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Communicating with ethernet to serial LED sign - is this feasible?

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Top Forums Shell Programming and Scripting Communicating with ethernet to serial LED sign - is this feasible?
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Old 01-09-2020
If you can unplug the ethernet-RS232 adapter from the display I think I'd be inclined to test the ethernet-RS232 adapter by shorting pins 2 & 3 (is this a DB9 or a DB25 connector) to loop back any received characters, make a connection over ethernet and see if the adapter echos the characters typed. Also, directly connect a laptop to the serial input of the display (using an old laptop with a DB9 serial connector or a USB-serial adapter) and see if you can control the display using the commands given.

Once both of those tests are done reconnect the ethernet-RS232 adapter to the display. Remember to also consider baud rates, 8 bit or 7 bit, stop bits, and parity/no parity which could also cause it not to work until they are aligned.
Last edited by hicksd8; 01-09-2020 at 12:46 PM..
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LEARN ABOUT CENTOS

massagevendor

MASSAGEVENDOR(8)					      System Manager's Manual						  MASSAGEVENDOR(8)

NAME

       massagevendor - convert the ethernet vendor codes master list to arpwatch format

SYNOPSIS

       massagevendor vendorfile

DESCRIPTION

       massagevendor is a program that converts a text file containing ethernet vendor codes into a format suitable for use by arpwatch(8) and
       arpsnmp(8).  The input vendorfile is a master text file containing vendor codes. The output is sent to stdout.  Each line of the vendorfile
       is expected to have a six digit hexadecimal vendor code followed by spaces followed by the name of the manufacturer.

       All ethernet devices have a unique identifier which includes a vendor code specifying the manufacturer of the device. In normal operation
       arpwatch(8) and arpsnmp(8) use the file ethercodes.dat to report this vendor code.  massagevendor is used to generate the ethercodes.dat
       file from text files containing these vendor codes.

       Locations where an ethernet vendor codes master text file can be obtained are given below.

FILES

       /var/lib/arpwatch - default location of the ethernet vendor list
       ethercodes.dat - file containing the list of ethernet vendor codes

SEE ALSO

       arpwatch(8), arpsnmp(8)

NOTES

       Sources for ethernet vendor codes seen in the wild are

	      http://map-ne.com/Ethernet/vendor.html
	      ftp://ftp.cavebear.com/pub/Ethernet.txt
	      http://www.cavebear.com/CaveBear/Ethernet/vendor.html

       Useful for comparison or completeness are the
       ethernet vendor codes as assigned
       by the IEEE which can be found at

	      http://standards.ieee.org/regauth/oui/oui.txt

BUGS

       Please send bug reports to arpwatch@ee.lbl.gov.

AUTHORS

       Craig Leres of the Lawrence Berkeley National Laboratory Network Research Group, University of California, Berkeley, CA.

       The current version is available via anonymous ftp:

	      ftp://ftp.ee.lbl.gov/arpwatch.tar.gz

       This manual page was contributed by Hugo Graumann.

																  MASSAGEVENDOR(8)