REXROTH PPC-R02.2N-N-Q1-P2-NN Line interface module

REXROTH PPC-R02.2N-N-Q1-P2-NN Line interface module

PPC-R02.2N-N-Q1-P2-NN has two general classes of transmission; single direction transmission and bidirectional transmission. A single direction transmission line, comprised of a single transmitter and a single receiver, is normally terminated only at the receiver end of the line. A single direction transmission line, comprised of a single transmitter and multiple receivers, is normally terminated at both ends of the line. A bidirectional transmission line, comprised of multiple transmitters and one or more receivers, is normally terminated at both ends of the line. Proper termination means that the transmission line is terminated at its end(s) in a resistive value close to its characteristic impedance. A 24-gauge twisted-pair wire, which is a common RS-422/-485 cable, typically has a characteristic impedance of about 100Ω. RS-422A generator circuits are specified to drive a maximum load of 100Ω. RS-485 generator circuits have increased drive capability and are specified to drive a maximum load of 60Ω. This means that the user would normally terminate a bidirectional line at both ends with 120Ω terminations only if all generators on that line are RS-485 compatible. The generators in the PPC-R02.2N-N-Q1-P2-NN may be configured for RS-485. If one or more generators on a bidirectional line are only RS-422A compatible (less drive capability), the user should probably use 240Ω termination at each end.

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