I am building an RS485/modbus controlled device for sensing AC current and switching on/off AC loads. The schematic is given below.
5V DC power for the device and RS485 bus connection are provided through a unique cable, which connects on header SL8.
Given that 5V DC supply is coming from an external source over a long cable (I expect the power/RS485 cable to possibly extend up to around 20meters or so), is it advisable to include additional voltage regulation within the circuit?
Thank you in advance
EDIT: Some more details:
The lowest voltage at which the circuit can operate is 4.3V DC. The circuit draws a current of up to 180mA. The supply source produces regulated 5V DC. As an alternative, I could install a separate power adapter and use a higher voltage source. I am considering to use either Cat6 cable, or a cable such as this: https://www.indiamart.com/proddetail/rs485-2-pair-x-20awg-0-5-sqmm-modbus-armoured-cable-22715928773.html?pos=11&kwd=4+core+twisted+pair+cables&tags=B%7C%7C%7C%7C8211.605%7CPrice%7Cproduct