Is it possible to send serial using Eathernet port like Com-port ( RS232 or db9 )

[Micro Lover]

i found the PDF file (Attached with this Thread), in this file; at page 1 shown that pin6 of rj45 same as pin3 of Com-port and pin3 of rj45 same as pin2 of Com-Port (RxD and Txd)

so is it possible to send serial data via Ethernet using 9600 baud rate ??????????????????

 

[sky_123]

The RJ45 connector was retasked for sending serial data in your doc, but no, it is not related to Ethernet. RS232 and Ethernet are two very different protocols.
You can encapsulate serial data for sending over a different protocol, but that's a different story and it needs hardware and software. You'd need to read up Internet protocols
first (link, n/w, transport, application layers) in detail, or buy a ready-made device to do it - but merely wiring an RS232 connection to an RJ45 connector will not achieve
that aim.

 

[RCinFLA]

Cat 3, Cat 5, and Cat 6 are 100 ohm impedance balanced twisted pair. For short runs you could use two of the twisted pairs for Tx and Rx data leaving the other two pair for a forward and reverse handshaking. You cannot get the full RS232 compliment of DTR, DTS, CTS, and RTS signals, only two of of them. Many llnks are happy with just CTS and RTS with hard wire loop connection for DTR/DTS.

If you want to run long distances then put single ended to balanced drivers and receivers on each of the four pairs with 100 ohm terminations. You also need RS232 driver chips to get the high voltage signalling (> +/- 3v) swing with inverted logic for physical layer RS232.

As to putting COM ports over ethernet, there are software drivers that create virtual com ports on a PC feeding them via regular TCP/IP ethernet protocol.