Javi (Customer) asked a question.
ViewMarq Serial Communication to PLC unsuccesful
I'm trying to get a "ViewMarq" display to respond to an ASCII string I'm sending to it via serial RS232. I connected a PC running "hyper Terminal" in place of the marquee display as I wanted to confirm that the PLC was sending the command and that the content of the command was what I was expecting. I would like to know if this ASCII string is correct and if so, why the ViewMarq doesn't respond to the message. The ViewMarq doesn't do absolutely nothing.
How many characters in that message?
ViewMarq Help topic VM012 states that the limit is 500
I setup my PLC to send the string command every minute while I troubleshoot my issue. There are three string commands on that picture. My command consist of only 87 characters.
Is your CR ($0D) part of the string, or is it the Terminator code in the PLC comms instruction? -- or both?
Have you tried your string in the Viewmarq software?
The PLC I'm using doesn't have a communication instruction setup interface like the Click, or the Allen Bradley, etc. It is all hard source coding. I have the CR as part of the code I'm using to construct the command string.
The string I'm using, I got it from the ViewMarq software.