Connecting The RACO® Catalyst® RTU To The Hach Water Distribution Panel Using The Mod I/O Modbus Interface Module

The purpose of this application note is to act as a quick start guide when using the Catalyst RTU (Remote Telemetry Unit) with the Hach WDP (Water istribution Panel).

The Catalyst RTU functions as an auto-dialing remote alarm monitor and data logger. Auto-dialers and RTUs are typically used at remote, unattended ocations, to monitor the condition of automatic equipment. The mission of an Autodialer/RTU is to compare inputs against alarm criteria. Then if alarm violations occur, the RTU calls maintenance personnel (or a central station computer) to inform them of the "out of normal" condition at the remote site. Alarm notification reports are typically made to operators as voice reports. However, data reports to central computers can be made as well.

Figure 1 illustrates a WDP/Catalyst system. A Mod I/O Gateway is connected to the WDP (Water Distribution Panel) via the AquaTrend network. The Catalyst RTU is connected to the Mod I/O via a RS232 null modem cable. The Catalyst RTU is connected to a POTS (Plane Old Telephone System) via a RJ11 phone cable. The Catalyst unit monitors the WDP via the Mod I/O Modbus interface and reports to the telephone and/or computer the periodic status of the monitored signals. The Catalyst can also notify both the telephone and computer in the event of user defined Alarm conditions.