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RS-232/485 CONVERTER
3.1.1 DIP S
WITCH
S1 S
ETTINGS
DIP switch S1 is used to configure receive impedance
(termination), 2-wire/4-wire operation and “echo”
enable/disable. Table 3-1 shows the factory-default
settings for switch S1. Following Table 3-1 is a
detailed description of each switch.
Table 3-1. Switch S1 Summary Table (factory defaults in bold)
Position Function OFF Position ON Position
S1-1 RCV impedance (termination) 16 K ohms, typ. 120 ohms
S1-2* 2-wire/4-wire 4-wire 2-wire
S1-3* 2-wire/4-wire 4-wire 2-wire
S1-4 Echo Mode Echo OFF Echo ON
*Switches S1-2 and S1-3 should be switched simultaneously.