Adcom A720, A723 manual RTU connectors, Pins on an I/O Connector Top View

CHAPTER 4

Understanding connectors

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Table 2. addIT Receiver Pin Functions

1	Bus Power (V+)
2	Bus Power (GND)
3	Bus Communications (B)
4	Bus Communications (A)

The RTU connectors

The addIT RTU uses standard 7-pin sensor I/O A and I/O B con- nectors (model Binder 702 and 712 series or equivalent) that are identical. Each connector contains three analog inputs (0 to 2.5 volt) and two digital input/outputs, one of which you can use as a pulse counter (for example, a rain gauge). Figure 7 illustrates the individual pins of an I/O connector.

Switched Battery	Cabling 1	(Analog In)
Digital I/O	Cabling 2	(Analog In)
7	1
6	2
5
	3
4
Pulse Counter	Cabling 3	(Analog In)

Ground

Figure 7. Pins on an I/O Connector (Top View)

If you have a special passive extender cable, you can use it to plug more than one sensor to one connector.

CAUTION To avoid cabling conflicts, first verify in the addVANTAGE software that the sensor combination in the configuration you want is allowed. If there are no conflicts, you can physically attach the sensors to the addIT RTU.

addIT RTUs can also be used to control actuators and to switch on or off pumps, valves, or other similar devices (for example, using the Macro extension). The same principles for macro commands using an A730MD remote measuring devices apply to addIT RTUs, with the sole difference that instead of three, only the first two out- puts are available.