7/4/2023 0 Comments Modbus rtu wiringHow do you calculate the value of a biasing resistor? How would you know where to connect it? Good The reason you might not always use the same value is that the cumulative effect of many device's biasing resistors may make it impossible to signal at all. Nicer vendors provide a choice of biasing resistors selected by switches/jumpers. To do this connect them to the ground or some other voltage using pull-up/pull-down resistors. Solve this problem by pulling the lines to no voltages when they are idle. What happens if for an instant there appears a differential voltage of more than 0.2 Volts? Well, a differential greater than 0.2 is considered a signal and hence constitutes data noise. If an RS485 driver is idle then what? The line is disconnected from the driver in its idle state which means that the + and - are floating.
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