9
© Sealevel Systems, Inc. 3543 Manual | SL9119 9/2022
If the
SIO4-104.485
is equipped with the optional 16C954, (Item Number 3543-SN) a hardware mode can
be selected in the UART that will also enable the RS-485 drive automatically.
Line Termination
Typically, each end of the RS-485 bus must have line-terminating resistors (RS-422 terminates at the receive
end only). Typically a 120-ohm resistor is across each RS-422/485 input in addition to a 1K-ohm pull-
up/pull-down combination that biases the receiver inputs. If multiple
SIO4-104.485
adapters are configured
in an RS-485 network, only the boards on each end should have the termination in place
.
Contact Sealevel
Technical Support if you have questions on how to remove this termination.
RS-485 ‘Echo’
The RS-485 ‘Echo’ is the result of connecting the receiver inputs to the transmitter outputs. Every time a
character is transmitted; it is also received. The
SIO4-104.485
automatically suppresses this ‘Echo’.
Software Installation
Windows Installation
Do not install the Adapter in the machine until the software has been fully installed
.
Only users running Windows 7 or newer should utilize these instructions for accessing and
installing the appropriate driver via Sealevel’s website. If you are utilizing an operating system
prior to Windows 7, please contact Sealevel by calling 864.843.4343 or emailing
to receive access to the proper driver download and installation
instructions.
1.
Begin by locating, selecting, and installing the correct software from the website -
2.
Select the “SeaCOM for Windows” download link.
3.
The setup file will automatically detect the operating environment and install the
proper components.
To confirm that the SeaCOM driver has been successfully installed, click on the ‘Start’ button, and then
select ‘All Programs’. You should see the ‘SeaCOM’ program folder listed.
You are now ready to proceed with connecting the 3543 to your system. Refer to the Hardware
Installation section for details.
