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House battery project is almost done but the required terminating resistor is AWOL. I only have a couple 100s and lots of 470s. I could get close by paralleling 2 100s and put another 100 in series --> 150 Ohms. Or parallel four 470s --> 118 Ohms.

I don't know about the tolerances for Modbus termination. Anyone know if a single 100 Ohm resistor has a chance of working?

Edit: Cable length is about 29 ft (~9 meters) Cat6

House battery project is almost done but the required terminating resistor is AWOL. I only have a couple 100s and lots of 470s. I could get close by paralleling 2 100s and put another 100 in series --> 150 Ohms. Or parallel four 470s --> 118 Ohms. I don't know about the tolerances for Modbus termination. Anyone know if a single 100 Ohm resistor has a chance of working? Edit: Cable length is about 29 ft (~9 meters) Cat6

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[–] • 2 pts

On second thought, as per the reply from I'll go with this little contraption. https://pic8.co/sh/0SDhKl.jpg

One less thing to troubleshoot is worth a lot. Might try the 100 Ohm one later, after everything is set up.

[–] • 0 pt

And for extra science, put a variable resistor and see how far away from 120 ohms you can go in either direction before you get signal issues, see how much of a margin you have on either side.