ISOLATED FULL DUPLEX RS232C INTERFACE


Posted on Mar 18, 2013

This self powered interface circuit electrically isolates the TxD and RxD lines from the PC serial port and protect the PC from direct connection to hazardous voltages. The isolator is intended to provide electrical isolation between a computer and the equipment connected to its serial port. This can be necessary when the target system works at a completely different voltage level, or when earth loops must be avoided.


ISOLATED FULL DUPLEX RS232C INTERFACE
Click here to download the full size of the above Circuit.

Figure 1 shows how the electrical isolation is achieved. Connector K1 is linked to the serial port of the PC, power to the PC side of the circuit is derived from the signal lines DTR and RTS. Positive supply is derived from RTS and -ve one from the DTR li




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