We have a customer where we already have an Allen Bradley modem kit installed. We have a PC set up here at our place with a US Robotics modem that periodically dials the AB modem (which is connected to a SLC/504) and, using RS Linx with a DDE topic, we log data to an Excel spreadsheet and then save it. The problem we have is that sometimes when the modem dials in to the SLC we may or may not get good data because a particular machine we are monitoring may not be running. I have been asked if we can have the AB modem dial in to the US Robotics whenever the machine starts up so we can get good data. I found a Technote at the Rockwell knowledgebase that shows the necessary programming required to have a SLC automatically dial out. I haven't yet tried it. Has anyone ever done this?