ARCTECH YL-900IL-915M Wireless Transceiver User Manual

ARCTECH YL-900IL-915M Wireless Transceiver User Manual

General

YL_900IL_915MHz is a low cost, medium power, high performance transparent two way semi duplex LoRa modulation transceiver with operation at 868/915Mhz. It integrates with high speed MCU from ST and high performance RF IC SX1276. Adopting high efficiency forward error correction with interleaving encoding (FEC) technology, it makes anti-interference ability and reception sensitivity greatly improved. That guarantees good performance in the harsh environment such as some industrial application. The FEC technique is advanced and unique in radio data communication field. has the UART/RS232/RS485 interface, that make it is easy to implement wireless data
transmission. It is flexible for users to set the baud rate, frequency, output power, air data rate etc parameters.

It can transmit transparent data with large data buffer and also can provide over 32  hannels. The compact size makes it an ideal option for radio data communication application.

Features

• 10000 meters of communication distance（300bps）
• Output power: Max 500mW (27dBm) (7 levels adjustable)
• Air data rate: 300 – 19200bps, can be configured through RF tool
• UART data rate: 1200 – 57600bps, can be configured through RF tool
• Frequency: 868MHZ-915MHZ
• Working Current: 450mA(TX), 24.2mA(RX), 1.2mA(idle), 220uA(Sleeping)
• More than 32 channels
• parity of series COM: 8E1/8N1/8O1
• LoRa modulation
• Receive sensitivity: -148dBm(@300bps)
• UART/TTL, RS232, RS485
• Exceed 256 bytes data buffer
• Supply Voltage: 4.5 – 15.0V (the ripple less than ±100mV )
• Simply tool for configuration
• 62.5KHz- 500KHz Channel spacing
• Dimension: 59.5mm x 39.6mm x 7.0mm

Application

• Automated Meter Reading (AMR)
• Remote control, remote measurement system
• Access control
• Data collection
• Identification system
• IT household appliance
• Baby monitoring system

Maximum specification

Pin Out

YL_900IL_915MHz module has 5 pins. Refers to the Table 1：
Table 1: Pin definition

YL900IL_915MHz

Pm NO| Pin Name| Description
1| VCC| Power supply DC 4.5V-15.5V
2| GND| Grounding of Power Supply
3| RXD| Serial input. 485±/485A
4| TXD| Serial output, 485-/485B
5| AUX| Data in/out indication

Working mode

• a. Standard mode
  Standard mode is also called transparent mode in which the module receives from or sends data to the host through serial port (RS232 or RS485) at preset data format and users don’t need to care about the process of data inside the module. The AUX pin of will give indication about the data IN/OUT of serial port 2ms in advance in order to wake up the host.
  The module just uses the modulation method of lora, not the technology of lora.
  Table 1: Pin definition
  Timing Sequence in Standard Mode

• b. Low power mode
  In this mode YL_900IL _915MHz enables serial port and CAD monitor which means the module monitors the wireless link periodically. When it detects the wireless signal in the wake up period, it will open the receive circuit, pick out the effective data and transfer it to the host through the serial port. The AUX pin will produce a low=level signal 2ms in advance to inform he host that the data comes.
  Timing Sequence in Low Power Mode

• c. Sleep mode
  In this mode most functions of the modules are disabled so if two modules are set to the Sleep Mode, they can’t communicate with each other so one module must be in Low Power Mode. Comparing to Low Power Mode, the modules in SLEEP MODE will not enable serial port and only keeps CAD monitor. When it detects effective wireless signal, it will then enable the serial port. If there is no data In/Out in 1 second, itwill close the serial port and continue the CAD monitor
  Timing Sequence in Sleep Mode

Dimension

Figure 1: Size of Module

Parameter Configuration

Through serial port or using setting tool ‘Rf-Tool’, users can configure relative parameters such as frequency, UART rate, air rate, checkout mode and so on.

It is very simply for configuration. Based on different requirement, all options can be selected visually. It is shown in Table 2 and Figure 2.

Table 2: Parameter Specification

longer air transmission time
RF_BW| Lora bandwidth. Larger value means lower sensitivity. Recommended
value: 125K
Node ID| Reserved
Net ID| Only the modules with the same network ID can communicate with
each other. It can avoid interferences from irrelative modules
Power| It is used to set the output power . There are 7 power levels. The 7
means the max output power—27dBm and 1 means the lowest
output power.
Serial baud rate| It defines the data rate between and the host
Serial parity| It defines the parity check between and the host

Figure 2: Interface of RF Tool

Users can configure the parameters (frequency, data rate, output power, RF Factor, RF Bandwith etc.)through PC or in circuit.

• Setting through PC. port is UART/TTL. When connecting with PC, users need to use USB adapter. App con Wireless provides USB adapter as accessory. The schematic is shown in Figure 3Firstly users connect converter board to PC through DB9 cable and open ‘RF Tool’, then insert module into converter board. After that, the status column of ‘RF tool’ will give a indication ‘Found Device’. Users then can read/write the module.
  If users connect USB converter, USB drive ’’PL-2303_Driver_Installer’’need be installed firstly. The drive has different version for different OS. USB converter has five wires with five different colors: Black, Red, Blue, Yellow. Black wire is GND pin. Red wire is VCC pin. Blue wire is TXD pin.
  Figure 3: The connection diagram

• Setting in circuit . Users also can use microcontroller to change the default parameters. The work mechanism is the same as in PC.
  Sync Word| ID cod e| Header| Command| Length| Data| CRC| End code
  ---|---|---|---|---|---|---|---
  OxAF| OxAF| Ox00| Ox00| OXAF| XX| YY| LEN| =X.| C’S| OXOD| OXOA

YL_900IL_915MHz Command Structure

Notes: 1. The ID code is 0x00 0x00 in command.

1. In command code, XX in sending command is 0x80 and in response command is 0x00. YY is the command type. The work mode of
   YY| TYPE| YY| TYPE| YY| TYPE| YY| TYPE| YY| TYPE
   ---|---|---|---|---|---|---|---|---|---
   Ox01| write| 0x02| read| 0x03| standard| 0x04| Central| 0x05| Node

Command Type and value

2. Length refers to the data bytes between Length byte and CRC byte which the two bytes are no calculated in the length.
3. Data refers to the detailed parameters which need to be changed.
   Parameter Sequence in Data Section Baudrate| Parity| Frequency| RF_Factor| Model| RF_BW| ID| NetID| Power
   ---|---|---|---|---|---|---|---|---

Parameter Length & Value Range 

value= 433000000/61.035
RF_Factor| 1 byte| 7=128, 8=256, 9=512, 10=1024, 1=2048, 12=4096
Mode| 1 byte| 0=standard, 1=low power, 2=sleep
RF_BW| 1 byte| 6=62.5k, 7=125k, 8=250k, 9=500k
ID| 2 bytes| 0x0000 ~ 0xFFFF, high byte first
NetID| 1 byte| 0x00~0xFF
RF_Power| 1 byte| 1=9dBm, 2=12dBm, 3=15dBm, 4=18dBm, 5=20dBm, 6=24dBm, 7=27dBm
4. CS refers to CRC code which is the remainder of the sum of data section divided by 256 In order tounderstand the command, the section will demonstrate the use of commands by some examples.
Write Command Code: 0x01
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x01, 0x0C, …. CS, 0x0D, 0x0A
Response.: 0xAF, 0xAF, 0x00, 0x00, 0xA F, 0x00, 0x01, 0x0C, …. CS, 0x0D, 0x0A
Read Command Code: 0x02
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x02, 0x02,0x00,0x00,0x91, 0x0D, 0x0AResponse.: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x00, 0x02, 0x02,0x00,0x00,0x91, 0x0D, 0x0AStandard Mode Command Code: 0x03
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x03, 0x02, 0x00, 0x00, 0x92, 0x0D, 0x0A
Response.: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x00, 0x03, 0x02, 0x00, 0x00, 0x92, 0x0D, 0x0A
Central Mode Command Code: 0x04
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x04, 0x02, 0x00, 0x00, 0x93, 0x0D, 0x0A
Response.: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x00, 0x04, 0x02, 0x00, 0x00, 0x93, 0x0D, 0x0A
Node Mode Command Code: 0x05
Command: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x80, 0x05, 0x02, 0x00, 0x00, 0x94, 0x0D, 0x0A
Response.: 0xAF, 0xAF, 0x00, 0x00, 0xAF, 0x00, 0x05, 0x02, 0x00, 0x00, 0x94, 0x0D, 0x0A
Please note that the working modes changed by the 0x03, 0x04 and 0x05 commands will not be written into nonvolatile memory so the working mode will be restored to the former mode before change after power-off. Users can use the WRITE command to change the working mode of module to standard mode or low power mode but the sleep mode will be restored to standard mode after next power-on even if the WRITE command is used.

Application Schematic

The connection schematic between YL_900IL_915MHz and MCU or terminal is shown as below.
The parameter of serial port must match with MCU or terminal’s (has the same serial port baud rate and parity style with MCU or terminal). Two or more in a system should have the same parameters such as TX/RX frequency, air date rate and RF channel.

Figure 7: Connection between Module and Device(TTL/RS232 port)
Figure 8: Connection between Module and Device(RS485 port)

Constructing Network (one point to multi-point)

is a semi-duplex module, which can be communicated by point to point or one point to multipoint.

In the second mode, user needs to set one master module, while the others are slave modules. Every
module must only have one unique ID. The coordination of communication is controlled by the master module, which sends data or commands including ID information. All slave modules can receive the data packets, and compare the ID with itself. If they are matched, the module will deal with the data packets. Otherwise, it will discard them. In order to avoid interfering each other, only one module can be in transmitting state when the network is working. can set many different frequencies so that many networks can work in the same place and at the same time.

User should pay attention to the following questions based on the complex transfers in the air and some inherency characteristics of wireless communication:

1. Latency of wireless communication
   The wireless terminal keeps receiving data packets after waiting for a while to ensure no data any more. There should be tens to hundreds mil-seconds latency from transfer to receiver (the  exact latency depended on UART rate, air rate and the size of data package). In addition, it also need consume some time to transmit from module to terminal, but the delay time is permanent in the same condition.

2. Data flux control
   Although there is a buffer zone with 256 bytes in the wireless module, when the UART rate is higher than the air rate, there must be a problem about the data flux. It may cause to lose some data because the data over flow from the buffer. Under this condition, it must be ensured that the average UART rate should NOT higher than 60 percent of the air rate. For instance, the UART rate is 9600bps, the air rate is 4800bps. If UART rate is the same as the air rate, the only way is to interval the transmitting time. If terminal transmits100bytes to UART every time, it will take 104ms every time. (104ms/0.6)*(9600/4800) =347ms. So if the interval time that terminal transmit 100bytes to UART should NOT less than 347ms every time, those mentioned problems can be avoided.

3. Error control
   The wireless network module has strong capability of anti-interference because of the high efficiency checking error correction with interleaving encoding technology. However, when it is in a bad circumstance that has strong electric interference, the data may be lost or receive some error data. User can increase the development of the system link layer protocol. For instance, if user can increase TCP/IP slip window and repeat transmitting functions, it will improve the reliability and ability of wireless network communication.

4. Selection of antenna
   Antenna is a very important factor of the communication system. The quality of antenna impacts the capability of communication system. So user should strictly choose the quality of antenna. Generally speaking, it mainly contains two points: the type of antenna (size) and its electric capability. The antenna must be matched with the frequency of communication system.

Q&A

Questions and Answers

Cannot
communicate
between two
devices| 1 .The communication protocol is different between two modules, for instance: data rate and checkout.
2. The frequency or RF data rate is different between two communicated modules.
3. They are not the same kind products.
4. The connection between module and terminal is wrong.
5. The module is wrong.
6. The setting of EN is wrong.
7. The communication distance exceeds the range. or the connection of antenna is bad.
Short communication distance|

1. The supply voltage exceeds range

2. The ripple of power is too big.
3. The connection of antenna is bad or it is a wrong kind of antenna
4. Antenna is too close to the surface of metal or the ground
5. Receiving circumstance is very bad, for instance buildings and strong interference.
6. There is interference of the same frequency
Receive wrong data|

1. Wrong setting of COM, for example, Baud rate is wrong

2. The connection of UART is wrong.
3. The cable to the UART is too long.
APPCON WIRELESS TECHNOLOGIES CO.,LTD

Add: 28#, Longjin road,Xili zone, Nanshan District Shenzhen P.R.C(518043) TEL: +86-185 0309 2598
FAX: +86-755-83405160
Email: sales@appconwireless.com
Web: http://www.appconwireless.com

| AppconWireless technologies reserves the right to make corrections, modifications, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers are expected to visit websites for getting newest product information before placing orders. These products are not designed for use in life support appliances, devices or other products where malfunction of these products might result in personal injury. Customers using these products it such applications do so at their own risk and agree  to fully indemnify Appcon Wireless technologies for any damages resulting from improper use
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FCC Statement

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.

Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

This equipment should be installed and operated with a minimum distance of 20cm between the  radiator and your body.

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.

Host product manufacturers that they need to provide a physical or e-label stating, “Contains FCC ID:2AWQQ-YL-900IL-915M” with their finished product. Only those antennas with same type and lesser gain filed under this FCC ID can be used with this device. The host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification.

The final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed. The final host integrator must ensure there is no instruction provided in the user manual or customer documentation indicating how to install or remove the transmitter module except such device has implemented two-ways authentication between module and the host system. The final host manual shall include the following regulatory statement: This equipment has been tested and found to comply with the limits for a 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.

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