4-20mA to wireless HART output

The conversion of 4-20mA signals to wireless HART output can be achieved by designing a conversion module. This module needs to be able to read 4-20mA signals and convert them into a HART protocol data format for transmission. An analog signal converter and a wireless HART modem are usually required. If you have relevant experience in electronic design and programming, or if you can purchase ready-made converters available on the market to achieve this function. .

I want to design such a module now; theoretically, it’s feasible, right?

Yes, it is theoretically feasible. You need to design a circuit that can read 4-20mA analog signals, process them using a microcontroller to convert them into digital signals in HART format, and then transmit those signals via a wireless module. This process involves technologies such as analog signal acquisition, digital signal processing, and wireless signal communication. .

This post was last edited by qugd on 2024-2-29 at 18:10. The feasibility is low. If the instrument itself does not support the HART protocol, then many of its parameters lack data sources that can be accessed and supported by the HART protocol. Adding a card or accessory with HART protocol conversion functionality can only convert 4 – 20mA signals into a format compatible with HART protocol transmission; however, it does not enable the retrieval, transmission, or writing of information specific to the HART protocol, as the instrument itself may not possess such sources of information beyond the measurement values. In other words, for a gauge that does not support the HART protocol, there may be no parameters or corresponding setting functions within it other than those related to the values it measures; without the core element, the accompanying elements cannot exist.

I only need the data measured by the instrument itself; I convert the 4-20ma signal output into a digital signal before processing it

As long as measurements are available, there is no need to add a conversion card to a meter. Unless most of the other instruments on site have wireless HART functionality.

Are you planning to develop and use this board primarily, or do you just want to convert analog signals into digital ones for transmission to another location?

To convert field instruments into wireless Hart signals for transmission to a wireless Hart gateway

This post was last edited by qugd on 2024-3-8 at 16:13. China has long had such field wireless conversion cards that use the HART protocol for communication; such products have been available in China for at least 15 years now.