You configured the M1XSP for generic serial port expander with the default firmware? What is the address for the M1XSP? In your rule you need to specify the Port to send out the string and the Port needs to match the address for the M1XSP.
You configured the M1XSP for generic serial port expander with the default firmware? What is the address for the M1XSP? In your rule you need to specify the Port to send out the string and the Port needs to match the address for the M1XSP.