[SM7594B]  Ceiling temperature and humidity sensor

SM7594B SM7594B

Technical Parameters

Technical parameterParameter value
BrandSONBEST
Temperature measuring range-30℃~80℃
Temperature measuring accuracy±0.5℃ @25℃
Humidity measuring range0~100%RH
Humidity accuracy±3%RH @25℃
InterfaceRS485/4-20mA/DC0-5V/DC0-10V
PowerDC12~24V 1A
Running temperature-30~85℃
Working humidity5%RH~90%RH

Product Selection

    Product DesignRS485,4-20mA,DC0-5V,DC0-10VMultiple output methods, the products are divided into the following models depending on the output method.
Product model output method
SM7594BRS485总线
SM7594M4-20mA
SM7594V5DC0-5V
SM7594V10DC0-10V

Product Size

SM7594B

Why choose this product?

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How to use?

SM7594B

Application solution

SM7594B

Pictures

SM7594B SM7594B

Communication Protocol

    The product uses RS485 MODBUS-RTU standard protocol format, all operation or reply commands are hexadecimal data. The default device address is 1 when the device leaves the factory, and the module or NON-Recorder default baud rate is 9600,8,n,1 ,but data recorder default baud rate is 115200 .
1. Read data (function code 0x03)
    Inquiry frame (hexadecimal), sending example: query 1 data of 1# device, the upper computer sends the command: 01 03 00 00 00 02 C4 0B .
Address Function Code Start Address Data Length Check Code
010300 0000 02C4 0B
    For the correct query frame, the device will respond with data: 01 03 04 00 7A 00 00 DB EA , response format:
Address Function Code LengthData 1Data 2Check Code
0103 0400 7900 7A DB EA
    Data description: The data in the command is hexadecimal, take data 1 as an example, 00 79 is converted to decimal value as 121, assuming the data magnification is 100, then the real value is 121/100=1.21, Others and so on.
2. Common data address table
Configuration Address Register Address Register Description Data Type Value Range
4000100 00temperatureRead Only0~65535
4000200 01humidityRead Only0~65535
4010100 64Model CodeRead/Write0~65535
4010200 65 total number of measuring points read/write 1~20
4010300 66device addressread/write1~249
4010400 67baud rateread/write0~6
4010500 68communication moderead/write1~4
4010600 69protocol typeread/write1~10

1. temperature and current computing relationship

  For example, the range is -30~80℃, the analog output is 4~20mA current signal, temperature and current The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is temperature range upper limit, A1 is the lower limit of the range, B2 is current output range upper limit, B1 is the lower limit, X is the currently read temperature value, and C is the calculated current value. The list of commonly used values is as follows:
current(mA)temperatureValue (℃) Calculation Process
4-30(80-(-30))*(4-4)÷(20-4)+-30
5-23.125(80-(-30))*(5-4)÷(20-4)+-30
6-16.25(80-(-30))*(6-4)÷(20-4)+-30
7-9.375(80-(-30))*(7-4)÷(20-4)+-30
8-2.5(80-(-30))*(8-4)÷(20-4)+-30
94.375(80-(-30))*(9-4)÷(20-4)+-30
1011.25(80-(-30))*(10-4)÷(20-4)+-30
1118.125(80-(-30))*(11-4)÷(20-4)+-30
1225(80-(-30))*(12-4)÷(20-4)+-30
1331.875(80-(-30))*(13-4)÷(20-4)+-30
1438.75(80-(-30))*(14-4)÷(20-4)+-30
1545.625(80-(-30))*(15-4)÷(20-4)+-30
1652.5(80-(-30))*(16-4)÷(20-4)+-30
1759.375(80-(-30))*(17-4)÷(20-4)+-30
1866.25(80-(-30))*(18-4)÷(20-4)+-30
1973.125(80-(-30))*(19-4)÷(20-4)+-30
2080(80-(-30))*(20-4)÷(20-4)+-30
    As shown in the above formula, when measuring 8mA, current current is 31.5℃。

2. humidity and current computing relationship

  For example, the range is 0~100%RH, the analog output is 4~20mA current signal, humidity and current The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is humidity range upper limit, A1 is the lower limit of the range, B2 is current output range upper limit, B1 is the lower limit, X is the currently read humidity value, and C is the calculated current value. The list of commonly used values is as follows:
current(mA)humidityValue (%RH) Calculation Process
40.0(100-0)*(4-4)÷(20-4)+0
56.3(100-0)*(5-4)÷(20-4)+0
612.5(100-0)*(6-4)÷(20-4)+0
718.8(100-0)*(7-4)÷(20-4)+0
825.0(100-0)*(8-4)÷(20-4)+0
931.3(100-0)*(9-4)÷(20-4)+0
1037.5(100-0)*(10-4)÷(20-4)+0
1143.8(100-0)*(11-4)÷(20-4)+0
1250.0(100-0)*(12-4)÷(20-4)+0
1356.3(100-0)*(13-4)÷(20-4)+0
1462.5(100-0)*(14-4)÷(20-4)+0
1568.8(100-0)*(15-4)÷(20-4)+0
1675.0(100-0)*(16-4)÷(20-4)+0
1781.3(100-0)*(17-4)÷(20-4)+0
1887.5(100-0)*(18-4)÷(20-4)+0
1993.8(100-0)*(19-4)÷(20-4)+0
20100.0(100-0)*(20-4)÷(20-4)+0
    As shown in the above formula, when measuring 8mA, current current is 29%RH。

1. temperature and DC0-5Vvoltage computing relationship

  For example, the range is -30~80℃, the analog output is 0~5V DC0-5Vvoltage signal, temperature and DC0-5Vvoltage The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is temperature range upper limit, A1 is the lower limit of the range, B2 is DC0-5Vvoltage output range upper limit, B1 is the lower limit, X is the currently read temperature value, and C is the calculated DC0-5Vvoltage value. The list of commonly used values is as follows:
DC0-5Vvoltage(V)temperatureValue (℃) Calculation Process
0-30(80-(-30))*(0-0)÷(5-0)+-30
1-8(80-(-30))*(1-0)÷(5-0)+-30
214(80-(-30))*(2-0)÷(5-0)+-30
336(80-(-30))*(3-0)÷(5-0)+-30
458(80-(-30))*(4-0)÷(5-0)+-30
580(80-(-30))*(5-0)÷(5-0)+-30
    As shown in the above formula, when measuring 2.5V, current DC0-5Vvoltage is 55℃。

2. humidity and DC0-5Vvoltage computing relationship

  For example, the range is 0~100%RH, the analog output is 0~5V DC0-5Vvoltage signal, humidity and DC0-5Vvoltage The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is humidity range upper limit, A1 is the lower limit of the range, B2 is DC0-5Vvoltage output range upper limit, B1 is the lower limit, X is the currently read humidity value, and C is the calculated DC0-5Vvoltage value. The list of commonly used values is as follows:
DC0-5Vvoltage(V)humidityValue (%RH) Calculation Process
00.0(100-0)*(0-0)÷(5-0)+0
120.0(100-0)*(1-0)÷(5-0)+0
240.0(100-0)*(2-0)÷(5-0)+0
360.0(100-0)*(3-0)÷(5-0)+0
480.0(100-0)*(4-0)÷(5-0)+0
5100.0(100-0)*(5-0)÷(5-0)+0
    As shown in the above formula, when measuring 2.5V, current DC0-5Vvoltage is 50%RH。

1. temperature and DC0-10Vvoltage computing relationship

  For example, the range is -30~80℃, the analog output is 0~10V DC0-10Vvoltage signal, temperature and DC0-10Vvoltage The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is temperature range upper limit, A1 is the lower limit of the range, B2 is DC0-10Vvoltage output range upper limit, B1 is the lower limit, X is the currently read temperature value, and C is the calculated DC0-10Vvoltage value. The list of commonly used values is as follows:
DC0-10Vvoltage(V)temperatureValue (℃) Calculation Process
0-30(80-(-30))*(0-0)÷(10-0)+-30
1-19(80-(-30))*(1-0)÷(10-0)+-30
2-8(80-(-30))*(2-0)÷(10-0)+-30
33(80-(-30))*(3-0)÷(10-0)+-30
414(80-(-30))*(4-0)÷(10-0)+-30
525(80-(-30))*(5-0)÷(10-0)+-30
636(80-(-30))*(6-0)÷(10-0)+-30
747(80-(-30))*(7-0)÷(10-0)+-30
858(80-(-30))*(8-0)÷(10-0)+-30
969(80-(-30))*(9-0)÷(10-0)+-30
1080(80-(-30))*(10-0)÷(10-0)+-30
    As shown in the above formula, when measuring 5V, current DC0-10Vvoltage is 55℃。

2. humidity and DC0-10Vvoltage computing relationship

  For example, the range is 0~100%RH, the analog output is 0~10V DC0-10Vvoltage signal, humidity and DC0-10Vvoltage The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is humidity range upper limit, A1 is the lower limit of the range, B2 is DC0-10Vvoltage output range upper limit, B1 is the lower limit, X is the currently read humidity value, and C is the calculated DC0-10Vvoltage value. The list of commonly used values is as follows:
DC0-10Vvoltage(V)humidityValue (%RH) Calculation Process
00.0(100-0)*(0-0)÷(10-0)+0
110.0(100-0)*(1-0)÷(10-0)+0
220.0(100-0)*(2-0)÷(10-0)+0
330.0(100-0)*(3-0)÷(10-0)+0
440.0(100-0)*(4-0)÷(10-0)+0
550.0(100-0)*(5-0)÷(10-0)+0
660.0(100-0)*(6-0)÷(10-0)+0
770.0(100-0)*(7-0)÷(10-0)+0
880.0(100-0)*(8-0)÷(10-0)+0
990.0(100-0)*(9-0)÷(10-0)+0
10100.0(100-0)*(10-0)÷(10-0)+0
    As shown in the above formula, when measuring 5V, current DC0-10Vvoltage is 50%RH。

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