User's Manual

Understanding connectors
Cabling 1
Cabling 2
Cabling 3
Switched Battery
Digital I/O
Pulse
Counter
Ground
1
2
3
4
5
6
7
Fig. 9: Pins on an I/O Connector (Top View)
Using Adcon’s 7-pin Y-cable lets you attach 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 you find no conflicts, you
can physically attach the sensors to the A73x RTU.
3.1.2 The POWER Connector
The A73x RTU also has a POWER connector, which allows for:
• External supply (battery or any DC source from 5.6 to 10 volts)
• External charge supply (either a solar panel or an AC adapter) if an internal
rechargeable battery is used
• Communication over serial lines, at 19200 baud
Fig. 10 illustrates the connections available at the POWER connector.
RxD
TxD
Ground
Ext. Power
Battery
1
2
3
4
5
Fig. 10: A73x POWER Connector (Top View)
 WARNING: The serial line is 3-volt CMOS compatible so you must use a special adapter cable
to reach the RS-232 levels. Also, if you use an external battery, you must
disconnect the internal battery.
You might want to use the POWER connector with something other than the
standard configuration. For example, to connect an external battery to the RTU,
disconnect the internal battery and use the configuration shown in Fig. 11.
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