Product Review: Pro-Lite Scrolling Message Signs

Hello Ray,
My name is Guy Tieman and I work for a sign and mill company. I just stumbled on this site while reseaching a few things and saw your interest in scrolling message boards. We are an OEM of several different LED displays. We are located in Fort Myers, Florida. Our number is (239) 936-9154. If you are still looking give me a call or e-mail me. I might be able to help.
Thanks for your time,
Guy

Here is the code to calculate the checksum.
The checksum is an xor of all the characters sent, without the first ID tag and without the end E tag.


static unsigned char
checksum(const char *str, unsigned char init)
{
unsigned char i = init;

while (*str != '\0') {
i ^= *str;
str++;
}

return (i);
}

int
main(int argc, char *argv[])
{
unsigned char csum = 0x0;

if (argc != 2)
exit(-1);
else
msg = argv[1];

csum = checksum(msg, csum);
printf("%02X\n",csum);
return (csum);
}

if you are using serial interface, send a

message to it to erase everything
--ed

Wanderful!!!

Realy congratulations friend.

Leandro
drinhow@hotmail.com