Page 45Hydran* M2 Installation Guide16375 v9.0 Oct 12COMMUNICATIONS & NETWORKINGFor detailed information, refer to Chapter 5 of the Hydran M2 InstructionManual.Forming a Local Network of Hydran M2sFigure 37: Network Overview (Daisy Chaining of Hydran M2s)CAUTION: The LEDs used for the fiber optic transmitter are classifiedas IEC 60825-1 Accessible Emission Limit (AEL) Class 1. Class 1devices are considered eye safe to the naked eye. Do not viewdirectly with optical instruments.Figure 38: Local Communications with a Laptop Computer (for service only)To host computerwith Hydran M2Host via either:• Ethernet (wireor fiber optic)• Modeminterface.• Or RS-485 linkto Hydran 201CicontrollerDaisy chain: RS-485 link, isolated, 1 triadMaximum number of Hydran M2s: 32Maximum total length of cables: 1,200 m (4,000 ft)DB-9connector RS-232 LinkLaptop computer:− Fixed baud rate− 8 data bits− No parity− 1 stop bit− No flow control