HY915T20S User Manual 915MHz MHz TTL LoRa
DISCLAIMER......................................................................................................................................3 FEATURES............................................................................................................................................................................4 1. OVERVIEW.............................................................................................................................. 5 1.1 INTRODUCTION..........................
7.3 READING VERSION NUMBER........................................................................................................................................15 7.4 RESET COMMAND........................................................................................................................................................15 7.5 PARAMETER SETTING COMMAND................................................................................................................................
Disclaimer Reserves all rights to this document and the information contained herein. Products, names, logos and designs described herein may in whole or in part be subject to intellectual property rights. Reproduction, use, modification or disclosure to third parties of this document or any part thereof without the express permission of HY is strictly prohibited. The information contained herein is provided “as is” and HY assumes no liability for the use of the information.
Features Advanced LoRa modulation, with the advantage of long-distance anti-interference; Fixed-point transmission, broadcast transmission, channel monitoring; FEC forward error correction to improve communication stability; Air wake-up (ultra-low power consumption), suitable for battery applications; Adopt industrial-grade active temperature-compensated crystal oscillator to ensure its stability and consistency; The maximum transmit power is 20dBm, and the software is multi-level adjus
1. Overview 1.1 Introduction HY915T20S is a wireless serial port module (UART) based on SEMTECH's SX1276 RF chip. It has multiple transmission modes, working in the 862MHz~931MHz, LoRa spread spectrum technology, TTL output. SX1276 features LoRa™,which will bring longer communication distance and has the advantages of concentrated power density, meanwhile it has a very strong confidentiality. the modules of 110.
2.2 Operating parameter Main parameter Performance Operating voltage（V） Min Typ. Max. 2.3 5.0 5.5 Communication level（V） Remark ≥5.0 V ensures output power For 5V TTL, it may be at risk of 3.
3 Size and pin definition No. Name Direction 1 GND Ground 2 GND Ground 3 GND Ground 4 GND Ground 5 M0 6 M1 7 RXD Input （weak pull-up） Input （weak pull-up） Input Function With M1, the four working modes of the module can be determined (it cannot be suspended, and it can be grounded if it is not used). With M0, the four working modes of the module can be determined (it cannot be suspended, and it can be grounded if it is not used).
10 VCC Positive reference of module power supply, voltage range: 2.3v ~ 5.2v DC 11 GND Ground 12 NC 13 GND 14 NC 15 NC 16 NRST 17 NC 18 NC 19 GND Ground 20 GND Ground 21 ANT Antenna 22 GND Ground Ground 4 Connect to MCU Description（STM8L MCU） No. 1 The UART module is TTL level. 2 For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin. Shanghai Smart Control Co., Ltd.
5 Function description 5.1 Fixed transmission 5.2 Broadcasting transmission 5.3 Broadcasting address For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04; Shanghai Smart Control Co., Ltd.
When module is the transmitter (transparent transmission), all modules under channel 0x04 will receive the data, the purpose of broadcast is realized. 5.4 Monitor address For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04; When module A is the receiver, it can receive the data sent from all modules under channel 0x04, the purpose of monitor is realized. 5.
5.6.2 Indication of wireless transmitting Buffer (empty): the internal 512 bytes data in the buffer are written to the RFIC (Auto sub-packaging). When AUX=1, the user can input data less than 512 bytes continuously without overflow. Buffer (not empty): when AUX=0, the internal 512 bytes data in the buffer have not been written to the RFIC completely.
For function 1 & function 2 mentioned above, the priority should be given to the one with low level output, which means if 1 it meets each of any low level output condition, AUX outputs low level, if none of the low level condition is met, AUX outputs high level. 2 3 4 When AUX outputs low level, it means the module is busy & cannot conduct operating mode checking. Within 1ms since AUX outputs high level, the mode switch will be completed.
immediately. Then the module will transmit all the data through wireless transmission & go dormancy 1ms later automatically, which reduces MCU working time & save power. Likewise, this feature can be used in any mode-switch. The module will start to work in new mode within 1ms after completing present mode task, which enables the user to omit the procedure of AUX inquiry and switch mode swiftly.
6.4 Power-saving mode (mode 2) When M1 = 1 & M0 = 0, module works in mode 2 UART is closed, the module cannot receive any serial port data from outside MCU. Hence the function of wireless transmission is not available for the module working in this mode. Transmitting In mode 2, it is required the data transmitter works in mode 1. The wireless module monitors the preamble code at regular time.
7.1 Default parameters Default parameter values：：C0 00 00 1A 17 44 Model Frequency Address Channel Air data rate Baud rate Parity HY915T20S 915MHz 0x0000 0x06 2.4kbps 9600 8N1 Transmitting power 110.24 dBuV/m 7.2 Reading operating parameters Instruction format C1+C1+C1 Description In sleep mode（M0=1，M1=1）， User gives the module instruction (HEX format): C1 C1 C1, Module returns the present configuration parameters. For example, C0 00 00 1A 17 44. 7.
2 3 ADDL SPED Low address byte of module 00H-FFH （the default 00H） 7 6 UART parity bit 0 0 8N1 (default) 0 1 8O1 1 0 8 E1 1 1 8N1 (equal to 00) 5 4 3 0 0 0 1200 0 0 1 2400 0 1 0 4800 0 1 1 9600 (default) 1 0 0 19200 1 0 1 38400 1 1 0 57600 1 1 1 115200 2 1 0 Air data rate（bps） 0 0 0 0.3k 0 0 1 1.2k 0 1 0 2.4k (default) 0 1 1 4.8k 1 0 0 9.6k 1 0 1 19.2k 1 1 0 19.2k (same to 101) 1 1 1 19.
5 4 3 wireless wake-up time 0 0 0 250ms (default) 0 0 1 500ms 0 1 0 750ms 0 1 1 1000ms 1 0 0 1250ms 1 0 1 1500ms 1 1 0 1750ms 1 1 1 2000ms The transmit & receive module work in mode 0, whose delay time is invalid & can be arbitrary value. The transmitter works in mode 1 can transmit the preamble code of the corresponding time continuously. When the receiver works in mode 2, the time means the monitor interval time (wireless wake-up).
Please pay attention to the correct connection of the positive and negative poles of the power supply.
The power supply low voltage under room temperature is lower than 2.5V, the lower the voltage, the lower the transmitting power. Due to antenna quality or poor matching between antenna and module. 9.2 Module is easy to damage Please check the power supply source, ensure it is in right range. Please check the stability of power source, the voltage cannot fluctuate too much.
10.2 Reflow soldering curve 11 Package for batch order Note: only 915MHz is used by USA, other frequency bands will be banned . Shanghai Smart Control Co., Ltd.
Revision history Version Date Description 1.00 2021-5-13 Initial version Issued by Linson FCC Warning: Please take attention that changes or modification 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.
(6) Antenna Change Notice to Host manufacturer If you desire to increase antenna gain and either change antenna type or use same antenna type certified, a Class II permissive change application is required to be filed by us, or you (host manufacturer) can take responsibility through the change in FCC ID (new application) procedure followed by a Class II permissive change application.
