nkhan Posted July 31, 2018 Report Share Posted July 31, 2018 Im having issues with getting communication from a Unistream 7 to a syringe pump through a usb to RS232 cable. I am trying to use the message composer to send commands over but have not been successful. The brand of pump I am using is Chemyx (https://www.chemyx.com/support/knowledge-base/programming-and-computer-control/serial-rs232-commands/) The cable is good as I can take that same cable, connect to a PC, connect thru putty thru its COM port, and type commands without an issue. I enabled "USB for Serial Communication" under the PLC communication tab only changing the Baud rate to 38400 and message composer was setup with text strings following Unistreams guide but I was not successful in getting communication (http://support.unitronics.com/index.php?/selfhelp/view-article/unistream-and-communication-with-3rd-party-devices). Any ideas as to why I cant send a "start" string or "stop" string? Also does it matter if I use USB 1 or 2? Would a UAC-01RS2 serial module help? I am using the microusb port to connect to the PLC if that matters Thanks Quote Link to comment Share on other sites More sharing options...
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