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Part Number: ISO3088
I am planning to use ISO3088 isolation transceiver in a half duplex design. The reference design does not show any termination resistors. between the A and B pair. The device datasheet woth the IO diagram shows an Open Collector configuration, so how does the signal get driven?
Thanks for bringing this to our notice, yes the application report referred do not talk about termination resistor. Let me check on this.
To answer your question, RS-485 network with ISO3088 also requires termination resistor at the longest end of the cable. The cable end has to be terminated with a termination resistor, R(T) whose value matches the characteristic impedance, Z0, of the cable.
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In reply to Tejas Hommaradi:
In reply to Amit Ashara:
The fail safe biasing is at the input of the receiver of side 1 (logic side) and not on the BUS side. Hence this fail safe biasing will not reflect on the BUS.
This fails safe bias ensures that the receiver output is high when ever the BUS is not actively driven and is not the fail safe termination of the BUS.
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