ISL83491 Half Duplex Support

Hi Nathan,

Yes the full-duplex ISL83491 can be configured for half-duplex transmission by connecting the driver outputs to the receiver inputs externally.

In the ISL83495, this connection is done internally.

Here’s page 3 of the data sheet (https://www.renesas.com/en/document/dst/isl83483-isl83485-isl83488-isl83490-isl83491-datasheet), showing the internal connections:

Remember to add the appropriate termination for the cable you’re using (typically 120 Ohms differential for RS-485 twisted pair) at the receiver(A-B on ISL83491)/combined(AY-BZ on ISL83485) input.

 Thanks 

Ajay

Hi Nathan,

Yes the full-duplex ISL83491 can be configured for half-duplex transmission by connecting the driver outputs to the receiver inputs externally.

In the ISL83495, this connection is done internally.

Here’s page 3 of the data sheet (https://www.renesas.com/en/document/dst/isl83483-isl83485-isl83488-isl83490-isl83491-datasheet), showing the internal connections:

Remember to add the appropriate termination for the cable you’re using (typically 120 Ohms differential for RS-485 twisted pair) at the receiver(A-B on ISL83491)/combined(AY-BZ on ISL83485) input.

 Thanks 

Ajay