Comtrol Modbus Server - Manual (Page 40)

40 - Troubleshooting and Technical Support DeviceMaster Modbus Server User Guide: 2000535 Rev. C
Technical Support
Technical Support
It contains troubleshooting procedures that you should perform before contacting
Technical Support since they will request that you perform, some or all of the
procedures before they will be able to help you diagnose your problem. If you need
technical support, use one of the following methods.
Comtrol Contact Information
Downloads ftp://ftp.comtrol.com/html/up_modbus_server_main.htm
Web site http://www.comtrol.com
Phone 763.957.6000