Part Number: THVD4411
Hello there,
Several questions in this forum for the THVD4411 have already talked about RS232 and half-duplex RS485 sharing the same bus signals on a connector. I've seen that R1 and R3 should be connected at the THVD4411, and then on the connector we have RS232 TX sharing the bus line with HD-RS485 inverting, RS232 RX sharing the bus line with HD-RS485 non-inverting, and bus ground is common to both modes. There are still some questions I have after reading this forum and the THVD4411 documentation:
- Will the THVD4411 survive in RS232 mode if a half-duplex RS485 signal is plugged in by accident assuming the bus lines are shared as written above? Will the half-duplex RS485 down the line survive, assuming it is also compliant with standards?
- Will the THVD4411 survive in half-duplex RS485 mode if a RS232 signal is plugged in by accident assuming the bus lines are shared as written above? Will the RS232 device down the line survive, assuming it is also compliant with standards?
- The standard for RS232 specifies that receivers must survive +/- 25V, but the abs max for this device shows +/-16V on the bus pins. Will the THVD4411 survive a +/- 25V RS232 signal?
- Section 5.12 mode switching characteristics shows timing from shutdown to RS232, RS232 to FD-RS485, FD-RS485 to RS232, FD-RS485 to HD-RS485, HD-RS485 to FD-RS485. Can the THVD4411 go from shutdown to HD-RS485 directly, or would the timing be the sum of the specs for shutdown to RS232 plus RS232 to FD-RS485 plus FD-RS485 to HD-RS485?
Joseph
