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RS-232/485 CONVERTER
S2-3 and S2-4: “Transmit Off” Impedance
Switches S2-3 and S2-4 are set together to determine
whether the receiving device “sees” the impedance
of the Converter’s transmitter as being “high” or
“intermediate” when the transmitter is turned off.
The “intermediate” setting is useful in half-duplex
environments where the receiving device does not
respond well to the “high” setting.
S2-3 S2-4 Setting
On On Intermediate impedance
Off Off High impedance
3.2 Typical Applications
The Converter is commonly used in five types
of applications:
• 4-wire/full-duplex/point-to-point
• 4-wire/half-duplex/point-to-point
• 2-wire/half-duplex/point-to-point
• 4-wire/multipoint
• 2-wire/multipoint