Tesenso M-Bus LoRaWAN

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Tesenso M-Bus QuickStart Guide V4-EN.pdf

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Tesenso M-Bus Datenblatt 1.3.pdf

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Datasheet EN

Uplink documentation

V2.0 (currrent version)

M-BUS message formats

Name:	Length	MsgType	Data depending on MsgType
Unit:		Enum
Bytes
Range:	0..255	0..127

Uplink message ports

Uplink message port:	2
Uplink message port for split messages	12
Status Uplink message port:	50

ENUM definitions

MsgType Enum
0	0	Status message
1	1	Scan Result
2	2	Telegram Response
3	3	Read Meter
4	4	Read Meter Raw
...
123	7B	HW_ID_UL
124	7C	MCU_ID_UL
125	7D	Firmware_hash
Port for ID-s (123-125) is 200

Message Types

0: Status message

Port 50

Name:	Length	MsgType	Voltage	Temp	Saved slaves	Read interval	Flags	Status interval
Unit:		Enum	1/100 -170		Count	Min(s)		Min(s)
Bytes	1	1	1	1	1	1	1	MSB	LSB
Range:	8	0
Example	08	0
08 00 9e 30 00 03 a0 05 a0

1: Scan Result

Name:	Length	MsgType	slave addresses
Unit:		Enum
Bytes	1	1	X
Range:		1

2: Telegram Response

Name:	Length	MsgType	Slave response
Unit:		Enum
Bytes	1	1	X
Range:		2

3: Read Meter

3: Read Meter		Meter properties block	Meter properties block
Name:	Length	MsgType	no. of slaves	ID	Medium	VIF	Volume	...
Unit:		Enum	count	BCD encoded			BCD encoded
Bytes	1	1	1	1	1	1	1	1	1	1	1	1	1	10
Range:		3		HighByte			LowByte			HighByte		LowByte

4: Read Meter Raw

Port 2

					Has to be decoded in the backend (contains all information)
Name:	Length	MsgType	Slave No.	Full response telegram
Unit:		Enum	Byte
Bytes	1	1	1	X
Range:		4

4: Read Meter Raw SPLIT

Port 12

						Has to be decoded in the backend (contains all information)
Name:	Length	MsgType	Slave No.	Pointer	Full response telegram
Unit:		Enum	Byte	Byte
Bytes	1	1	1	1	X
Range:		4

123: HW_ID_UL

Name:	MsgType	HWID
Unit:	Enum	version
Bytes	123
Range:		0..7

124: MCU_ID_UL

Name:	MsgType	MCU_ID
Unit:	Enum
Bytes	124	HighByte			LowByte
Range:

125: Firmware_hash_UL

Name:	MsgType	Firmware version and hash
Unit:	Enum	String
Bytes	125	Size varies
Range:

V2.1

Uplink Decoder

// V3.0 10.05.2022, copyright by Tesenso GmbH

//Code entry
if (msg.data) {
    var decoded = decodeFromHex(msg.data);
    decoded.ts = msg.ts;
    decoded.rssi = msg.rssi;
    decoded.snr = msg.snr;
    decoded.toa = msg.toa;
    decoded.frequency = msg.frequency;
    decoded.dr = msg.dr;
    decoded.bat = decodeBattery(msg.bat);
    decoded.hex = msg.data;

    return {
        msg: decoded,
        metadata: metadata,
        msgType: msgType
    };
} else {
    return {
        msg: msg,
        metadata: metadata,
        msgType: msgType
    };
}


function decodeFromHex(data) {
    // Decode uplink message
    var decoded = {};

    //Parse string as bytes
    var bytes = parseHexString(data);
    //scale to manage the different scales with none, one or more decimals on the meter.
    var scale = metadata.ss_scale;

    //various info that can be extracted
    var length = bytes[0];
    var msgType = bytes[1];
    var slaveCount = bytes[2];
    var startCharacter1 = bytes[3];
    var length1 = bytes[4];
    var length2 = bytes[5];
    var startCharacter2 = bytes[6];
    var c = bytes[7];
    var a = bytes[8];
    //72 or 76 -> variable; 73 or 77 -> fixed
    var ciField = bytes[9];
    var medium = data.substr(34, 2);
    var checkSum = bytes[36];


    //Different medium IDs, register positions vary
    if (medium == "02") {
        var volume = data.substr(72, 2) + data.substr(70,
            2) + data.substr(68, 2) + data.substr(66, 2);
        decoded.electricityMeterEnergyHt = parseInt(volume,
            16) * scale;
        volume = data.substr(88, 2) + data.substr(86, 2) +
            data.substr(84, 2) + data.substr(82, 2);
        decoded.electricityMeterEnergyNt = parseInt(volume,
            16) * scale;
    }
    if (medium == "03") {
        var volume = data.substr(66, 2) + data.substr(64,
            2) + data.substr(62, 2) + data.substr(60, 2);
        decoded.gasMeterVolume = parseInt(volume) * scale;
    }
    if (medium == "16") {
        var volume = data.substr(54, 2) + data.substr(52,
            2) + data.substr(50, 2) + data.substr(48, 2);
        decoded.waterMeter = parseInt(volume, 16) * scale;
    }

    return decoded;
}

//Helper functions
function parseHexString(hex) {
    for (var bytes = [], c = 0; c < hex.length; c += 2)
        bytes.push(parseInt(hex.substr(c, 2), 16));
    return bytes;
}

function decodeBattery(byte) {
    if (byte == 0) {
        return 'External power source';
    } else if (byte > 0 && byte < 255) {
        return byte / 254 * 100;
    } else {
        return 'Unknown battery state';
    }
}

function parseFloat(str) {
    var float = 0,
        sign, order, mantissa, exp,
        int = 0,
        multi = 1;
    if (/^0x/.exec(str)) {
        int = parseInt(str, 16);
    } else {
        for (var i = str.length - 1; i >= 0; i -= 1) {
            if (str.charCodeAt(i) > 255) {
                console.log('Wrong string parameter');
                return false;
            }
            int += str.charCodeAt(i) * multi;
            multi *= 256;
        }
    }
    sign = (int >>> 31) ? -1 : 1;
    exp = (int >>> 23 & 0xff) - 127;
    mantissa = ((int & 0x7fffff) + 0x800000).toString(2);
    for (i = 0; i < mantissa.length; i += 1) {
        float += parseInt(mantissa[i]) ? Math.pow(2, exp) :
            0;
        exp--;
    }
    return float * sign;
}

All Downlinks shall be sent on Port 3

Downlink samples

Add secundary adress manually to EEPROM

Name:	Length	MsgType	ID
Unit:		Enum	BCD encoded
Bytes	1	1	1	1	1	1
Range:	5	133	HighByte			LowByte

• 05 --> Length

• 85 --> MsgType

• 17670401 --> secondaryAdress of the meter

058517670401

Downlink for Scan M-Bus slave on the M-Bus

Name:	Length	MsgType	Retry
Unit:		Enum
Bytes	1	1	1
Range:	2	130	0..3

• 02 --> Length

• 82 --> MsgType

• 01 --> Retry

028201

Delete saved slaves from EEPROM

Name:	Length	MsgType
Unit:		Enum
Bytes	1	1
Range:	1	131

• 01 --> Length

• 83 --> MsgType

0183

Change send Intervall:

Message Types
Name:	Length	MsgType	Flags	status msg interval	Meter interval
Unit:		Enum		Min(s)	Min(s)
Bytes	1	1	1	MSB	LSB	1
Range:	0..255	128

sample downlinks to change the intervall:

• 05800000001E --> 30 minutes

• 05800000000F --> 15minutes

• 058000000005 --> 5minutes

Troubleshoot Checklist:

• take a photo of the meter and the full installation

• power device

• make sure that the connection (wires/cables) are connected correctly