Contemporary Controls ARCNET USB22-4000 Installatiehandleiding - Pagina 6

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-4000 AC-Coupled EIA-485

The AC-coupled EIA-485 transceiver offers advantages over the DC-

coupled version. No bias adjustments are needed and wiring polarity is

unimportant. Much higher common mode voltage levels can be achieved

with AC coupling because the transformer coupling has a breakdown

rating of 1000 VDC.

However, AC-coupling also has disadvantages. AC-coupled segments

are shorter (700 feet max) and are limited to 13 nodes compared to 17 for

DC-coupling. Also, AC-coupled transceivers operate only at 1.25, 2.5,

5.0 and 10 Mbps, whereas DC-coupled transceivers function over all

standard data rates.

Cabling rules for USB-4000 are similar to those for USB-485. Wire nodes

in a daisy-chain fashion.

Refer to Figure 1 for connector pin

assignments. Termination should only be applied to a device located at

the two ends of the segment. Do not mix AC-coupled and DC-coupled

devices on the same segment; however, bridging the two technologies is

possible with active hubs that have appropriate transceivers.

TD040900-0IE