| 摘要 |
<p>The invention relates to an analogical interface for the acquisition, digital memorization and serial transmission of data taken over from two analogical entries. According to the invention, the interface consists of a converter (I/V) which transforms the current from the two entries with values of 4...20 mA, into voltage needed for memorizing in a block (AD/DA), an analogical multiplexor (AMUX) which multiplexes/serializes the outputs from the block (AD/DA) and a converter (V/I) which provides a current output with values of 4...20 mA of the interface, the identification of the signals from the serial output being performed on a second current output with values of 4...20 mA, by a signal identifying block (BSI) by current levels pre-established and correlated with the values from the analogical signal output, the selection of the signal measured at the entrance being performed by means of a probe selection block (BSS), a time base and a logical interface (BTIL) having the control of the temporal event succession, at the entire interface level, and a condition signaling block (BS) indicates the condition thereof at a certain time moment, all the blocks (AD/DA, BSI, BSS and BS) being coupled with a supply source (SA).</p> |
