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Raptor MicroATX – Installation Guide
Advantages of Single-Ended Transmission
The advantages of single-ended transmission are simplicity and low
cost of implementation. A single-ended system requires only one line
per signal. It is therefore ideal for cabling, and connector costs are more
important than the data transfer rate, e.g. PC, parallel printer port or
serial communication with many handshaking lines, e.g. EIA-232.
Cabling costs can be kept to a minimum with short distance
communication, depending on data throughput, requiring no more than
a low cost ribbon cable. For longer distances and/or noisy
environments, shielding and additional ground lines are essential.
Twisted pair cables are recommended for line lengths of more than 1
meter.
TIA/EIA-422
TIA/EIA-422 (RS-422) allows a multi-drop interconnection of one
driver, transmitting unidirectionally to up to 10 receivers. Although it is
not capable of bidirectional transfer, it is still applicable and used for
talker-audience scenarios.
Electrical
TIA/EIA-422 (ITU-T V.11) is comparable to TIA/EIA-485. It is
limited to unidirectional data traffic and is terminated only at the line-
end opposite to the driver. The maximum line length is 1200m, the
maximum data rate is determined by the signal rise- and fall-times at
the receiver's side (requirement: <10% of bit duration). TIA/EIA-422
allows up to ten receivers (input impedance of 4 kΩ attached to one
driver. The maximum load is limited to 80 Ω. Although any TIA/EIA-
485 transceiver can be used in a TIA/EIA-422 system, dedicated
TIA/EIA-422 circuits are not feasible for TIA/EIA-485, due to short
circuit current limitations. The TIA/EIA-422 standard requires only
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