User's Manual

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T90-DTU_User Manual

1. Introduction

1.1. Brief introduction

T90-DTU (900SL22) is a data transceiver with military-grade LoRa modulation technology. With multiple transmission modes, it

works in the (920-925MHz) frequency band. The transceiver provides transparent RS232/RS485 interface and supports 8~. 28V

voltage input. LoRa direct-sequence spread spectrum technology will bring longer communication distances, and has the advantages of

concentrated power density and strong anti-interference ability. It features a software FEC forward error correction algorithm, which

has high coding efficiency and strong error correction capability. In the case of sudden interference, it can proactively correct the

interfered data packets, greatly improving reliability and transmission distance. In the absence of FEC, such packets can only be

discarded. It has data encryption. The data transmitted by the transceiver over the air is random, and the data interception is

meaningless through strict encryption and decryption algorithms. Packet length setting is available to support different real-time and

data packets.

As a communication medium, wireless data transceiver has the same scope as optical fiber, microwave and bright line: it

provides real-time and reliable data transmission of monitoring signals in private networks under certain special conditions, with low

cost, installation and maintenance. It is convenient, has strong diffraction ability, flexible networking structure and long coverage. It is

suitable for occasions with many points and scattered, complex geographical environment, etc. It can be connected with PLC, RTU,

rain gauge, liquid level meter and other data terminals.

1.2. Features

★ All core components are imported, featuring the most advanced functions, the smallest volume and the best price.

★ Using military-grade LoRa modulation technology, with data encryption, the packet length is available for configuration.

★ Large single package, single package is up to 240 bytes, adapt to Modbus.

★ Simple and efficient power supply design, support power adapter or crimping mode, support 8~28V power supply.

★ Transmit power is up to 1W, multi-level adjustable, with all technical indicators meeting European industrial standards.

★ Support LBT function, the transceiver automatically waits to send data according to the current ambient noise intensity. The

communication success rate of the module in harsh environments is greatly improved.

★ Remotely configure or read wireless module parameters by sending command packets wirelessly.

★ Multi-level relay networking can be realized， which effectively extends communication distance for ultra-long-distance

communication.

★ With temperature compensation circuit, the frequency stability is better than ±1.5PPM.

★ Operating temperature range: -40 ° C ~ +85 ° C, to adapt to a variety of harsh working environment.

★ All-aluminum alloy casing, compact size, easy installation and good heat dissipation; perfect shielding design, with good

electromagnetic compatibility and strong anti-interference ability.

★Multiple protection functions such as power reverse connection protection, over-current protection, and antenna surge protection

greatly increase the reliability of the device.

★ Powerful software functions, all parameters can be programmed: such as power, frequency, air data rate, address ID, etc.

Summary of content (16 pages)

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T90-DTU_User Manual 1. Introduction 1.1. Brief introduction T90-DTU (900SL22) is a data transceiver with military-grade LoRa modulation technology. With multiple transmission modes, it works in the (920-925MHz) frequency band. The transceiver provides transparent RS232/RS485 interface and supports 8~. 28V voltage input. LoRa direct-sequence spread spectrum technology will bring longer communication distances, and has the advantages of concentrated power density and strong anti-interference ability.
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T90-DTU User Manual ★ Ultra-low power consumption, the standby current is only 10mA (lower than power consumption in power-saving mode and sleep mode), and the transmitting current is ≤0.1A. ★ with built-in watchdog and precise time layout, once an exception occurs, the transceiver will automatically restart, and continue to work according to the previous parameters. 2. Dimensions 2.1. Parts description 2 No.
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T90-DTU User Manual 2.2.
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T90-DTU User Manual 3. Interface definition 3.1. Power interface Users can choose ⑥ DC power interface,using the power adapter supply with the interface of the 5.5mm outer diameter , 2.5mm diameter ; Also users can choose the VCC and GND terminal power supply from ② , both are optional； 8 ~ 28V DC power supply, it is recommended to use 12V or 24V DC power supply for T90-DTU. 3.2. RS232 The T90-DTU can be connected to the device via RS-232 using the standard DB-9 interface. 3.3.
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T90-DTU User Manual ★ Note: The transceiver will be in poor communication when connected to multiple devices , it is recommended to be connected to a single device, please try to use parallel 120Ω resistor between 485_A terminal and 485_B. 4. Technical specification 4.1. Model specification Model No. Frequency TX power Distance Hz mW km 920M 7.
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T90-DTU User Manual 4.3. Frequency and channel numbers Model No. T90-DTU Default Frequency Frequency Range Channel Interval Hz Hz Hz 920M 920~925MHz 1M Channel numbers 81，half duplex ★ Note: In the same area when multiple data transceivers are communicating one to one at the same time , it is recommended to set the channel spacing between each group of data transceivers at 2MHz or more. 4.4. Transmitting power Model No.
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T90-DTU User Manual 4.7. TX and RX FIFO and sub-packing method Model No. Buffer T90-DTU 1000 bytes Sub-packing method Can be sub-packed to 32/64/128/240 byte each time via command ★ Note:1. When the receiving data is more than a single packet capacity, the beyond part will be automatically assigned to the second transmission until it is completed; 2. The data transceiver can not receive data which is more than the buffer capacity; 5. Function Description 5.1.
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T90-DTU User Manual 5.2. Broadcast Transmission 5.3. Broadcast Address  For example: Set the address of module A as 0xFFFF and channel as 0x04;  When module A is the transmitter (same mode, transparent transmission), all modules under channel 0x04 will receive the data, the purpose of broadcast is realized. 5.4.
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T90-DTU User Manual the configuration software on computer. Mode 3 Sleep Mode OFF OFF DTU is in sleep mode. Note: WOR(mode 1) and sleep mode(mode 3) are for low power consumption. If users do not require low power, then it is OK to use mode 0 and mode2 only. 6.1. Normal mode（ mode 0） M0 = ON，M1 = ON，device works in Mode 0 Transmitting Users send data via UART. The device will start wireless transmission. Receiving Wireless receiving is enabled, data received will be output via pin TXD. 6.2.
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T90-DTU User Manual Receiving Wireless receiving is off. Configuration Users can visit register to configure the working status. 6.4. Sleep mode（mode 3） M0 = OFF，M1 = OFF，device works in Mode 3 Transmitting Receiving Note Wireless transmission is unavailable. Wireless receiving is unavailable. When entering other modes from the sleep mode, the parameters will be reconfigured.
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T90-DTU User Manual Example 1：Set channel as 0x09 command start address length Transmit：C2 05 01 09 Return：C1 05 01 09 parameter Example 2：set module address（0x1234）, network address (0x00), UART (9600 8N1), air data rate (1.
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T90-DTU User Manual 7，6： sub-packing setting 00：240byte （Default） 01：128byte 10：64byte 11：32byte ----------------------------------------------5 ：enable RSSI environmental noise 1：on 0：off（Default） Read/W rite 04H REG1 ----------------------------------------------4，3，2 remain ----------------------------------------------1，0： TX power 00：22dbm（Default） 01：17dbm 10：13dbm 11：10dbm Read/W rite 05H REG2 Channel （CH） 0-80 stands for 81 channel respectively 7 enable RSSI byte 1：on 0：off（Default） ------
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T90-DTU User Manual Users must transmit the first byte within ----------------------------------------------2，1，0，WOR time 000：500ms 001：1000ms 010：1500ms 011：2000ms（Default） 100：2500ms 101：3000ms 110：3500ms 111：9000ms 07H Write CRYPT_H key high byte（Default 0） 08H Write CRYPT_L key low byte（Default 0） 80H~ 86H Read only PID 1000ms. ------------------------------------- Only valid in Mode 1.
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T90-DTU User Manual “Node 1” NETID is 08. “Node 2” NETID is 33. Primary repeater 1‘s ’ADDH\ADDL are 08，33. So the signal sent by node 1 (08) can be forwarded to node 2 (33) At the same time, node 1 and node 2 have the same address, so the data transmitted by node 1 can be received by node 2. ② Secondary repeater Secondary repeater’s ADDH\ADDL are 33，05. Therefore, Repeater 2 can forward the data of Repeater 1 to the network NETID: 05. Thus node 3 and node 4 can receive node 1 data.
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T90-DTU User Manual 10. Operation notes 1. The device may not be operated in the vicinity of some flammable places (such as coal mines) or explosive dangerous objects (such as detonators for detonators). 2. Appropriate DC stabilized power supply should be selected, which requires strong anti-high frequency interference, small ripple, and sufficient load capacity; it also has functions such as overcurrent, overvoltage protection and lightning protection to ensure data transmission. 3.
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T90-DTU User Manual FCC Caution: Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. 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, and (2) this device must accept any interference received, including interference that may cause undesired operation. FCC RF Radiation Exposure Statement: 1.