REXROTH VCP25.2DVN-003-NN-NN-PW touch screen
Having the terminations exactly match the characteristic impedance of the transmission line is usually not critical to most VCP25.2DVN-003-NN-NN-PW applications. The termination values would only be of critical importance when the limits of baud rate and/or line length are being driven to the maximum. Sometimes the final value chosen for termination will be a trade-off between the wave shape and the voltage swing of the signal. RS-485 and RS-422A networks are designed to be wired in a point-to-point fashion. All devices are wired in line, one after another forming a single main line (a bus topology). Stub lengths off of the main line are not recommended. If a RS-485 receiver is not being used (left disconnected), it is possible that noise on the inputs will be generated; therefore, the user should ground all unused inputs.
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