Isolated RS-485 interface circuit

The isolated RS-485 interface circuit is shown in the figure. This circuit can
isolate and transmit the serial data of the RS-485 interface, and the transmission is bidirectional.
    The circuit is mainly composed of bidirectional transmission, dual isolation amplifier JS0150 and bidirectional transceiver LTC1485. IS0150
transmits data when R/T2A (receive/transmit) = o and R/TIA (receive/transmit) = o. At this time, the D2A end data is transmitted
to D2B, and the DIA end data is transmitted to DIB; R/T2A (receive/transmit) )=1, receive
data when R/TiA (receiving/transmitting)=1, at this time the D2B end data is transmitted to D2A. DiB side data is transmitted to Dl^. Whether IS0150 transmits or receives data
is determined by the level of DF and /RE terminals. The signal is isolated and transmitted by IS0150, and then further buffered by LTC1485 before output. The bidirectional
transceiver LTC1485 works on the same principle as the IS0150, but it does not isolate the transmitted signal.