Eaton XN-1RS232 User Manual

1 Product DescriptionGeneral product description10 XI/ON: XN-1RS232 09/2011 MN05002013Z-EN www.eaton.com• Bit transmission rate: 300 bit/s to 115200 bit/s.• Data bits: 7 or 8 user data bits in a data frame.• Parity: none, even or odd.• Stop bits: 1 or 2 bits.The data flow control can be implemented eitherwith a hardware handshake (RTS/CTS) or softwarehandshake (XON/XOFF) routine.Data exchangeThe XN-1RS232 module provides a 64 bytetransmit buffer and a 128 byte receive buffer fordata exchange with the field device.The data transmission from the communicationpartner (e.g. PLC) to the transmit buffer of theXN-1RS232 module or from the receive buffer ofthe XN-1RS232 module to the communicationpartner is organised via an 8-byte data channel intoprocess output or input data. One byte of a datapacket is used for status information and controldata in order to ensure fault-free transmission.The diagnostics messages can also be embeddedin the process input data depending on thefieldbus used. In this case, the process output datacontains a byte for triggering the clearing of thereceive and transmit buffer. This thereforereduces the user data part of a data packet to 6bytes.