| 摘要 |
A HART communication-compatible device having a HART communication function for transmitting and receiving HART communication signals generated through superimposing an AC signal that is a combination of 1200 Hz and 2200 Hz frequency signals onto a DC signal of between 4 and 20 mA, including a receiving portion for receiving a HART communication signal, a signal detecting portion for detecting an AC signal of the HART communication signal using the HART communication signal received by the receiving portion; and an indicator portion for indicating, during the interval over which the AC signal is detected by the signal detecting portion, that an AC signal is detected. |
