We have a nodebus system with an AB30 gateway connected to 3 PLC's over phone lines via modems. The three modems are connected to the gateway on an RS485 chain to the gateway. However, when one modem link fails ( bad phone line? ) the gateway communication eventually fails to all 3 modems. The only successful recovery has been to reboot the AB30. Has anyone else experienced a similar problem? We are experimenting with periods, phasing, watchdog timer, retries, etc. to segregate the traffic. Suggestions? Solutions? Stephen T. Woodworth FeedForward, Inc. 1341 Canton Road, Suite H1 Marietta, GA 30066 mailto:[EMAIL PROTECTED] ----------------------------------------------------------------------- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with "unsubscribe foxboro" in the Subject. Or, send any mail to [EMAIL PROTECTED]