TIA 485 : A1998(R2012)

1 Scope
2 Definitions, Symbols and Abbreviations
3 Applicability
4 Electrical Characteristics
4.1 Unit Load characteristics
4.1.1 dc Unit Load Specification
4.1.2 ac Load characteristics
4.2 Generator characteristics
4.2.1 Open Circuit output voltages
4.2.2 Differential and offset output voltages
4.2.3 Differential output voltages with common-mode loading
4.2.4 Off-State output current
4.2.5 Short-circuit output characteristics
4.2.6 Transient over voltage tolerance
4.2.7 Output signal waveform
4.3 Receiver characteristics
4.3.1 Input voltage ranges
4.3.2 Input thresholds
4.3.3 Input balance measurements
4.3.4 Receiver unit load test
4.3.5 Transient over voltage tolerance
4.4 Transceiver characteristics
4.5 System requirements
4.5.1 Balanced interconnecting media characteristics
4.5.2 Cable termination
4.5.3 Total load limit
4.5.4 Fail-safe operation
Annexe A (informative)
A.1 Multipoint system configuration
A.2 Data signaling rate vs. cable length
A.3 Stub lengths
A.4 Optional grounding arrangements
A.4.1 Signal common (Ground)
A.4.2 Configuration 'A'
A.4.3 Configuration 'B'
A.4.4 Shield ground
A.5 References

Defines the electrical characteristics of generators and receivers when specified for the interchange of binary signals in multipoint interconnection of digital equipment.