Brainboxes CC-310 Manuál stáhnout pdf (Strana 57)

PCI VELOCITY / OPTO ISO RS422/485 RS422/485 Information

Chapter 4 Page 47

remain in the receive only mode when they are not being addressed,

they do not transmit any data at all. Figure 4-5 gives the jumper

settings for the serial card in the RS485 Full Duplex mode.

Figure 4-5. RS485 Jumpers, Full Duplex.

• Both jumpers left unconnected (not shorted).

Figure 4-6. RS485 Full Duplex.

Note: The receiver end of MAIN line terminated in characteristic

impedance, stubs off the main not terminated.

Optional Grounding Arrangements.

Proper operation of the cable circuit, according to TIA EIA:

485 A (1995) requires that the cable ground shield is not connected

directly to the equipment ground shield. A current limiting resistor

should be used in series with the shield to avoid possible large

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Brainboxes CC-310 Manuál Strana 57