5Chapter 2. Using the addSDIThe A725 addSDI Remote Telemetry Unit (RTU) is part of the A7xxseries. For testing purposes, you should have an A840 TelemetryGateway installed before you install the A725 RTU. For informa-tion about installing the A840, refer to theBase Station, TelemetryGateway A840 and Wireless Modem A440 User Guide.Opening the packagesThe addSDI RTU package contains the A725 RTU, an antenna, anda pipe clamp. If ordered, the following items come in separatepackaging:• A solar panel and pipe clamp• A set of aluminum poles• A LED tool• Sensors and cables, one box for each sensor.Make sure you have received all the equipment and read throughthe instructions that follow. Once you are sure to understandthem, you are ready to install your RTU.