Newsletter, February 2020
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ProComSol, Ltd is a leader in the design and manufacture of advanced, cost-effective, and reliable HART communication products for the Process Control marketplace. We are dedicated to providing the best HART products on the market, helping our customers to connect, configure, and document their essential operations. |
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HART Loop Resistor : WHY? A NEW Whitepaper You just received one of the new technology HART communicators that use your smart phone. You connect the modem to your HART instrument, launch the App and… nothing happens - “Error connecting to device”. What is going on?!
Your loop is missing a vital element of HART - the Loop Resistor. Per the HART specification HCF_SPEC-054, FSK Physical Layer Specification, the resistor is essential to HART communications. It is needed to convert the current based HART signal to a voltage signal. Read the entire paper HERE. |
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 | HART is always going to need a loop resistor as the loop resistor is a HART requirement... some loops MAY work without it, but the trade-off is with reliability. |
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