User's Manual

Performing Advanced Functions
selecting pull-up or pull-down for the digital inputs. Jumpers J7 (AIN1) to J10
(AIN4) and J11 (AIN8) to J14 (AIN5) determine whether the analog inputs are used
as voltage or as current inputs (see Section 3.1.3).
4
3
2
1
J2
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
J11 J12 J13 J14
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
J4 J3J6 J5
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
J10 J9 J8 J7
2
4
1
3
J1
Fig. 17: Digital outputs
3.3 Checking the RTU’s Status
The A740 features an integrated button and an LED, which can be used for
checking the RTUs battery status. This button can be used to start the RTU, if in
off state, by pushing the button for at least 1 second.
If the RTU is already operating pushing the button for less than a second will make
the LED flash in half-second intervals if the battery voltage is higher than 5.5V. If
the batteries voltage is in the range from 5.0V to 5.5V, the blinking occurs in
two-second intervals.
Holding down the button for at least two seconds until four blinks of 1/8
th
of a
second each are signaled by the RTU will trigger a connectivity test as soon as the
button is released (fur further information see section 5).
If you keep the button down for another 2 seconds, until four more blinks of 1/8
th
of
a second are flashed, the RTU will shut off as soon as the button is released. You
can recognize this when the RTU stops blinking in the 1/8
th
second intervals.
Note: The RTU cannot be turned off if external power is fed into the RTU via the power
connectors EXTPS input. In this case the RTU will flash the LED for one minute
and try to turn itself off. Removing the power connector will then cause the RTU to
shut down.
3.4 Communicating with the RTU
You can use a Windows HyperTerminal window to connect to the addNODE RTU.
After you have installed the system, follow these steps to configure the device and
set the default parameters:
26