FactoryTalktotheHand
Member
Working with a customer who wants to do some ASCII handshaking between the PLC (a 1769-L24ER) and Labview on a laptop. I can send data from the PLC just fine, but for some reason, when Labview sends an acknowledgement back, the ASCII module doesn't get it.
He has a serial port sniffer program up when he does this and it does send data. After some working last night, I was able to get a transmission from the Laptop to the ASCII module working, but only via YAT, a terminal program. We looked at the hex values being sent with the sniffer, and there's nothing about what YAT sends that looks any different than what Labview is sending, but clearly since YAT is working and Labview isn't, something is different.
I've tried every setting combination in the ASCII module. My baud rates are right. The code I'm using is the A-B sample code rung for rung.
I know absolutely nothing about Labview and I don't really want to. What puzzles me though is that Transmitting works with YAT but not with Labview, but Labview can receive a line just fine.
He has a serial port sniffer program up when he does this and it does send data. After some working last night, I was able to get a transmission from the Laptop to the ASCII module working, but only via YAT, a terminal program. We looked at the hex values being sent with the sniffer, and there's nothing about what YAT sends that looks any different than what Labview is sending, but clearly since YAT is working and Labview isn't, something is different.
I've tried every setting combination in the ASCII module. My baud rates are right. The code I'm using is the A-B sample code rung for rung.
I know absolutely nothing about Labview and I don't really want to. What puzzles me though is that Transmitting works with YAT but not with Labview, but Labview can receive a line just fine.