This existing design perfectly fine for a DMX transmitter. Unlike receivers, DMX-512 transmitters are not isolated. The isolation required in receivers will pro

This existing design perfectly fine for a DMX transmitter. Unlike receivers, DMX-512 transmitters are not isolated. The isolation required in receivers will protect the transmitter from the condition you described. EIA-485 specifies the electrical properties of the signal, however the ESTA E1.11 (DMX-512) specification further constrains it in section 5 and 6 in regards to grounding and isolation. Annex A of the specification does provide allowance for non-isolated transmitters where common-mode voltage is expected, but this is specifically not recommended: https://tsp.esta.org/tsp/documents/docs/ANSI-ESTA_E1-11_2008R2018.pdf https://tsp.esta.org/tsp/documents/docs/ANSI-ESTA_E1-11_2008...