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Hello. I bought a MODICON 612 at a garage sale for learning purposes as I cannot go to school and am not getting very far. I have searched this subject and have had about as much success. I have the software set up on a comp with windows 98 and have the unit powered up but when I try to send a program I get "modbus checksum error 20". I used to get error 199 but fixed that but cannot get around this one no matter what I do. I have it configured right and the com1 light just flickers before returning this error. I tried chaning the serial cord to no avail. I realize this thing is as old as the hills and this is a stupid beginner question but I cannot figure it out. Maybe this thing is fried to begin with? I have no problem programing thru the lpt but this is different.
Any help appreciated.
Scott.
Any help appreciated.
Scott.