The HART protocol superimposes audio digital signals on 4~20 mA analog signals. The digital signal amplitude is 0.5 mA and the data rate reaches 1200 b/s. 1200 Hz represents logic "1" and 2200 Hz represents logic "0". Enables two-way digital communication. HART communication has the characteristics of simultaneous point-to-point 4 ~ 20 mA analog and digital communication, multi-station communication methods, and multiple transmissions.The HT1200M is compatible with the SYM20C15 and HT20C15 and with ON OnSemi's A5191HRT and HT2015.

Temperature transmitter technology has been very mature, very common in various factories, transmitters are often used in conjunction with a number of instruments, often in the process of supporting the use of some minor failures. The more common faults and solutions are as follows.

HART communication has the characteristics of simultaneous point-to-point 4 ~ 20 mA analog and digital communication, multi-station communication methods, and multiple transmissions.The HT1200M is compatible with the SYM20C15 and HT20C15 and with ON OnSemi's A5191HRT and HT2015.

HART protocol products Put HT1200M, MC0310, G0310, NCS-TT106H, NCS-TT105H, NCS-PT105H product pictures, more or less.

In the field of industrial automation, HART (Highway Addressable Remote Transducer) protocol serves as a core technological link connecting traditional analog equipment with modern digital management systems. Having undergone nearly forty years of industrial field validation, HART has become one of the most widely deployed field device communication protocols globally. By using Bell 202 FSK modulation technology, digital communication signals are superimposed on a traditional 4-20mA analog current loop, achieving dual-mode coexistence of " analog transmission + digital communication . " This design allows companies to endow existing equipment with digital capabilities such as remote configuration, real-time diagnostics, and multivariate transmission without interrupting existing control loops or re-laying cables.

HT1200M HART Fieldbus Modem： 1. Single chip, FSK modem (Semi-duplex 1200b/s) 2. Integrated receiving the circuit of band-pass filter and transmitting signal waveform shaping 3. External 460.8kHz crystal or ceramic filter 4. Working temperature: -40℃～85℃ 5. Working current: ＜140uA(3.3V） 6. LQFP32 and PLCC28 package