Filter
Top Products
24
RS-232↔485/422 CONVERTERS
Figure 7 shows a typical multipoint, 4-wire, full- or half-duplex connection. Figure 8
shows a typical multipoint, 2-wire, half-duplex connection. In the multipoint
applications depicted in Figures 7 and 8, the devices at the extreme opposite ends
of the installation are terminated by setting switch S2 to the TERM position. These
devices are the two devices that have the greatest cable length between them, not
necessarily the devices that are physically located the farthest apart. (See Figures 7
and 8.) A resistor shown in the circuit indicates that the termination resistor has
been selected via switch S2. Note that although Figures 7 and 8 show only four
RS-232↔485/ 422 Converter devices networked together, up to 64 units can be
connected in the manner shown in Figure 7, and up to 32 units as shown in
Figure 8.
Figure 7. Multipoint, 4-Wire (Half- or Full-Duplex).