Wireless Data Transceiver E90-DTU User Manual This manual may be modified based on product upgrade, please refer to the latest version. All rights to interpret and modify this manual belong to Chengdu Ebyte Electronic Technology Co., Ltd. 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 Ebyte wireless data transceiver E90-DTU series user manual 2. Dimension 2.1 Description Pin NO. Name Function Description 1 2 3 4 5 6 7 8 DB-9 female socket RS-232 Standard RS-232 interface 3.81 terminal RS-485power interface Standard RS-485 interface and pressure line power interface PWR-LED Power LED Red, lit when the power is on TXD-LED Transmit LED Yellow, blinks when sending data RXD-LED Receive LED Yellow, blinks when sending data DC power interface Power interface In-line round hole, outer diameter 5.5mm, diameter 2.5mm DIP switch Dip switch Controlled by working mode Antenna interface SMA-K interface external thread, 10mm, 50characteristic impedance
. 3 Ebyte wireless data transceiver E90-DTU series user manual 2.2. Dimension of type A NoteType A is for 2W specificationincluding E90-DTU868M20 E90-DTU915M20
. 4 Ebyte wireless data transceiver E90-DTU series user manual 3. Interface definition 3.1. Power interface Users can choose DC power interface,using the power adapter supply with the interface of the 5.5mm outer diameter , 2.5mm diameter ;
Also choose the VCC and GND terminal power supply, only choose any one of the power supply is OK;
E90-DTU can use 10 ~ 28V DC power supply, but it is recommended to use 12V or 24V DC power supply. 3.2. RS232 interface The E90-DTU can be connected to the device via RS-232 using the standard DB-9 interface. 3.3. RS485 interface E90-DTU can connect the 485_A terminal and 485_B terminal with the device RS-485 A terminal and B terminal. Pin NO. Definition Function Description 1 2 3 4 VCC GND 485_B 485_A Pressure line power interface, positive 10 ~ 28V DC, recommended 12V or 24V Pressure line power interface, negative The power supply negative pole is connected to the system ground and the housing RS-485 interface, interface B The RS-485 interface B is connected to the device interface B RS-485 interface, interface A The RS-485 interface A is connected to the device interface A
. 5 907 MHz922.5 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 120 resistor between 485_A terminal and 485_B. 4. Technical specification 4.1. Model specification Frequency TX power Distance Model MHz E90-DTU868M20 868 W 0.1 E90-DTU915M20 907-922.5 0.1 km 2 2 Features Recommended applications North America band, FEC, Stable Applicable for living, industrial areas and open mountain performance area with a few obstacles European bandFEC, Stable Applicable for living, industrial areas and open mountain 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-DTU868M20 82 * 62 * 25mm 131g3g
-40 ~ 85 E90-DTU915M20 82 * 62 * 25mm 131g3g
-40 ~ 85 50 50 8 ~ 28V DC RS232/RS485 Default 9600 Default 0 8 ~ 28V DC RS232/RS485 Default 9600 Default 0 Notes: Operating temperature: it is recommended to be lower than 70. Antenna impedance: standard 50 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 E90-DTU868M20 MHz 868 E90-DTU915M20 907-922.5 MHz 855~880.5 900~925.5 MHz 0.1 0.1 Channel 256half duplex 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-DTU868M20 E90-DTU915M20 Notes: The lower the TX power, the shorter the communication distance. The current will not decrease at equal scale. Max power is recommended. 6 Ebyte wireless data transceiver E90-DTU series user manual 4.5. Air data rate Model Level Default air data rate E90-DTU868M20 E90-DTU915M20 Kbps 1 1 8 8 AIr data rate kbps 125810152025 125810152025 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 Model E90-DTU868M20 E90-DTU915M20 Transmitting current mA Stand-by current mA 12V DC 93 89 24V DC 62 60 12V DC 18 16 24V DC 25 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 E90-DTU868M20 E90-DTU915M20 Notes Buffer 512 bytes 512 bytes Sub-packing Auto sub-packing 58 bytes Auto sub-packing 58 bytes 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 0 Mode 1 Mode 2 Mode 3 Mode Common mode Wake-up mode Power-saving mode Sleep mode M1 On On Off Off M0 On Off On Off Notes Serial port open, RF on, transparent transmission Wake-on-air TX mode, data packet includes wake-up codes Wake-up RX mode, saving RX power, TX not allowed In sleep mode, configuration commands allowed
. 7 Ebyte wireless data transceiver E90-DTU series user manual 6. Connection Diagram for Configuration Mode General mode Wake-up mode Power-saving mode Sleep mode M1 On On Off Off M0 On Off On Off Notes Serial port open, RF on, transparent transmission Wake-on-air TX mode, data packet includes wake-up codes Wake-up RX mode, saving RX power, TX not allowed In sleep mode, configuration commands allowed Mode 0 Mode 1 Mode 2 Mode 3 Notes: Configuration is allowed only under specific mode (refer to above table), please make sure the transceiver is under correct mode. 7. Connection Diagram for Testing & Operation
. 8 Ebyte wireless data transceiver E90-DTU series user manual 8. Applicable Industries Ebyte wireless data transceiver is applicable for kinds of point-to-point, point-to-multipoint transmission systems, such as smart home, IoT upgrade, power grid load monitor, networking automation, utility water pipeline monitor, hydrology measuring, city lights monitor, air warning control, railway signal monitor, railway water supply control, oil & gas pipeline monitor, GPS positioning system, remote meter reading, electronic crane scale, automatic scoring system, earthquake reporting and so on. Please refer to below figure:
9. Important Notes 1. 2. Please do not operate the devices at or near inflammable or explosive areas. Please select stable DC power supply sources, which should have strong anti-interference ability and low ripple as well as load capacity; it is better to have overcurrent or overvoltage and lightning protection in order to ensure normal operation. 3. Please do not use the devices at environment that exceeds the limitation such as high temperature, high humidity, low temperature, strong 4. 5. electromagnetic or dusty environment. Please do not make the devices work continuously at overload status, or it will damage the devices. The ground electrode of the transceiver should be connected firmly to the external devices (PC, PLC, ETC.) and power source ground electrode, or it is easy to damage the communication interfaces; please do not plug on or off the serial port with power on. 6. When testing the transceivers, matched antennas or 50 dummy load must be connected, or it is easy to damage the devices; if antenna connected, human body should be at least 2 meters from the antenna to avoid injury, and do not touch the antenna when it is transmitting. 7. Under different environment, the communication distance will be different. Communication distance will be affected by temperature, humidity, blockage density, blockage size and electromagnetic environment; in order to have stable communication, at least 50% communication allowance is recommended to be kept. 8. If the tested communication distance is not ideal, please also consider about improving the antenna quality and antenna installation. Or please
. 9 Ebyte wireless data transceiver E90-DTU series user manual contact support@cdebyte.com for help. 9. When selecting power source, besides keeping at least 50% current allowance, please also keep the power ripple below 100mV. 10. Important Declarations All rights to interpret and modify this manual belong to Ebyte. This manual will be updated based on the upgrade of firmware and hardware, please refer to the latest version. Please refer to our website for new product information. Technical support: support@cdebyte.com Documents and RF Setting Software downloading: www.cdebyte.com Tel: +86-28-61399028 (ext. 812) Fax: +86-28-64146160 Web: www.cdebyte.com AddressInnovation Center D347, 4# XI-XIN Road,Chengdu, Sichuan, China
. 10 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.