User's Manual

Table Of Contents
CHAPTER 3
Performing Advanced Functions
18
Device series
Currently, two A723 device versions are in use: Series 3 and
Series 4. You can determine which series a device is in any of these
ways:
The TYPE command. When the device is connected, you can
type this command to the series. With a Series 3 device, the
command returns TYPE A723 , while with a Series 4 device,
the return is TYPE A723 Series 4. This is the most reliable
method of determining which series you have.
The logo on the front of the device. Series 4 devices include
such wording on the logo. However, if you returned a Series 3
device for repair, it is possible that it was replaced with a
Series 4 motherboard. In such a case, you would have a
Series 4 device in Series 3 housing.
Understanding connectors
The addIT devices have cable attachments called connectors. The
connector type determines how the device communicates with the
sensors or the computer.
The RTU connectors
The addIT RTU uses standard 7-pin sensor I/O A and I/O B connec-
tors (model Binder 702 and 712 series or equivalent) that are iden-
tical. Each connector contains three analog inputs (0 to 2.5 volt or
if configured 0-225mV) and two digital input/outputs, one of which
you can use as a pulse counter (for example, a rain gauge). Alterna-
tively, the I/O A digital input/output can be configured as a SDI-12
interface. Figure 3 illustrates the individual pins of an I/O connec-
tor.
Figure 3. Pins on an I/O Connector (Top View)