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© Sealevel Systems, Inc.
2433 Manual | SL9348 8/2021
HARDWARE CONFIGURATION, CONTINUED
The electrical interface settings are maintained across multiple computers. Once the SeaCOM
software driver has been installed on target computers, the 2433 can easily be moved from one
computer to another without having to configure the electrical interface at each computer.
Interface Biasing
1K-ohm pull up/pull down combination resistors bias the receiver inputs and are handled automatically for
each mode. The pull-up (PU) and pull-down (PD) resistor settings are shown in the table below.
Mode
PU Setting
PD Setting
RS-232
Always Off
Always Off
RS-422
Always Off
Always Off
RS-485
Always On
Always On
Line Termination
A 120-ohm resistor is across each RS-422/485 input. If multiple devices are configured in an RS-485
network, only the devices on each end should have the termination in place.
Termination configuration is software selectable for both full- and half-duplex RS-485. By default, line
termination is disabled, and this configuration can be set by placing a check next to ‘Enable Termination’ in
the ‘RS
-
485 Advanced Configuration’ field, as shown in the image below
.