User's Manual

7
Chapter 1. Introduction
This manual describes the use of the A840 Telemetry Gateway and
A440 Wireless Modem combination. Due to their general nature,
either unit can also be used independently, but such uses are
beyond the scope of this manual. The manual teaches you how to
use the telemetry gateway and the wireless modem as a base sta-
tion for an Adcon wireless network.
To build a network, you need one or more A730MD, A733, A720,
or A723 remote telemetry units (RTUs), an A840/A440 base sta-
tion, and the addVANTAGE software. For additional information
concerning the RTUs and the addVANTAGE software, consult the
respective user manuals.
The A840 Telemetry Gateway is a low-power, battery-backed
device that acts as an interface between an Adcon wireless net-
work and one or more hosts running addVANTAGE or similar data
acquisition software. The gateway is based on a powerful 32-bit
processor running the Linux operating system. It has 16-MB Flash
EPROM acting as a hard disk and 16 MB RAM. The software can
be upgraded in the field.
Several interfaces are available: ethernet, V34 modem, RS-232
serial, and RS-485 multidrop serial. A built-in rechargeable battery