User Documentation

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4.4 Jumpers
The DIP switches are located beneath the DIP switch panel on the side of the unit.
set switch 3 to ON.
To disable the  set switch 3 to OFF (default setting).
set DIP switches 1 and 2 to OFF (default setting).
To set  set DIP switches 1 and 2 to ON.
Note:
DIP switch 4 is not used (reserved for future function).
Attention:
device when using the RS-232 interface.
Doing so will degrade the RS-232 signals and reduce the effective communication
distance.