11
When setting-up a system for half-duplex operation, it is necessary to add two jumper
wires as shown in Figure-10. As previously mentioned, maintaining the correct wire
polarity is required for proper operation.
Figure-10
Half Duplex Configuration
Multi-Drop Configuration:
A hypothetical multi-drop system is illustrated in Figure-11, consisting of three
transceivers and a single receiver node. As shown, two transceivers are attached at the far
ends of the cable, while nodes 1 & 2 can be attached anywhere in-between. Notice that
the nodes do not have termination resistors attached, and it is for this reason that the cable
length for the stubs should be kept as short as practical to avoid signal distortion. The
total number of node attachments is only limited by the unit loading of each receiver,
with the bus supporting 32 unit loads maximum.
Содержание RS-485
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