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Lobaro Pressure or Lobaro Pressure and
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Temperature Sensor
Lobaro Platform Device Type: Status colour Blue title lobaro-pegelsonde-hybrid
Select the correct sensor by checking the cable flag. The Pressure and Temperature sensor got a "P+T" marking.
Lobaro Pressure and Temperature Sensor | Lobaro Pressure Sensor |
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Lobaro Pressure and Temperature Sensor
To read out the pressure & temperature probe, the Hybrid Modbus Gateway must be configured as follows:
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KELLER Series 26X | ||||||
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Lobaro article: #3000625 | Lobaro article: | Lobaro article: #3000701 | ||||
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Red = VCC, Green = GND, RS485A = Yellow, RS485B = Blue | ||||||
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Lobaro Pressure and Temperature Sensor
To read out the pressure & temperature probe, the Hybrid Modbus Gateway must be configured as follows:
Parameter | Value | Comment |
---|---|---|
WAN | lorawan | For LoRaWAN OTAA usage. |
PlFmt | 5 | Sets the payload to a short format. |
MbCmd | 0 0/15 * * * *:R,9600,8N1:010300160002,010300260002,fa0400050001 |
The CRON Expressions can be adjusted to set time of sensor reading. |
PowerOnDelay | 3000 | Battery variant only. Sets time (in ms) between activating sensor power and reading value (time for sensor to be ready). |
Command (since FW v0.10.2)
Starting from v0.10.2 we support a command for LoRaWAN only!
Parameter | Value | Comment |
---|---|---|
Cmd | 0 * * * * *:pressure(port=20) | Special command to upload in same format but calculating a more stable pressure value |
Modbus Register Mapping
The probe is a Modbus slave with the following registers:
Modbus Command: <Slave Address (1)><Function (1)><Address (2)><Length (2)>
- Length = Register count -> 1 Register = 2 Bytes
Function
- 0x03 = Read Holding Register
- 0x04 = Read Input Register
- 0x06 = Write Holding Register
Address | Function | Bytes | Data Scope | Description |
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0x0000 | 0x03, 0x06 | 2 | 1-255 | Slave Address |
0x0001 | 0x03, 0x06 | 2 |
| Baud rate |
0x0002 | 0x03, 0x06 | 2 |
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0x0003 | 0x03 | 2 |
| Pressure unit |
0x0004 | 0x03 | 2 |
| Decimal point stands for 0-4 digits |
0x0005 | 0x03 | 2 | 0-30 | Filtering Coefficient |
0x0016-0017 | 0x03 | 4 | 4 byte float | Measurement Pressure output value |
0x0018-0019 | 0x03, 0x06 | 4 | 4 byte float | Master variable of Pressure offset |
0x001A-001B | 0x03 | 4 | 4 byte float | Range minimum of Pressure Transmitter |
0x001C-001D | 0x03 | 4 | 4 byte float | Range maximum of Pressure Transmitter |
0x001E-001F | 0x03 | 4 | 4 byte float | Range minimum of Pressure Sensor |
0x0020-0021 | 0x03 | 4 | 4 byte float | Range maximum of Pressure Sensor |
0x0026-0027 | 0x03 | 4 | 4 byte float | Measurement Temperature output value |
0x00A6-00A7 | 0x06 | 4 | 4 byte float | Zero Clearing value of Pressure Transmitter |
0xFFFF | 0x06 | 2 |
| Save data to user area |
0xFFFC | 0x06 | 2 |
| Restore to factory status (user settings and calibration data) |
Data Uplink (Port 20)
Code Block |
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Bytes | 0 . | 1 . 2 . 3 . 4 . | 5 . 6 . 7 . 8 . | 9 . 10 . |
------+--------+-----------------+-----------------+----------+
Field | Header | Pressure | Temperature | Voltage | |
All values are encoded big-endian
Field | Type | Value |
---|---|---|
Header | uint8 | 0x00 on success, 0x80 if an error occurred |
Pressure | float32 | Pressure in mH2O , ffffffff on error. |
Temperature | float32 | Temperature in |
Voltage | uint16 | Voltage in mV, ffff on error |
010300160002
Example
Code Block |
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# Example of a successful measurement
'003d94ce4541b7a5120e2a'
'00' -> Successful readout
'3d94ce45' -> 0.073 mH2O
'41b7a512' -> 22.96 °C
'0e2a' -> 3626 mV / 3.626 V
# Example
'80ffffffffffffffff'
'80' -> An error occurred.
'ffffffff' -> Pressure could not be read.
'ffffffff' -> Temperature could not be read.
'ffff' -> Voltage could not be read. |
Reference Parser
see below
Lobaro Pressure Sensor
Reading from the Lobaro Pressure Sensor using the Hybrid Gateway can be done by setting the following parameters in the configuration:
Parameter | Value | Comment |
---|---|---|
WAN | lorawan | For LoRaWAN OTAA usage. |
PlFmt | 5 | Sets the payload to a short format. |
MbCmd | 0 0/15 * * * *:R,9600,8N1:010300040001,fa0400040001,fa0400050001 |
The CRON Expressions can be adjusted to set time of sensor reading. |
PowerOnDelay | 3000 | Battery variant only. Sets time (in ms) between activating sensor power and reading value (time for sensor to be ready). |
Modbus Register Mapping
The probe is a Modbus slave with the following registers:
Modbus Command: <Slave Address (1)><Function (1)><Address (2)><Length (2)>
- Length = Register count -> 1 Register = 2 Bytes
Function
- 0x03 = Read Holding Register
- 0x06 = Write Holding Register
Address | Function | Bytes | Data Scope | Description |
---|---|---|---|---|
0x0000 | 0x03, 0x06 | 2 | 1-255 | Slave Address |
0x0001 | 0x03, 0x06 | 2 |
| Baud rate |
0x0003 | 0x03 | 2 |
| Decimal point stands for 0-3 digits |
0x0002 | 0x03 | 2 |
| Pressure unit |
0x0004 | 0x03 | 2 | -32768-32767 | Measurement output value |
0x0005 | 0x03 | 2 | -32768-32767 | Zero point of transmitter range |
0x0006 | 0x03 | 2 | -32768-32767 | Full point of transmitter range |
0x000c | 0x03, 0x06 | 2 | -32768-32767 | Zero point offset value, generally factory sets as 0 |
0x000F | 0x06 | 2 |
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0x0010 | 0x06 | 2 |
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Data Uplink LoRaWAN (Port 20)
Code Block |
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Bytes | 0 . | 1 . 2 . | 3 . 4 . | 5 . 6 . |
------+--------+----------+-------------+---------|
Field | Header | Pressure | Temperature | Voltage | |
All values are encoded big-endian
Field | Type | Value |
---|---|---|
Header | uint8 | 0x00 on success, 0x80 if an error occurred |
Pressure | int16BE | Pressure in mmH2O |
Temperature | int16BE | Temperature in °C inside Bridge |
Voltage | uint16BE | Voltage in mV, ffff on error |
Example
Code Block |
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# Example of a successful measurement
'000211001a0e2a'
'00' -> Successful readout
'0211' -> 529 -> 0.529 mH2O
'001a' -> 26 -> 26°C (inside Box)
'0e2a' -> 3626 -> 3626 mV / 3.626 V |
Keller PR26X
Configuration
Connected pressure sensor probe from Keller Druckmesstechnik PR26X series.
Parameter | Value | Comment |
---|---|---|
WAN | lorawan | For LoRaWAN OTAA usage. |
PlFmt | 5 | Sets the payload to a short format. |
MbCmd | 0 0 * * * *:R,9600,8N1:010300020002,010300080002,FA0400050001 | Reads four Registers: 2 + 3 (Float, Pressure in Bar) and 8 + 9 (Float, Probe Temperature) + Device battery voltage |
PowerOnDelay | 1500 | Battery variant only. Sets time (in ms) between activating sensor power and reading value (time for sensor to be ready). |
Example Modbus response
Hex to float converter: https://gregstoll.com/~gregstoll/floattohex/
Pressure (0x3f75f07b):
Temperature (0x41b5c079):
Data Uplink (Port 20)
Code Block |
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Bytes | 0 . | 1 . 2 . 3 . 4 . | 5 . 6 . 7 . 8 . | 9 . 10 . |
------+--------+-----------------+-----------------+----------+
Field | Header | Pressure | Temperature | Voltage | |
All values are encoded big-endian
Field | Type | Value |
---|---|---|
Header | uint8 | 0x00 on success, 0x80 if an error occurred |
Pressure | float32 | Pressure in Bar , ffffffff on error. |
Temperature | float32 | Temperature in |
Voltage | uint16 | Voltage in mV, ffff on error |
Keller PR46X
Configuration
Connected pressure sensor probe from Keller Druckmesstechnik PR46X series.
Parameter | Value | Comment |
---|---|---|
WAN | lorawan | For LoRaWAN OTAA usage. |
PlFmt | 5 | Sets the payload to a short format. |
MbCmd | 0 0 * * * *:R,9600,8N1:010300020002,010300060002,FA0400050001 | Reads four Registers: 2 + 3 (Float, Pressure in Bar) and 6 + 7 (Float, Probe Temperature) + Device battery voltage |
PowerOnDelay | 1500 | Battery variant only. Sets time (in ms) between activating sensor power and reading value (time for sensor to be ready). |
Data Uplink (Port 20)
Code Block |
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Bytes | 0 . | 1 . 2 . 3 . 4 . | 5 . 6 . 7 . 8 . | 9 . 10 . |
------+--------+-----------------+-----------------+----------+
Field | Header | Pressure | Temperature | Voltage | |
All values are encoded big-endian
Field | Type | Value |
---|---|---|
Header | uint8 | 0x00 on success, 0x80 if an error occurred |
Pressure | float32 | Pressure in Bar , ffffffff on error. |
Temperature | float32 | Temperature in |
Voltage | uint16 | Voltage in mV, ffff on error |
LoRaWAN JavaScript Reference Parser (All probe variants)
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/**
* Parser for Lobaro Pressure Probe via LoRaWAN (hybrid gateway).
* Usable for Pressure Probe as or with Presure+Temperature Probe.
* Works with TTN, ChirpStack, or the Lobaro Platform.
*/
function signed(val, bits) {
// max positive value possible for signed int with bits:
var mx = Math.pow(2, bits-1);
if (val < mx) {
// is positive value, just return
return val;
} else {
// is negative value, convert to neg:
return val - (2 * mx);
}
}
// Note that MAX_SAFE_INTEGER is 9007199254740991
function toNumber_BE(bytes, len, signed) {
var res = 0;
var isNeg = false;
if (len == 0) {
len = bytes.length;
}
if (signed) {
isNeg = (bytes[0] & 0x80) != 0;
}
for (var i = 0; i < len ; i++) {
if (i == 0 && isNeg) {
// Treat most-significant bit as -2^i instead of 2^i
res += bytes[i] & 0x7F;
res -= 0x80;
} else {
res *= 256;
res += bytes[i];
}
}
return res;
}
function int16_BE(bytes, idx) {
bytes = bytes.slice(idx || 0);
return signed(bytes[0] << 8 | bytes[1] << 0, 2*8);
}
function int32_BE(bytes, idx) {
bytes = bytes.slice(idx || 0);
return toNumber_BE(bytes, 4, true);
}
function uint16_BE(bytes, idx) {
bytes = bytes.slice(idx || 0);
return bytes[0] << 8 | bytes[1] << 0;
}
function uint32_BE(bytes, idx) {
bytes = bytes.slice(idx || 0);
return bytes[0] << 24 | bytes[1] << 16 | bytes[2] << 8 | bytes[3] << 0;
}
// float32([62, 132, 168, 155]) = 0.305068
function float32(bytes, idx) {
bytes = bytes.slice(idx || 0);
bytes = int32_BE(bytes, 0)
var sign = (bytes >> 31) == 0 ? 1 : -1; // Comparison with 0x80000000 fails on 32 bit systems!
var exponent = ((bytes >> 23) & 0xFF) - 127;
var significand = (bytes & ~(-1 << 23));
if (exponent == 128) {
// Some systems might have issues with NaN and POSITIVE_INFINITY, e.g. JSON parsing in GoLang
// return sign * ((significand) ? Number.NaN : Number.POSITIVE_INFINITY);
return null;
}
if (exponent == -127) {
if (significand == 0) return sign * 0.0;
exponent = -126;
significand /= (1 << 22);
} else {
significand = (significand | (1 << 23)) / (1 << 23);
}
return sign * significand * Math.pow(2, exponent);
}
function float32_BE(bytes, idx) { return float32(bytes, idx); }
/**
* TTN decoder function.
*/
function Decoder(bytes, port) {
var vals = {};
if( port == 20 ){
if (bytes.length==5) {
// Pressure Probe without temperature sensor and Bridges internal Temperature
vals["error"] = !!(bytes[0]&0x80);
vals["pressure"] = int16_BE(bytes, 1)/1000;
vals["temperature"] = int16_BE(bytes, 3);
} else if (bytes.length==7) {
vals["error"] = !!(bytes[0]&0x80);
vals["pressure"] = int16_BE(bytes, 1)/1000;
vals["temperature"] = int16_BE(bytes, 3);
vals["voltage"] = uint16_BE(bytes, 5) / 1000;
} else if (bytes.length==9) {
vals["error"] = !!(bytes[0]&0x80);
// pressure in mH2O
vals["pressure"] = float32_BE(bytes, 1);
// temperature in Degree Celsius
vals["temperature"] = float32_BE(bytes, 5);
} else if (bytes.length==11) {
vals["error"] = !!(bytes[0]&0x80);
// pressure in mH2O or Bar, depending on probe type
vals["pressure"] = float32_BE(bytes, 1);
// temperature in Degree Celsius
vals["temperature"] = float32_BE(bytes, 5);
vals["voltage"] = uint16_BE(bytes, 9) / 1000;
}
}
if (port === 64 && bytes.length == 13) { // status packet
vals["Firmware Identifier"] = String.fromCharCode(bytes[0]) + String.fromCharCode(bytes[1]) + String.fromCharCode(bytes[2]);
vals["FirmwareVersion"] = bytes[3] + '.' + bytes[4] + '.' + bytes[5];
vals["status"] = bytes[6];
vals["reboot reason"] = bytes[7];
vals["final words"] = bytes[8];
vals["voltage"] = uint16_BE(bytes,9)/1000.0
vals["temperature"] = int16_BE(bytes,11)/10.0;
}
return vals;
}
function NB_ParseModbusQuery(input){
vals = {};
for( var i = 0; i< input.d.batch.length; i++ ){
if (input.d.batch[i].cmd == "AQMAFgAC"){
vals["pressure"] = float32_BE(bytes(atob(input.d.batch[i].rsp)),3);
}
if (input.d.batch[i].cmd == "AQMAJgAC"){
vals["temperature"] = float32_BE(bytes(atob(input.d.batch[i].rsp)),3);
}
// else: keller
if (input.d.batch[i].cmd == "AQMAAgAC"){
// convert to mH2O
vals["pressure"] = float32_BE(bytes(atob(input.d.batch[i].rsp)),3)*10.197442889221;
}
if (input.d.batch[i].cmd == "AQMACAAC"){
vals["temperature"] = float32_BE(bytes(atob(input.d.batch[i].rsp)),3);
}
// vbat
if (input.d.batch[i].cmd == "+gQABQAB"){
vals["vBat"] = int16_BE(bytes(atob(input.d.batch[i].rsp)),3)/1000.0;
}
// internal temperature
if (input.d.batch[i].cmd == "+gQABAAB"){
vals["temperatureInt"] = int16_BE(bytes(atob(input.d.batch[i].rsp)),3);
}
}
return vals;
}
/**
* TTN V3 Wrapper
*/
function decodeUplink(input) {
return {
data: {
values: Decoder(input.bytes, input.fPort)
},
warnings: [],
errors: []
};
}
function NB_ParseDeviceQuery(input) {
for (var key in input.d) {
var v = input.d[key];
switch (key) {
case "temperature":
v = v / 10.0;
Device.setProperty("device.temperature", v); |
Data Uplink (Port 20)
Bytes | 0 . | 1 . 2 . 3 . 4 . | 5 . 6 . 7 . 8 . | 9 . 10 . |
------+--------+-----------------+-----------------+----------+
Field | Header | Pressure | Temperature | Voltage |
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Temperature in °C
, ffffffff
on error.
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Example
Code Block |
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# Example of a successful measurement
'003d94ce4541b7a5120e2a'
'00' -> Successful readout
'3d94ce45' -> 0.073 mH2O
'41b7a512' -> 22.96 °C
'0e2a' -> 3626 mV / 3.626 V
# Example
'80ffffffffffffffff'
'80' -> An error occurred.
'ffffffff' -> Pressure could not be read.
'ffffffff' -> Temperature could not be read.
'ffff' -> Voltage could not be read. |
Reference Parser
see below
Lobaro Pressure Sensor
Reading from the Lobaro Pressure Sensor using the Hybrid Gateway can be done by setting the following parameters in the configuration:
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Data Uplink (Port 20)
Bytes | 0 . | 1 . 2 . | 3 . 4 . | 5 . 6 . |
------+--------+----------+-------------+---------|
Field | Header | Pressure | Temperature | Voltage |
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Pressure in mmH2O
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Example
Code Block |
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# Example of a successful measurement
'000211001a0e2a'
'00' -> Successful readout
'0211' -> 529 -> 0.529 mH2O
'001a' -> 26 -> 26°C (inside Box)
'0e2a' -> 3626 -> 3626 mV / 3.626 V |
Reference Parser (Both variants)
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language | js |
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title | Pressure Probe Parser |
linenumbers | true |
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continue; |
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case |
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" |
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vbat": |
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v = |
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v / 1000.0; Device.setProperty("device.voltage", v); |
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continue; } |
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Device.setProperty("device." + key, v); |
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} |
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return null; } function NB_ParseConfigQuery(input) { for (var key in input.d) { Device.setConfig(key, input.d[key]); } return null; } function |
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NB_ParseStatusQuery(input) { NB_ParseDeviceQuery(input); return null; } /** * |
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ChirpStack decoder function. */ function Decode(fPort, bytes) { // wrap TTN Decoder: |
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return Decoder(bytes, |
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fPort); } /** * Lobaro Platform decoder function. |
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*/ |
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function Parse(input) { if (input.i && input.d) { |
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// NB-IoT var decoded = {}; |
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decoded = input.d; |
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decoded.address = |
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input.i; decoded.fCnt = input.n; |
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var query = |
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input.q || "data"; |
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switch |
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(query) |
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{ case |
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config": |
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return NB_ParseConfigQuery(input); |
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case "device": |
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return NB_ParseDeviceQuery(input); |
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case |
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"modbus": |
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return NB_ParseModbusQuery(input); |
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case |
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"status": |
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return NB_ParseStatusQuery(input); |
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default: |
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} |
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return |
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decoded; } |
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var data = bytes(atob(input.data));
var port = input.fPort;
return Decoder(data, port);
} |
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