FCC ID: 2AVBL-VC1SX LoRa Mesh Wireless Transceiver Module

File name: vc1sx-1276b-g4 wireless module used Documentation Document Number: vc-qw-0a-2017-10 Date: 2017.10.27 Implementation date:

2017.10.27 vc1sx-1276b-g4 wireless module Use document v1.1 Preparation / Date: 2017-07-

10 Audit / Date: 2017-07-11 Approval / Date: 2017-07-12 Shanghai Entropy Internet of Things Technology Co., Ltd. 1 19 File name: vc1sx-1276b-g4 wireless module used Documentation Document Number: vc-qw-0a-2017-10 Date: 2017.10.27 Implementation date:

2017.10.27 version number editor V1.0 V1.1 Li Teng Pei Liqun Version v1.1 time 2016-08-02 2017-03-25 instruction manual Initial version, all functions are implemented Add test bit error rate Version v1.1 ......................................................................................................................................................... 2 1.Description ....................................................................................................................................................... 4 Application field ................................................................................................................................................ 4 3.Technical characteristics ............................................................................................................................. 5 4.Technical parameters ...................................................................................................................................... 6 5.Interface definition ...................................................................................................................................... 7 6.Serial communication protocol ...................................................................................................................... 8 6.1. Data Frame ........................................................................................................................................................ 9 6.1.1. 6.1.2. Delivery (module serial port receiving) .......................................................................................... 9 Data frame upload (wireless data reception completion triggers module serial port transmission) .............................................................................................................................................................. 9 6.1.3. 6.1.4. 6.2. 6.3. 6.4. About address ........................................................................................................................................... 10 Recommended minimum interval for serial port transmission .................................................... 10 Command frame ................................................................................................................................................ 10 Parameter settings are not read ............................................................................................................ 13 set_a, aux, set_b foot definition ........................................................................................................ 15 6.5. Configuration Tool ...................................................................................................................................... 15 7.Precautions for RF frequency point selection ........................................................................................ 16 8.Transmit power and receiving sensitivity test ...................................................................................... 16 9, attached: ....................................................................................................................................................... 17 9.1, version information ...................................................................................................................................... 17 9.2. Command frame crc16 algorithm .................................................................................................................. 17 2 19 File name: vc1sx-1276b-g4 wireless module used Documentation Document Number: vc-qw-0a-2017-10 Date: 2017.10.27 Implementation date:

2017.10.27 9.3. Examples ............................................................................................................................................................ 18 9.4 Parameter setting packing instruction ............................................................................................... 19 10. Technical support and after-sales service .......................................................................................... 19 3 File name: vc1sx-1276b-g4 wireless module used Documentation Document Number: vc-qw-0a-2017-10 Date: 2017.10.27 Implementation date:

2017.10.27 1.Description VC1SX-1276B type wireless communication module is highly integrated with ultra-low-

power half-duplex micro-power wireless data transmission module, using LORA chip SX1276, embedded with high-speed single-chip microcomputer and high-performance radio frequency chip. LoRa TM spread spectrum modulation frequency hopping technology, communication The distance and receiving sensitivity are far beyond the current FSK and GFSK modulation. Multiple transmission signals occupy the same channel and are not affected. It has strong anti-interference. VC1SX-1276B wireless communication series modules provide flexible channels. Various parameters such as settings, transmit power, frequency, etc. At the same time, the module has a low-power sleep function, and the sleep current is less than 2.5uA;

the module supports the low-power carrier sensing protocol, and the module can automatically exit from sleep at regular intervals to listen to air data, It automatically sleeps after data transmission, which is convenient for various battery-powered systems, especially gas meters and water meters. The VC1SX-1276B-G4 module has a built-in LoraMesh protocol independently developed by entropy weight, which supports routing networking of up to three hops. The user does not need to intervene, and the networking is autonomous, automatic, and self-healing. When using LoraMesh, it can not be configured into sleep mode. Application field Environmental monitoring, road dust monitoring Car anti-theft, tire pressure monitoring and four-wheel alignment Automatic meter reading and charging system for water, electricity and gas Industrial remote control for cranes and cranes Production line data acquisition and data communication Automatic control of medical electronic appliances Wireless wireless intelligent control Security alarm and attendance and positioning of underground personnel Wireless pos system Channel buoy and LED display in field Highway toll collection system Wireless hanging scale, electronic scale with wireless transmission Bank queue management system 4 3.Technical characteris ticsSerial data is directly transparently transmitted, and a single frame of data is up to 242 bytes;

Uses and spread spectrum modulation technology, ultra-low sensitivity, extremely long distance transmission; the maximum transmission distance is greater than 7000 meters / 300kbps, the height is greater than 5 meters, non-urban open distance; the product supports frequencies of 915.8 MHz - 918.5MHz;

100mW transmit power;

Very low receiving sensitivity -112dBm /

9.6kbps @GFSK; using TTL interface;

Multi-channel can be set, send and receive 200Bytes data buffer;

External epson 32.768k RTC crystal to ensure product consistency in meter reading applications; built-in watchdog, external rf industrial grade crystal to ensure product stability. 5 4.Technical parameters parameter Smallest typical maximum unit condition Working voltage range range of working 1.8

-40 temperature Operating conditions 3.3 3.6 85 V Current consumption Receive current Emission current Sleep current 17 115

<3 mA mA uA Modulation 0.018 rate Transmit power 1 range Receiving sensitivity Initial crystal frequency Frequency deviation deviation Frequency offset Frequency deviation contact air

@20dBm LoraTM RF parameters 37.5 kbps 20 dBm

-110 dBm

@GFSK 4.8kbps BER<1%

10 15

<5 15 10 20 ppm ppm khz ppm kv kv ESD

-20--75 degrees Celsius

-40--85 degrees Celsius 915M

-40--85 degrees Celsius Antenna Antenna 6 5.Interface definition vc1sx-1276b provides a 7-pin connector (con1), the definition of which is based on the terminal connection method as shown in the following table:

Pin definition Level direction 1 2 3 4 5 6 7 GND VCC SET_A RXD TXD AUX SET_B I I O O I Description Power ground Current is greater than 150MA, ripple is less than 50mv Reserved io Serial data receiver

(Serial data transmitter) Reserve Reserve 7 Figure 1. Product Dimensions 6.Serial communication protocol The factory default setting of the serial port is 4800 baud, 8E1 type of data Command frame protocol Answer Description 55 AA LEN CMD SUB_CMD 55 AA LEN CMD 01 DATA CRC16 16 SUB_CMD 02 DATA len: total package length

(length from 55 to 16 Degree) cmd: set command sub_cmd:

subcommand data:

set value CRC16 16 8 crc16: 55 to data crc16 value, low byte first, high byte last See 6.2 for the definition of each command frame This data does not require crc verification 08 AA Data Frame Abnormal response Error frame 6.1. Data Frame Delivery (module serial 6.1.1. port receiving) Format: destination address (4 bytes) + payload (maximum 242 bytes) Once the module serial port receives a data frame, it will reply immediately 0x08 means confirm the serial port reception, and it 1) will start wireless transmission 0xAA means there is an error in the frame format or 2) it is not suitable for sending a) When the destination address is a local address, the transmission is refused, and the serial port returns 0xAA. b) When the destination address is 0xAA 0xAA 0xAA 0xAA, it means broadcast transmission. When the data frame is received, the wireless is in the process of sending, the new 3) data frame is rejected, and the serial port returns 0xAA. Data frame upload (wireless data reception 6.1.2. completion triggers module serial port transmission) 9 Format: source address (4 bytes) + destination address

(4 bytes) + payload 1) Source address: The source node address of the wireless data corresponding to this serial transmission 2) Destination address: The destination node address of the corresponding wireless data transmitted by the serial port, that is, the local address or broadcast address 10 6.1.3. About address The byte order of the address is not configured in the frame (see the command frame). The byte order given by the sample module is factory configured. The address gives an 8-bit bcd code for the label. For example, if the label is "06130273", the preset address is 0x06 0x13 0x02 0x73 Recommended minimum interval for serial port 6.1.4. transmission For modules that actively initiate data, in order to prevent information collision, according to the minimum transmission interval of the last transmission or reception, it is not recommended to initiate data. Among them, the transmission interval can be considered as the source serial information arrives through three hops (two-level routing) and arrives. The time required by the target serial port. Transmission interval / sec. SF 7 8 9 10 11 12 10 0.6 0.7 1 1.6 2.6 4.9 Payload / Byte 30 0.7 0.9 1.4 2.2 3.9 6.9 100 200 242 1.3 1.8 2.5 4.6 7.7 1.9 2.8 4.5 7.8 2.3 3.4 5.3 9 13.3 15.6 13.9 23.7 27.7 20 0.6 0.8 1.2 2 3.4 5.9 6.2. Command frame protoco 55 AA LEN CMD SUB_CMD 01 DATA CRC16 16 l 11 len: total package length (length from 55 to 16) Features cmd: set command sub_cmd:

Descrip tion subcommand, 00 without subcommand: set value 12 crc16: 55 to the crc16 value of data, low byte first, high byte last Serial input Serial port 55 AA LEN 05 01 01 FAD_L FAD_H N DATA CRC16 16 55 AA LEN 05 01 02 FAD_L FAD_H N DATA CRC16 16 loopback CMD:05 SUB_CMD: 01 Setting parameters Descrip tion fad_l, fad_h: the first address of the parameter storage n: the number of parameter bytes data: n bytes of parameter data Serial input Serial port loopback Reading parameters 55 AA LEN 05 00 01 FAD_L FAD_H N CRC16 16 55 AA LEN 05 00 02 N DATA CRC16 16 CMD:05 SUB_CMD: 00 Descrip tion fad_l, fad_h: the first address of the parameter storage n: the number of parameter bytes data: n bytes of parameter data Serial input Serial port 55 AA 0F 00 00 01 XX A0 A1 A2 A3 A4 CRC16 16 55 AA 0F00 00 02 XX A0 A1 A2 A3 A4 CRC16 16 Wake frame loopback CMD:00 Descrip tion SUB_CMD: 00 xx: network id, ff time distinguishes network id a0-a4: rf module address that needs to wake up, broadcast call when a0-a4 is aa 13 Wake rf module Serial input Serial port loopback Descripti on Serial input Serial port 55 AA 0E 01 00 01 A0 A1 A2 A3 A4 CRC16 16 55 AA 0E 01 00 02 A0 A1 A2 A3 A4 CRC16 16 CMD:01 SUB_CMD: 00 The module receives this command frame, and the module enters the sleep state after responding 55 AA 0A0200 0100 CRC16 16 55 AA 0A0200 02 X CRC16 16 loopback CMD:01 Descripti on Serial input Serial port Descripti loopback on Serial input Serial port Descripti loopback on Serial input Serial port Descripti loopback on SUB_CMD: 00 X: the signal strength value of the last communication, this value is the absolute value of the signal strength, for example 36, it means that the signal strength is -

55 AA 09 0B 00 01 49 C4 16 54dBm 55 AA 09 0B 00 02 D2 F6 16 55 AA 09 07 00 01 EA 61 16 55 AA 09 07 00 02 71 53 16 The module starts the reception test.At this time, if the bit error rate is less than 1%, the module's red light 55 AA 09 08 00 01 2D 2B 16 flashes evenly. 55 AA 11 08 00 02 XX XX XX XX YY YY YY YY CRC16 16 Where xxxxxxx is the number of error bits, yyyyyyyyy is the total number of bits, the bit error rate, xxxxxxxxx / yyyyyyyyyy, low first Sleep frame Signal strength indicator Send power test command Receive sensitivi ty test command Read bit error rate command 14 6.3. Parameter setting and reading Note: After the wireless module sets the parameters, the new wireless parameters are enabled after the wireless module is powered off and then powered on. param eter Store first address 0x100 0 Inter actio n long Frame format Description degr ee 3 Assu me Set 55 AA 0F05 01 01 00 10 03 BR_LBR_H:

BR_L BR_H FCRC16 16 Low and high byte of serial baud rate Baudrate Inte rfac e comm unic atio n para mete rs wirel ess Frequ ency 0x100 3 3 Modul 0x100 6 6 e seri al numb er read 55 AA 0C 05 00 01 00 10

/ 100 take 03 CRC16 16 f: Serial data format 1: 8n1 28E1 38O1 Serial port default parameters: Baud rate 4800bps, 8E1 Assu me Set read take Assu me 55 AA 0F05 01 01 03 10 03 F_L F_M F_H CRC16 16 F_L, F_M, F_H: Frequency

(kHz) BCD code low middle high 55 AA 0C 05 00 01 03 10 byte, if you need to set 03 CRC16 16 the frequency to 472.125MHz, then F_L, F_M, F_H are 25 21 47, Frequency setting range:

55 AA 1205 01 01 06 10 862 ~ 1020MHz mid: network id number 06MID A0~A4 CRC16 16 a0 ~ a3: module's 5-digit Set read 55 AA 0C 05 00 01 06 10 serial number, which is the address 15 take 06 CRC16 16 Outpu 0x100 1 t power C Assu me Set 55 AA 0D05 01 01 0C 10 01 X CRC16 16 Among them, a4 should be guaranteed to always be 0 x is the power to be set, Values are hexadecimal numbers 01, 02, 05, 08, 0b, 0e, 11, 14 read 55 AA 0C 05 00 01 0C 10 Set the module power to take 01 CRC16 16 1, 2, 5, 8, 11, 11, 14, start 0x100 1 D 0x100 1 E 0x100 1 F up

Forbi dden Carr ier wake

-up Carri func er tion Dete ctio n inte rval Sprea d spect rum facto r 55 AA 0D05 01 01 0D 10 01 X CRC16 16 55 AA 0C 05 00 01 0D 10 01 CRC16 16 respectively. 1720dBm x = 1, disable the carrier wake function

( can sleep) x = 2, enable carrier wake function

(Can sleep) 55 AA 0D05 01 01 0E 10 01 X CRC16 16 x is the time interval for detecting the carrier

(Unit s), the values are 55 AA 0C 05 00 01 0E 10 0, 1, 5, 10, 15, 20, 25 01 CRC16 16 Note: The interval time 55 AA 0D05 01 01 0F 10 01 X CRC16 16 is 0, which means that the wireless module can x: Set the spreading communicate without factor, the range is 7 ~

waking up. 12 The bandwidth is 125KHz, Assu me Set read take Assu me Set read take Assu me Set read 55 AA 0C 05 00 01 0F 10 and the baud rate take 01 CRC16 16 corresponding to the spreading factor is as 16 follows 7: 5.17kbps 8: 2.93kbps 9: 1.63kbps 10: 0.9kbps 11: 0.5kbps 12: 0.27kbps AUX 0x101 1 0 0x101 1 1 Stat us inte rval sett Power ing

-on the mess age stat Assu me Set read take Assu me Set read take 55 AA 0D05 01 01 10 10 01 When STime is in AUX state STime CRC16 16 Unit: min 55 AA 0C 05 00 01 10 10 01 CRC16 16 55 AA 0D05 01 01 11 10 01 X CRC16 16 When x is a0, power on and output version information Information, for other 55 AA 0C 05 00 01 11 10 values, output version 01 CRC16 16 information when power on es 6.4. set_a, aux, set_b foot definition In the vc1sx-1276b-g4 module, these three pins are meaningless. 6.5. Configuration Tool For convenience, the configuration tool wraps the above serial interface interactive commands, and the interface is as follows:

17 7.Precautions for RF frequency point selection 1.The frequency setting range is 915.8 MHz - 918.5MHz, the frequency selection should avoid the integer multiple frequency of the crystal (its accessories 1MHz frequency can not be set) . 8.Transmit power and receiving sensitivity test After the module outputs the version information, you can test the transmit power, receive sensitivity, and sleep current through the serial port setting commands. The test process and commands are as follows Power on and wait for the module to output version information Send power test command: 55 aa 09 0b 00 01 49 c4 16 Serial port response: 55 aa 09 0b 00 02 d2 f6 16, the module enters the transmitting state 18 Receive sensitivity test command: 55 aa 09 07 00 01 ea 61 16 Serial port response: 55 aa 09 07 00 02 71 53 16, 19 The module starts the reception test. At this time, if the bit error rate is less than 1%, the module's red light flashes uniformly. After sending the receive sensitivity test command, it can be delayed for a period of time. 16 Module response 55 aa 11 08 00 02 xx xx xx xx yy yy yy yy crc16 16 Hibernation test: Send the hibernation command, the module enters the hibernation state, and the hibernation state requires the module to be powered on before entering other states. The module needs to be powered on again after the test 9, attached:

9.1, version information The power-on version information displays 36 bytes, such as "VCWF-2E80-DE-XXD20-

20160302-Vsp1.00", where "20160302 is the compilation date and" Vsp1.00 "is the version information 9.2. Command frame crc16 algorithm

#define CRC_POLY 0x8408 unsigned int comCalCRC16(const unsigned char *pucBuf, unsigned int uwLength)

unsigned int uiCRCValue=0xFFFF;

unsigned char ucLoop;

unsigned char * pu8Buf = (unsigned char *)pucBuf;

while(uwLength--)

uiCRCValue ^= *pu8Buf++;

for(ucLoop=0; ucLoop<8; ucLoop++) 20

if(uiCRCValue & 0x0001)

uiCRCValue >>= 1;

uiCRCValue ^= CRC_POLY;

else

uiCRCValue >>= 1;

uiCRCValue ^= 0xFFFF;

return uiCRCValue;

9.3. Examples Configuration frame: 55 aa 1e 05 01 01 00 10 12 30 00 02 25 01 47 05 20 15 03 26 01 11 02 05 0a 01 00 50 2D 16 Wake frame: 55 aa 0f 00 00 01 05 20 15 03 26 01 bb a7 16 Sleep frame: 55 aa 0e 01 00 01 a0 a1 a2 a3 a4 a1 51 16 Data frame: 68 a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 11 22 33 44 55 4b d1 16 68 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 21 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 55 11 22 33 44 23 A1 16 Configure carrier detection time and spreading factor: 55 AA 0e 05 01 01 0E 10 02 05 0b 9.4 Parameter setting packing instruction 55 aa len 05 01 01 fad_l fad_h n data crc16 16, n> = 1, n <= 18, such as 55 aa 1e 05 01 01 00 10 12 30 00 02 25 21 47 05 20 15 03 26 01 11 02 05 0a 01 00 ef 88 16 in Line configuration, read parameters are the same. 9.5 Use distance in FCC Radiation exposure When using a product integrated with the module, the user should be more than 50 cm away from the product. 10. Technical support and after-sales service Our company provides good technical support for users' use and secondary development free of charge; provides one year warranty, after-sales service for life-long maintenance. To meet the different structural needs of customers, our company can also design smaller sizes or Products of the same shape. Building 501 Address: No. 1, 615 Ningqiao Road, Pudong New District, Shanghai 22 Phone: 021-50563240 Fax: 021-50560115 website:

https://www.shangquaniot.com/

FCC Statement 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. 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. The distance between user and device should be no less than 20cm. FCC Caution:

Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. FCC Radiation Exposure Statement:

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. Co-location warning:

This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. Limited Channels fixed for use in the US:

This device is pre-set to only transmit in FCC approved channels from 915.8-918.5MHz. This cannot be changed. OEM integration instructions:

This device is intended only for OEM integrators under the following conditions:

The antenna must be installed such that 20 cm is maintained between the antenna and users, and the transmitter module may not be co-located with any other transmitter or antenna. The module shall be only used with the external antenna(s) that has been originally tested and certified with this module. As long as 3 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements,etc.). 23 Validity of using the module certification:

In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization for this module in combination with the host equipment is no longer considered valid and the FCC ID of the module cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product

(including the transmitter) and obtaining a separate FCC authorization. Custom design antennas may be used, however the OEM installer must following the FCC 15.21 requirements and verify if new FCC approval will be necessary. End product labeling:

This transmitter module is authorized only for use in device where the antenna may be installed such that 20 cm may be maintained between the antenna and users. The final end product must be labeled in a visible area with the following: Contains FCC ID: 2AVBL-VC1SX. Information that must be placed in the end user manual:

The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user's manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual. 24

SingleModular approval Declaration letter We Zhejiang Eastron Electronic Co.,Ltd. apply Single modular approval for Product Name: LoRa Mesh Wireless Transceiver Module Model: VC1SX-1276B-G4 FCC ID: 2AVBL-VC1SX According to 996369 D01 Module Equip Auth Guide v01r04 and 15.212 requirement:

1) The radio elements must have the radio frequency circuitry shielded. Physical components and tuning capacitor(s) may be located external to the shield, but must be on the module assembly;

Answer Yes. The modular equip with own RFshielding. 2) The module must have buffered modulation/data inputs to ensure that the device willcomply with Part 15 requirements with any type of input signal;

Answer Yes All inputs to the modules are buffered through logic or microprocessor inputs. 3)The modular transmitter must have its own power supply regulation. Answer Yes A low drop out regulator is used for modular power supply regulation. 4) The module must contain a permanently attached antenna, or contain a unique antennaconnector, and be marketed and operated only with specific antenna(s), per Sections15.203, 15.204(b), 15.204(c), 15.212(a), 2.929(b);

Answer Yes Device is equipped with integral antenna.

(5) The module must demonstrate compliance in a stand-alone configuration;

Answer YesEUT was test stand alone refer to setup photo.

(6) The module must be labeled with its permanently affixed FCC ID label, or use an electronic display (See KDB Publication 784748 about labeling requirements);

Answer Yes The modular has a permanent fixed label, and below statement was listed in the User Manual;The host device must be labeled to display the FCCID of the module Contains FCC ID: 2AVBL-VC1SX

(7) The module must comply with all specific rules applicable to the transmitter includingall the conditions provided in the integration instructions by the grantee;

Answer Yes The module comply with all specific rules applicable to the transmitter including all the conditions provided in the integration instructions by the grantee, Refer to test report and user manual .

(8) The module must comply with RF exposure requirements Answer Yes The module meets the minimum requirements of RF exposure. Please contact me if you have any further questions. Thanks for your attention. Best Regards, Signature:

Name: Eason Gu Title: sales manager Company: Zhejiang Eastron Electronic Co.,Ltd.

< Zhejiang Eastron Electronic Co.,Ltd.>

Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD21046 Date:12-20-2019 Subject; Request for Long Term Confidentiality FCC ID: 2AVBL-VC1SX To Whom It May Concern, Pursuant to the provisions of the Commissions rules Title 47 Sections 0.457 and 0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Operational Description It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature:

Name: Eason Gu Title: sales manager

Zhejiang Eastron Electronic Co.,Ltd. Letter of Authorization Company: Zhejiang Eastron Electronic Co.,Ltd. Address: No.1369, Chengnan Road, Economic and technological development District, Jiaxing, Zhejiang, China Product Name: LoRa Mesh Wireless Transceiver Module Model Number(s): VC1SX-1276B-G4 Product Description: LoRa Mesh Wireless Transceiver Module We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature:

Date: 2019-12-20 Name:

Eason Gu Title:

sales manager Company: Zhejiang Eastron Electronic Co.,Ltd.