DLMUK
Member
Hi
I have been reading stuff online about the "characteristic resistance" of cable which is best for RS485.
A lot of material says you should have 120ohm when using long lengths. Other web sites say that lower values are OK but you have to match the termination resistors to the character resistance.
Does anybody have any experience of using RS485 devices over cables with different characteristic resistance?
Cheers,
I have been reading stuff online about the "characteristic resistance" of cable which is best for RS485.
A lot of material says you should have 120ohm when using long lengths. Other web sites say that lower values are OK but you have to match the termination resistors to the character resistance.
Does anybody have any experience of using RS485 devices over cables with different characteristic resistance?
Cheers,