Do I need a pause?

[mackrackit]

address con %00000001
This equals 1

chk_sum = (address + address)
chk_sum = 2

if A = 0 && B = 0 then keydata = %10101111
keydata = 175

chk_sum = chk_sum + (keydata + keydata)
chk_sum = 2 + 175 + 175

chk_sum = 352

chk_sum var byte
byte = 0 to 255

Maybe try WORD sized variables.

Or maybe I am missing something

[tazntex]

Hello again Dave, you have a good point however I am using Bruce's idea for validating the in coming data. It is my understanding that the checksum will overflow which should not be a problem. I've been using it and that part doesn't seem to be the problem however I will experiment with it to see. I hope your right. Thanks Dave and 73

[mackrackit]

OVERFLOW...Yep I was missing something.
I will keep looking at it.

Do not get the hammer yet.