P
princo coasters
Guest
G'day Lord Darth.....
In the original post, I have made comment that the controller for the sign
uses a TC232CPE level converter - it does the rs232 - TTL level conversion
and then that output goes to the 8031 processor.
There is only a serial INPUT, no output back to the PC at all - The sign is
just acting as a slave being driven by the software on the PC.
I have confirmed that the level converter IC is working..... -10 or so volts
from the PC gives 4.97V at the output of the IC, and +10 or so volts from
the PC gives close enough to 0V at the output of the IC.
I'm going to hookup a null modem cable between 2 PC's and use something like
HYPER TERMINAL to see exactly what the software is outputting over the
serial port so that I can look for that in the EPROM code.
There must be a command/commands that the sign is waiting for and not
receiving (so as to initialise it and open comms), as it just sits there
displaying the serial number "000618" which is coded into the EPROM.
CHEERS!
"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:UgSsi.2012$ox5.1682@nlpi068.nbdc.sbc.com...
In the original post, I have made comment that the controller for the sign
uses a TC232CPE level converter - it does the rs232 - TTL level conversion
and then that output goes to the 8031 processor.
There is only a serial INPUT, no output back to the PC at all - The sign is
just acting as a slave being driven by the software on the PC.
I have confirmed that the level converter IC is working..... -10 or so volts
from the PC gives 4.97V at the output of the IC, and +10 or so volts from
the PC gives close enough to 0V at the output of the IC.
I'm going to hookup a null modem cable between 2 PC's and use something like
HYPER TERMINAL to see exactly what the software is outputting over the
serial port so that I can look for that in the EPROM code.
There must be a command/commands that the sign is waiting for and not
receiving (so as to initialise it and open comms), as it just sits there
displaying the serial number "000618" which is coded into the EPROM.
CHEERS!
"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:UgSsi.2012$ox5.1682@nlpi068.nbdc.sbc.com...