features Recommended applications
MHz W km

North America band, FEC, Stable Applicable for living, industrial areas and open mountain
E90-DTU（868M20） 868 0.1 2
performance area with a few obstacles

European band，FEC, Stable Applicable for living, industrial areas and open mountain
E90-DTU（915M20） 907-922.5 0.1 2
performance area with a few obstacles

★ Note: Test conditions: clear weather, open area, no blockage, 12V1A power, 5dBi gain sucker antenna, 2 meters above ground, default parameters

4.2. General parameters

Model Size Weight Temperature Impedance Voltage Interface Baud rate Address code
E90-DTU（868M20） 82 * 62 * 25mm 131g±3g -40 ~ 85℃ 50 Ω 8 ~ 28V DC RS232/RS485 Default 9600 Default 0

E90-DTU（915M20） 82 * 62 * 25mm 131g±3g -40 ~ 85℃ 50 Ω 8 ~ 28V DC RS232/RS485 Default 9600 Default 0

★ Notes: Operating temperature: it is recommended to be lower than 70℃. Antenna impedance: standard 50Ω characteristic impedance. Voltage:
higher than max value will damage the transceiver. Communication interface: standard DB9 hole/3.81 terminal. Baud rate: 1200~115200. Address:
65536 addresses.

4.3. Frequency and Channel

Default Frequency Frequency Band Channel Interval
Model Channel
MHz MHz MHz

E90-DTU（868M20） 868 855~880.5 0.1 256，half duplex

E90-DTU（915M20） 907-922.5 900~925.5 0.1 31 ，half duplex

★ Notes: When multiple pairs work in same area, please set at least 2MHz channel interval between each pair to avoid interference.

4.4. Transmitting power

Model 10mw 25mW 50mW 64mW 100mW 125mW 250mW 500mW 5W

E90-DTU（868M20） √ √ √ √

E90-DTU（915M20） √ √ √ √

★ Notes: The lower the TX power, the shorter the communication distance. The current will not decrease at equal scale. Max power is recommended.

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Ebyte wireless data transceiver E90-DTU series user manual

4.5. Air data rate

Default air data rate AIr data rate
Model Level
Kbps kbps

E90-DTU（868M20） 1 8 1、2、5、8、10、15、20、25

E90-DTU（915M20） 1 8 1、2、5、8、10、15、20、25

★ Notes: The higher the air rate, the quicker the transmission and the shorter the distance. So lower air rate is recommended.

4.6. Current value

Transmitting current mA Stand-by current mA
Model
12V DC 24V DC 12V DC 24V DC

E90-DTU（868M20） 93 62 18 25

E90-DTU（915M20） 89 60 16 22

★ Notes: At least 50% current allowance is recommended when selecting power source in order to ensure long-term stable operation.

4.7. TX/RX length and sub-packing

Model Buffer Sub-packing
E90-DTU（868M20） 512 bytes Auto sub-packing 58 bytes
E90-DTU（915M20） 512 bytes Auto sub-packing 58 bytes

★ Notes
1. If single data packet is beyond allowed volume (100 bytes), the exceeded data will be left to the second transmission until it is sent completely.
2. The single RX data packet should not exceed the flash volume.

5. Operation Modes

E90-DTU transceivers have four operation modes. Please configure to general mode (M0) if no harsh low consumption required.
The transceivers are set to general mode (M0) by default.

Mode M1 M0 Notes
Mode 0 Common mode On On Serial port open, RF on, transparent transmission

Mode 1 Wake-up mode On Off Wake-on-air TX mode, data packet includes wake-up codes

Mode 2 Power-saving mode Off On Wake-up RX mode, saving RX power, TX not allowed
Mode 3 Sleep mode Off Off In sleep mode, configuration commands allowed

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FCC Statement
1. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
(1) This device may not cause harmful interference.
(2) This device must accept any interference received, including interference that may cause
undesired operation.
2. Changes or modifications not expressly approved by the party responsible for compliance could
void the user's authority to operate the equipment.
NOTE:
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation.
This equipment generates uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
Consult the dealer or an experienced radio/TV technician for help.

RF Exposure warning:
The distance between device include antenna and user should be no less than 20 cm.

Document Created: 2018-07-10 08:21:49
Document Modified: 2018-07-10 08:21:49