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Industrial Unibody Temperature Transmitter, High Accuracy, Stainless Steel Probe, Water-Proof & Dust-Proof, RS485 Bus
Hesman interface | |
1 | V+(12V~36V) |
2 | A |
3 | V-(GND) |
4() | B |
Modbus protocol is a universal language used in industrial electronic controllers. Modbus supports communication to and from multiple devices connected to the same cable or Ethernet network, it has become a standard communication protocol. With the Modbus, control equipment produced by different manufactures can be connected to the sam industrial network for centralized monitoring. The protocol defines a message structure, which can be recognized and used by the controller through any network. It describes the process of a controller requesting access to other devices, how to respond to requests from other devices, and how to detect and record errors. It has formulated a common format for the structure and content of the message domain.
Advantage of Modbus: (1)It is a standard protocol, open-sources, and free to use. (2)Modbus protocol support RS-232, RS-485 bus, and so on. (3)The format of Modbus is simple and easy to use.
This sensor is compatible with Modbus RTU. The RS485 port is half-duplex.
a) Output signal: RS485 (Communication distance is up to 1000m. Support multi-connect 32 devices)
b) Standard Modbus-RTU protocol (03: Read data; 06: Write setting data)<br /? c) Data format: 9600, N, 8, 1
d) Measure range: 0-X(MPa, kPa...)
e) Accuracy: 0.05%
f) Output data: 0...2000(range is customizable)
g) Response frequency: ≤5Hz
h) Response speed: ≥10ms
The device address of 0-1.6Mpa sensor is 0x01, that is [Address]=01 (The Address range 01-254)
CRC0=84 and CRC1=0a, then the commands will be:
Command: 01 03 00 00 00 01 84 0A
Response: 01 03 02 02 AC B9 59
Convert 02AC to DEC, you will get the data 684;
Because the data range is 0-2000, related to the pressure range 0-1.6Mpa, the pressure read is P = 1.6*684/2000=0.5472MPa
The formula: (The maximum range - the minimum range) /2000 * Current data + minumin ranage = current pressure.
Command: FF 03 00 0F 00 01 A1 D7
Response: FF 03 02 00 01 50 50
That is: The device address is 01
Command: 01 06 00 0F 00 09 79 CF
Response: 01 06 00 0F 00 09 79 CD
The modification will be valid without a restart.
Pull out the terminal block which is inside the casing of the plug to connect the wire, wiring steps areas shown in the following figure.