LPN CM-2

The system records temperature and moisture at freely programmable intervals. The data is provided on a network server by means of LoRaWAN® radio technology via gateways.

Decoder/Product Datasheet

Datasheet EN

250KB

Datasheet_LPN-CM-2-EN-V0.31.pdf

pdf

487KB

E1364_CM2-100_AW_SW REV03.00 Specs_EN.pdf

pdf

Device Profile for Tesenso IoT Cloud

588B

cm2_100.json

Decoder/Payload Converter for Tesenso IoT Cloud

https://github.com/Tesenso-GmbH/Device-Decoder/blob/main/Comtac_CM-2.js

//V1.1, 02.02.2022,DS

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) {
    var decoded = {};

    // Calculate the battery status of the sensor (no battery status in payload --> standard calculation)
    //float batteryStatus = BatteryStatus.CalculateBatterStatus((int)rawMessageSection.bat);

    var rawBattery = data.substr(6, 4);
    var intBattery = parseInt(rawBattery, 16);
    //decoded.batteryStatus = intBattery;


    var rawTemp = data.substr(10, 4);
    
    //Check for negative values
    var temporaryTemp = parseInt(rawTemp, 16);
    if ((temporaryTemp & 0x8000) > 0) {
        decoded.temperature = (temporaryTemp - 0x10000)/100;
    }
    else{
        decoded.temperature = temporaryTemp / 100.00;
    }


    var rawTempPT100 = data.substr(18, 4);
    
    var temporaryTempPT100 = parseInt(rawTempPT100, 16);
    if ((temporaryTempPT100 & 0x8000) > 0) {
        decoded.temperaturePt100 = (temporaryTempPT100 - 0x10000)/100;
    }
    else{
        decoded.temperaturePt100 = temporaryTempPT100 / 100.00;
    }
    
    
    var rawHum = data.substr(14, 4);
    decoded.humidity = parseInt(rawHum, 16) / 100.00;

    return decoded;

}

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';
    }
}

Device Labels

in manual	dataKey	dataType	dataFormat
Battery voltage	batteryVoltage	telemetry	int
Temperature	temperature	telemetry	int
Humidity	humidity	telemetry	int
PT100 Temperature	temperaturePt100	telemetry	int

Remark: 1223 is 12.23 °C, 2345 is 23.45% and so on.

Uplink documentation

sample Uplink message (input to the decoder)

{
    "cmd": "gw",
    "seqno": 634010,
    "EUI": "70B3D5FFFEBF683B",
    "ts": 1661243803551,
    "fcnt": 19692,
    "port": 3,
    "freq": 867500000,
    "toa": 61,
    "dr": "SF7 BW125 4/5",
    "ack": false,
    "gws": [{
        "rssi": -58,
        "snr": 8,
        "ts": 1661243803551,
        "time": "2022-08-23T09:41:10.090091Z",
        "gweui": "000800FFFF4A3A27",
        "ant": 0,
        "lat": 47.4125638,
        "lon": 8.557257400000026
    }],
    "bat": 247,
    "data": "0304000bb30b550e770c45",
    "_id": "6304919ba2a9c65308c4f2e1"
}

sample decoded output

{
    "msg": {
        "temperature": 29.01,
        "temperaturePt100": 31.41,
        "humidity": 37.03,
        "ts": 1660999112051,
        "rssi": -61,
        "dr": "SF7 BW125 4/5",
        "bat": 95.2755905511811,
        "hex": "0304000bb30b550e770c45"
    },
    "metadata": {
        "deviceType": "CM2-100",
        "deviceName": "70B3D5FFFEBF6228",
        "ts": "1660999112076"
    },
    "msgType": "POST_TELEMETRY_REQUEST"
}

Downlink documentation

Downlink PT100

4KB

downlink_pt100.json

var downlinkPayload = "0001f1f10000f1f1";
var result = {
    msg: {
        cmd: "tx",
        EUI: metadata.originatorName,
        port: 101,
        confirmed: false,
        data: downlinkPayload,
        appid: "BE010125"
    },
    msgType: "LORIOT_ALARMDEVICE_DOWNLINK_APICALL",
    metadata: {
    }
}
return result;
//return {msg: msg, metadata: metadata, msgType: msgType};ja

Configuration

• To check the configuration you must connect the device with your computer (via USB).

• Click on the device and open the document

• Now you should see all parameters of the device and the configuration.

• To change the settings, you can edit the parameters, but please only do it if you know, what you're doing.

• When you're finished, save the document, then you can close it and disconnect the device.