gherman Posted October 28, 2015 Report Share Posted October 28, 2015 Hello, I am new to Unitronics and have just bought a SAMBA unit (SM43-J-R20) with the optional serial port (V100-17-RS4X) and I need some help with getting started. I need to read a load cell via RS232 from the optional port, but am having issues doing so. I've watched some webinars about MODBUS, but am not sure if this is what I need and if it is, what parameters I need to enter. I am using a Cooper Instruments load cell with a digital display. I found the following information in a PDF for the load cell: The output string is in the following format: <STX> <SIGN> <WEIGHT(7)> <STATUS> <ETX> Where STX: Start of transmission character (ASCII 02). ETX: End of transmission character (ASCII 03). SIGN: The sign of the weight reading (space for positive, dash (-) for negative). WEIGHT(7): A seven character string containing the current weight including the decimal point. If there is no decimal point, then the first character is a space. Leading zero blanking applies. STATUS: Provides information on the weight reading. The characters G/N/U/O/M/E represent Gross / Net / Underload / Overload / Motion / Error, respectively. On the PLC Info screen, I have the following information for COM 2: Protocol: MODBUS RS Type: RS232 Params: 9600 ,8,n,1 Silence: 3650us the Rx value is constantly incrementing, but under the Monitor screen, there is no value. Any help would be greatly appreciated as I am new to Unitronics and don't know where to begin. Thank you for your time. Quote Link to comment Share on other sites More sharing options...
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