DannyC Posted July 15, 2011 Report Share Posted July 15, 2011 Hi, We have a M91-2-T1 that we haven't used for a while, and have just got it out again recently. I am trying to communicate with the PLC via RS232, but cannot communicate with the PLC. I am using: USB to serial cable (Prolific, driver version 184.108.40.206), connected to; DB9-RJ11 cable which we made according to the pin assignments in the U90 software manual (we also have another one with the RxD/TxD reversed because we thought we had the two around the wrong way) I also tried using an older computer which has a RS232 port, and no luck there either, so that ruled out the problem of the USB to serial cable. I have checked the COM port and settings (reset everything back to default), and they all seem fine. Is there a way I can test if the connections are correct by say, use HyperTerminal to send commands to the PLC, or is there any way I can find out what the problem might be? Many thanks, Danny Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.