Unsolicited messages

Unsolicited messages are sent to RSLinx Classic by a message instruction in the processor. For example, a processor has data to send a client application, such as Excel, RSView32, or Visual Basic, on a workstation. To reduce Data Highway traffic, the processor is not continuously polled, but rather it starts a message instruction to the workstation when it needs to send the data. This message is sent from the processor to RSLinx Classic via the communication device. If any clients actively request the data from this processor (via a DDE hotlink to an unsolicited topic), RSLinx Classic forwards the incoming data to the client. If no clients have requested data, RSLinx Classic discards the message, and the message instruction will error out in the processor.
To enable RSLinx Classic to receive unsolicited messages:
  1. From the Control bar, select
    DDE/OPC > Options
    .
  2. On the
    General
     tab, select
    Accept UDP Messages on Ethernet Port
    .
    TIP:
    This option is enabled by default in RSLinx Classic version 4.00 or earlier. Starting from RSLinx Classic version 4.10, this option is disabled by default.
Examples
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