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RS-485 and RS-422 are in wide use as an interface for telecommunica-
tions, industrial, medical, security and networking applications. The fol-
lowing sections describe examples of some of popular physical
topologies.
3.1 RS-422 Point-to-Point Circuit
This is the simplest configuration, just one driver and one receiver. If
termination is used, it is only required at the receiver. Most RS-422 cables
used to connect telecom or data-com equipment are point to point links.
The converter can convert an RS-232 device into a Driver node in this
point-to-point circuit.
The configuration is:
SW1-4 TXE Enable Driver always
SW1-6 RXC Enable Receiver RTS/ADC Control
SW1-5 RTS-D Disable RTS control
SW2-1 SDD Disable ADC control