Sokol-M1+Modbus
General information
When working with the Sokol-M1 station, data can be retrieved not only via GSM or a direct USB connection, but also by polling using third-party software and various RS-485 converters.
Below are instructions for configuring, connecting, and polling the station using an RS-485 interface converter, as well as for polling via Modbus.
Configuring the station for Modbus operation
To connect the meteo station for Modbus polling via a computer or third-party hardware/software using an RS-485 converter, you must configure the station itself.
Install the Sokol CFG configurator, as well as the system component and library files from Microsoft if necessary. The drivers can be found in the folder containing the Sokol CFG configurator or downloaded from this link. When these files are installed, a message should appear stating, “RuntimePack installed!”
You must also install the drivers to properly connect the station via USB and configure it.
Link to download drivers for the Sokol-M1 station
When you connect the USB cable from the station to the computer, the device should be recognized as "STMicroelectronics Virtual COM Port":
If the port is detected but marked with an exclamation point, either the device is out of power and there isn’t enough power for the COM port to function, or you need to switch USB ports and reconnect it several times. Do not connect the device via a USB hub.
Launch the Sokol Meteo Configurator, select the appropriate COM port, and click “Open Port.” Enter the password by clicking the “Enter Password” button. The default password is 222.
Next, select “Transmission Channel” as MB Only or GSM.
Important! In firmware version 1.3.5 and later, you must check the “Do not sleep” box.
Then click the “Set” button.
By default, the station is set to "1 network address." You can change or check this setting in the configurator under the "Server" tab.
Connecting the station. Power supply. Pinout.
Power supply
To ensure the station operates correctly via Modbus, verify the following connection points:
- Station power supply. Be sure to turn the switch as follows: from the OFF position to ON, then back to OFF, and then to ON again. An external power supply must also be connected to the station
It is not possible to poll the station via Modbus without an external power source. Make sure the station is connected to an external power source.
Power supply pinout 8-25 VDC
| Contact number | Line | Wire color |
| 1 | +12 | brown |
| 2 | GND | blue |
Modbus station connection
Next, you need to connect the station to an RS-485 converter (such as the C200M2 or Bolid) via the station’s Modbus input. You can use any other RS-485 converter, provided you follow the pinout. The pinout for the station’s Modbus cable is as follows.
Modbus connector pinout:
| Contact number | Line | Wire color |
| 1 | A | yellow-green |
| 2 | B | brown |
| 3 | GND | blue |
An alternative pinout is possible:
- Orange - Line A;
- White - Line B;
- White-green - GND (ground)
Pinout and Connection of RS-485 Converters (C200M2)
To ensure the station operates correctly via the C200M2 or Bolid RS-485 converter, you must verify that the wires are connected correctly and that the pinout is correct. You must also install the correct drivers so that the converters are recognized by the computer system.
Drivers for the C200M2 Converter
Once the drivers have been installed correctly, the converter will appear in Device Manager as follows:
Pinout and wire colors for the C200M2 converter:
Pinout and Connection of RS-485 Converters (BOLID)
Bolid C2000-USB - link to download drivers.
Install the necessary drivers, depending on your operating system.
Once the drivers have been installed correctly, the converter will appear in the COM Ports as follows:
Pinout of the BOLID converter:
Example of a Modbus station request
You can poll the station using this command via any program designed for this purpose.
Via the RS-485 interface, using Modbus, you can poll the station with the following parameters/settings:
Protocol - LLS
Data rate - 19200 kbps
Data size - 8 bits
Parity check: None
Stop bits - 1
As an example of a request, we will use the Terminal.exe program
Request command: 01 03 00 00 00 5A C5 F1
01 – address
03 – code of the command
00 00 – the register number starting from which the number of registers is requested
00 5А – number of registers requested (5A – 90 registers)
С5 F1 – CRC-16 Modbus with byte order reversed;
Answer:
01 03 B4 82 80 00 00 00 00 09 A1 27 1D 00 19 00 00 01 01 00 1D 00 00 00 92 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06 01 10 0E 03
01 (address) 03 (command) B4 (number of bytes – 180 or 90 registers)
(Response decoding for stations with firmware versions below 1.4.5)
0. 82 80 – firmware (82-1.3.0) and device type + register bank number + sensor error status (Technical information for device developers)
1. 00 00 - upper 16 bits of UNIX TIME
2. 00 00 - lower 16 bits of UNIX TIME
3. 09 A1 - temperature: unsigned; resolution 0.01 degrees, i.e. 09A1 – 2465 or 24.65°C
4. 27 1D - atmospheric pressure: unsigned; resolution 10 Pa; 271D – 10013, i.e. 100130 Pa
5. 00 19 - relative humidity: unsigned; resolution 1%; 19 – 25%
6. 00 00 - wind speed: unsigned; resolution 0.01 m/s
7. 01 01 - wind direction: unsigned; resolution 1 degree; 101 – 257°
8. 00 1D - precipitation level (built-in sensor on the station): unsigned; resolution 0.01 mm; 0.29
9. 00 00 - ultraviolet radiation level (built-in sensor on the station): unsigned; resolution 0.01 W/m²
10. 00 92 - illuminance level: unsigned; resolution 1 lux; 92 - 146
11. 00 00 - wind speed measured by the ultrasonic anemometer: unsigned; resolution 0.01 m/s
12. 00 00 - wind direction measured by the ultrasonic anemometer: unsigned; resolution 1 degree.
13. 00 00 - distance to the obstacle (snow cover): unsigned; resolution 1 cm. The DGV must have network address 160
14. 00 00 - solar radiation: unsigned; resolution 1 W/m². The pyrheliometer must have network address 181
15. 00 00 - BMVD1
16. 00 00
17. 00 00
18. 00 00
19. 00 00
20. 00 00
21. 00 00
22. 00 00 - BMVD2
23. 00 00
24. 00 00
25. 00 00
26. 00 00
27. 00 00
28. 00 00
29. 00 00 - BMVD3
30. 00 00
31. 00 00
32. 00 00
33. 00 00
34. 00 00
35. 00 00
36. 00 00 - BMVD4
37. 00 00
38. 00 00
39. 00 00
40. 00 00
41. 00 00
42. 00 00
43. 00 00 - BMVD5
44. 00 00
45. 00 00
46. 00 00
47. 00 00
48. 00 00
49. 00 00
50. 00 00 - BMVD6
51. 00 00
52. 00 00
53. 00 00
54. 00 00
55. 00 00
56. 00 00
57. 00 00 - BMVD7
58. 00 00
59. 00 00
60. 00 00
61. 00 00
62. 00 00
63. 00 00
64. 00 00 - BMVD8
65. 00 00
66. 00 00
67. 00 00
68. 00 00
69. 00 00
70. 00 00
71. 00 00 - particulate matter 2.5 μm: unsigned; resolution
72. 00 00 - particulate matter 10 μm: unsigned; resolution
73. 00 00 - CO2 level: unsigned; resolution
74. 00 00 - CO level: unsigned; resolution
75. 00 00 - NO level: unsigned; resolution
76. 00 00 - NO2 level: unsigned; resolution
77. 00 00 - SO2 level: unsigned; resolution
78. 00 00 - H2S level: unsigned; resolution
79. 00 00 - HCN level: unsigned; resolution
80. 00 00 - NH3 level: unsigned; resolution
81. 00 00 - CH2O level: unsigned; resolution
82. 00 00 - weather measurement errors (Weather Errors)
83. 00 00 - reserve 2
84. 00 00 - reserve 3
85. 00 00 - reserve 4
86. 00 00 - reserve 5
87. 00 00 - average wind speed over 10 min
88. 00 06 - wind gust over 10 min
89. 01 10 - events (Technical information for device developers)
0E 03 – CRC-16 modbus
(Response decoding for stations with firmware version 1.4.5 and above)
| Register number | Register description |
|---|---|
| 0 | firmware and device type + register bank number + sensor error status (Technical information for device developers) |
| 1 | upper 16 bits of UNIX TIME |
| 2 | lower 16 bits of UNIX TIME |
| 3 | temperature: signed; resolution 0.01 degrees. The value “2457” equals 24.57 degrees |
| 4 | atmospheric pressure: unsigned; resolution 10 Pa. The value “10074” equals 100740 Pa |
| 5 | relative humidity: unsigned; resolution 1% |
| 6 | wind speed: unsigned; resolution 0.01 m/s. The value “256” equals 2.56 m/s |
| 7 | wind direction: unsigned; resolution 1 degree |
| 8 | Precipitation level: unsigned; resolution 0.1 mm. The value “29” equals 2.9 mm |
| 9 | Ultraviolet radiation level (built-in sensor on the station): unsigned; resolution 0.01 W/m2. The value “456” equals 4.56 W/m2 |
| 10 | Illuminance level: unsigned; resolution 1 lux |
| 11 | Wind speed measured by the ultrasonic anemometer: unsigned; resolution 0.01 m/s. The value “256” equals 2.56 m/s |
| 12 | Wind direction measured by the ultrasonic anemometer: unsigned; resolution 1 degree |
| 13 | Distance to the obstacle (snow cover): unsigned; resolution 1 cm. The DGV must have network address 160 |
| 14 | Solar radiation: unsigned; resolution 1 W/m2. The pyrheliometer must have network address 181 |
| 15 + 7*N[0:7] | BMVD-N, signed value of sensor 1 |
| 15 + 7*N[0:7] + 1 | BMVD-N, signed value of sensor 2 |
| 15 + 7*N[0:7] + 2 | BMVD-N, signed value of sensor 3 |
| 15 + 7*N[0:7] + 3 | BMVD-N, signed value of sensor 4 |
| 15 + 7*N[0:7] + 4 | BMVD-N, signed value of sensor 5 |
| 15 + 7*N[0:7] + 5 | BMVD-N, signed value of sensor 6 |
| 15 + 7*N[0:7] + 6 | BMVD-N, signed value of sensor 7 |
| 71 | Particulate matter 2.5 μm: unsigned; resolution |
| 72 | Particulate matter 10 μm: unsigned; resolution |
| 73 | CO2 level: unsigned; resolution |
| 74 | CO level: unsigned; resolution |
| 75 | NO level: unsigned; resolution |
| 76 | NO2 level: unsigned; resolution |
| 77 | SO2 level: unsigned; resolution |
| 78 | H2S level: unsigned; resolution |
| 79 | HCN level: unsigned; resolution |
| 80 | NH3 level: unsigned; resolution |
| 81 | CH2O level: unsigned; resolution |
| 82 | weatherErrors |
| 83 | Sokol-DS register 1 |
| 84 | Sokol-DS register 2 |
| 85 | (Microwave sensor water flow speed in mm/s) waterflow speed in mm/s (PWFL432-P) |
| 86 | (Microwave sensor distance in centimeters) distance in cm (PWRD81HB or PWFL432-P) |
| 87 | average wind speed over 10 min |
| 88 | wind gust over 10 min |
| 89 | events (Technical information for device developers) |
| 90 + N[0:7] | BMVD-N, signed value of sensor 8 |
| 98 | Humidity from the DVP sensor when directly connected, in % (address 170) |
| 99 | Temperature from the DVP sensor in Celsius when directly connected (address 170) |
| 100 | PPFD (Sensor for measuring Photosynthetic Photon Flux Density.) Sokol-FAR (address 184) |
If you specify a different register in the command as the starting point for the data to be unloaded, and specify a different number of registers to be requested, the response will contain fewer registers.
Example:
Request the 10 registers following the 5th
Request:
01 03 00 05 00 0A D5 CC
01 – address
03 – command
00 05 – Request to return registers starting from the 5th; that is, the response will include registers starting from the 6th
00 0А – Request to return 10 registers
D5 CC – checksum (byte order reversed)
Answer:
01 03 14 00 19 00 00 01 01 00 00 00 00 00 8D 00 00 00 00 00 00 00 00 81 FF
01 - address
03 - command
14 - number of bytes – 20, i.e., 10 registers
00 19 - humidity
00 00 - wind speed
01 01 - wind direction
00 00 - Precipitation level (unsigned); resolution 0.1 mm; 2.9
00 00 - Ultraviolet radiation level (unsigned); resolution 0.01 W/m²
00 8D - Illuminance level: unsigned; resolution: 1 lux; 92–146
00 00 - Wind speed measured by the UZ anemometer is unsigned; resolution 0.01 m/s
00 00 - The wind direction reading from the UZ anemometer is unsigned; resolution: 1 degree.
00 00 - The distance to the obstacle (snow cover) is unsigned; resolution is 1 cm. The DGV must have the network address 160
00 00 - Solar radiation: unsigned; resolution 1 W/m². The pyrheliometer must have the IP address 181
81 FF – checksum
Useful links
Analysis of a Modbus station request string (RUS)