Up to 31 meters can be connected to one communication backbone using the RS-485 option board. It provides a multiple meter connection to a communication node via an RS-485 network and RS-485/RS-232 converter-controller. Additional meters can be added if an RS-485 repeater or another RS-485 converter-controller is added to the circuit. The RS-485 Option Board cable exits the meter through an opening at the meter base and terminates at an RJ-11 jack. The RS-485 Option Board is designed solely for use on time-of-use meters.

 Elster RS-485 Option Board