Hi AlbertHall, Thank you for quick response. We have two equipment's which are connected by RS-232 ports for communication. The ports on eqipment's contain three signals (TXD,RXD,GND). For this we require isolation (5kVrms). The interface device designed shall be plugged between the equipments. The RS232 device is bus powered. no external supply to be used.Is this to use RS232 levels in and out, or logic levels to RS232 levels?
Exactly same device with different mechanics. I am interested in the circuit design implemented within. That would be great help. Could not find any IC or descrte circuit design over internet.
No external power option is available. Since both E2E equipment only have three wire. The Commfront RS232 is just a three wire isolator. I am searching for similar design to be implemented.Interesting,
I wonder where you get the power from to drive an isolator, if you have no power ?
do you rely upon pull ups at the receiver to supply sufficient current for an opto isolator to work ?
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