![]() I have not yet gone through the wiki, going there now. Since I saw other questions about opto-isolators in general in this sub I thought it was the correct place. I did search this sub for an answer and Google before coming here, with no help. That leaves me thinking it doesn't have enough power to operate, it is defective, or it is normal for it to not pass a loopback.Įdit to add, based on the automated message: I thought the DT-9011 might be directional, the instructions call for the female side to be at the host, which it is. I would expect a loopback test to still pass even though it is an optical connection and not a physical one. The Ableconn instructions say to run it off of the 3.3V line on the Pi. ![]() It does not tell me what voltage is needed though. The Model 9268 RS-232 Optical Isolator provides for a complete full-duplex electrical isolation channel between two RS-232 devices without the need for external power. If I remove the DT-9011, and have the loopback wire on the breakout connector it passes.Īccording to the specs of the DT-9011, it is port powered from the TXD, RTS or DTR line, no outside power needed. When I try to do a loopback test with the DT-9011 in place it fails. The RS232 to TTL is an "Ableconn PI232DB9M Compact GPIO TX/RX to DB9M RS232 Serial Expansion Board for Raspberry Pi." This is only using the VCC, GND, TX & RX lines on the Pi. I'm using an RS232 to TTL adapter and a DB9 breakout connector. This is between a Raspberry Pi and a standby generator. ![]() ![]() I'm working on a project that recommended the use of an opto-isolater in a serial communication line. ![]()
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