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Without thinking on it too much:

• Send the data as UART-style encoding, with a start/stop bit (maybe from the UART itself)
• encode/decode these UART-style byte-frames using Manchester coding
• transformer-couple as normal for Ethernet over UTP

The issue with LVDS or RS-422, by themselves, don't define a DC-free code, so they don't work so well with transformers and other AC coupling techniques. That's why I suggest Manchester coding. It's what's used for 10Mbit Ethernet. It's fairly simple and yields a DC-free code. It’s feasible to use TTL or a small CPLD to implement it.

An improved version of Manchester uses differential coding. This avoids a number of issues, including idle all-0 / all-1 locking, and polarity swap. Differential Manchester is also known as biphase-mark coding. It’s the protocol used for SPDIF / AES audio.

More here: What is the advantage of differential Manchester

It could also be possible to use an Ethernet PHY chip and make a logic bridge that converts signals to an appropriate MAC stream (MII, RMII), but I think the whole link partner establishment stuff begins to drag the 802.3 camel’s nose into the tent.

Without thinking on it too much:

• Send the data as UART-style encoding, with a start/stop bit (maybe from the UART itself)
• encode/decode these UART-style byte-frames using Manchester coding
• transformer-couple as normal for Ethernet over UTP

The issue with LVDS or RS-422 is that, by themselves, they don't define a DC-free code. So they don't work so well with transformers and other AC coupling techniques like those used with UTP. 

That's why I suggest Manchester coding. It's what's used for 10Mbit Ethernet. It's fairly simple and yields a DC-free code. It’s feasible to use TTL or a small CPLD to implement it.

An improved version of Manchester uses differential coding. This avoids a number of issues, including idle all-0 / all-1 locking and polarity swap. Differential Manchester is also known as biphase-mark coding. It’s the protocol used for SPDIF / AES audio.

More here: What is the advantage of differential Manchester

It could also be possible to use an Ethernet PHY chip and make a logic bridge that converts signals to an appropriate MAC stream (MII, RMII), but I think the whole link partner establishment stuff begins to drag the 802.3 camel’s nose into the tent.

Without thinking on it too much:

• Send the data as UART-style encoding, with a start/stop bit (maybe from the UART itself)
• encode/decode these UART-style byte-frames using Manchester coding
• transformer-couple as normal for Ethernet over UTP

The issue with LVDS or RS-422, by themselves, don't define a DC-free code, so they don't work so well with transformers and other AC coupling techniques. That's why I suggest Manchester coding. It's what's used for 10Mbit Ethernet. It's fairly simple and yields a DC-free code. It’s feasible to use TTL or a small CPLD to implement it.

An improved version of Manchester uses differential coding. This avoids a number of issues, including idle all-0 / all-1 locking, and polarity swap. Differential Manchester is also known as biphase-mark coding. It’s the protocol used for SPDIF / AES audio.

More here: What is the advantage of differential Manchester

Without thinking on it too much:

• Send the data as UART-style encoding, with a start/stop bit (maybe from the UART itself)
• encode/decode these UART-style byte-frames using Manchester coding
• transformer-couple as normal for Ethernet over UTP

The issue with LVDS or RS-422, by themselves, don't define a DC-free code, so they don't work so well with transformers and other AC coupling techniques. That's why I suggest Manchester coding. It's what's used for 10Mbit Ethernet. It's fairly simple and yields a DC-free code. It’s feasible to use TTL or a small CPLD to implement it.

An improved version of Manchester uses differential coding. This avoids a number of issues, including idle all-0 / all-1 locking, and polarity swap. Differential Manchester is also known as biphase-mark coding. It’s the protocol used for SPDIF / AES audio.

More here: What is the advantage of differential Manchester

It could also be possible to use an Ethernet PHY chip and make a logic bridge that converts signals to an appropriate MAC stream (MII, RMII), but I think the whole link partner establishment stuff begins to drag the 802.3 camel’s nose into the tent.

Without thinking on it too much:

• Send the data as UART-style encoding, with a start/stop bit (maybe from the UART itself)
• encode/decode these UART-style byte-frames using Manchester coding
• transformer-couple as normal for Ethernet over UTP

The issue with LVDS or RS-422, by themselves, don't define a DC-free code, so they don't work so well with transformers and other AC coupling techniques. That's why I suggest Manchester coding. It's what's used for 10Mbit Ethernet. It's fairly simple and yields a DC-free code. It’s feasible to use TTL or a small CPLD to implement it.

An improved version of Manchester uses differential coding. This avoids a number of issues, including idle all-0 / all-1 locking, and polarity swap. Differential Manchester is also known as biphase-mark coding. It’s the protocol used for SPDIF audio.

More here: What is the advantage of differential Manchester

Without thinking on it too much:

• Send the data as UART-style encoding, with a start/stop bit (maybe from the UART itself)
• encode/decode these UART-style byte-frames using Manchester coding
• transformer-couple as normal for Ethernet over UTP

The issue with LVDS or RS-422, by themselves, don't define a DC-free code, so they don't work so well with transformers and other AC coupling techniques. That's why I suggest Manchester coding. It's what's used for 10Mbit Ethernet. It's fairly simple and yields a DC-free code. It’s feasible to use TTL or a small CPLD to implement it.

An improved version of Manchester uses differential coding. This avoids a number of issues, including idle all-0 / all-1 locking, and polarity swap. Differential Manchester is also known as biphase-mark coding. It’s the protocol used for SPDIF / AES audio.

More here: What is the advantage of differential Manchester