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14
CHAPTER 3
Performing Advanced Functions
Understanding connectors
The POWER Connector
The addSDI devices have cable attachments called connectors.
The connector type determines how the device communicates
with the sensors or the computer.
The RTU's POWER connector, a 5-pin M9 jack, allows for:
•
External charge supply (either a solar panel or an AC adapter)
if the internal rechargeable battery is used. (as in most cases).
•
External power supply (battery or any DC source from 5.6 to
10 volts), with the internal battery removed
•
Communication over a serial connection with 19200 baud
Figure 6 illustrates the connections available at the POWER con-
nector.
Ext Power
Battery
Figure 6. A725 POWER Connector (Top View)
WARNING
The serial line is 3-volt CMOS compatible; therefore,
the above mentioned adapter cable must be used to reach the RS-
232 levels (Adcon item number 200.720.540).
You might want to use the POWER connector with something
other than the standard configuration. For example, if you want to
connect an external battery to the RTU, disconnect the internal
battery and use the configuration shown in Figure 7.
Battery
(5.6 to 10 Volt)
Figure 7. A725 Wiring up an External Battery
5
1
RxD
4
2
3
TxD
Ground
5
1
4
2
+
3
-
Short
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