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paragraph to attach the mounting bracket to the case. Be sure the narrow portion of the keyhole is
positioned towards the top (UHF antenna connector) of the DATAFLOW RTU.
10.
P
O
W
E
R
P
O
W
E
R
10.1
The RTU power source is a user-provided external power supply meeting the following criteria:
Between 10 VDC and 16 VDC with 12 VDC nominal; Has less than 1 V peak-to-peak of ripple; Provides 1.5
A with the transmitter in low power (2 W) setting; Provides 2.5 A with the transmitter in high (5 W) power
setting.
10.1.1
Connect the positive side of the power supply to J105 pin 6. Connect the negative side of the power
supply to J105 pin 5. The negative side of the power supply is considered to be GROUND and is the
REFERENCE to which all inputs, outputs, and measurements are to be made. GROUND is connected to
the case.
10.2
You may purchase the DATAFLOW RTU with an eight-cell internal battery holder (power option 1). In
this option, internal AA batteries are used as the power source. CAUTION: When installing the batteries, be
sure to match polarities of the batteries with the battery holder. Not matching polarities can damage the
RTU.
10.2.1
The battery voltage appears at pin 7 of J105, and is not connected directly to the input power of the
RTU control board. With jumper PJ106 installed, the battery is jumpered to the input power. With jumper
PJ106 not installed, an external connection is required between pin 6 and 7, which allows the user to install
an external ON/OFF switch to the RTU while using internal power.
10.3
J101 pin 5 is connected to the RTU power source, and J101 pin 6 is connected to GROUND. This
power supply provides excitation voltage to external equipment with maximum current draw of .25 A.
10.4
Fuse F101 (X3.2 - Y0.1) is a 40-gauge tined wire designed to open at 2.5A. If this fuse is destroyed,
replace it with nothing larger than 40-gauge wire.
11.
S
E
R
I
A
L
L
I
N
K
S
E
R
I
A
L
L
I
N
K
11.1
J105 pins 1 and 2 comprises the pair of differential lines used for the RS-485 link. This link provides the
user access to change the software configuration, and allows the RTU to be controlled by an external
computer via RTU Modbus Protocol. The baud rate of this link is programmable between 1200, 2400, 4800,
and 9600 BPS.
12.
I
/
O
M
A
P
P
I
N
G
I
/
O
M
A
P
P
I
N
G
12.1
I/O mapping is the connection of one DATAFLOW RTU input to (another) DATAFLOW RTU output via
radio communication. The current mapping scheme allows any input of any DATAFLOW RTU to be sent to
any output of any other DATAFLOW RTU.
12.2
A digital output being used as a warning indicator is not available for mapping to an input of another
unit; hence, a DATAFLOW RTU having a digital output used in this manner can have only one digital signal
sent to it.
12.3
It is not recommended to use the analog output as a warning indicator. If used, it is not available to be
mapped to an input of another unit, meaning a DATAFLOW RTU having an analog output used in this
manner can have only one analog signal sent to it. NOTE: Be sure to not exceed the load drive capability if
an analog output is used for a warning indicator.
13.
D
I
G
I
T
A
L
I
N
P
U
T
S
D
I
G
I
T
A
L
I
N
P
U
T
S
13.1
The maximum 6 digital inputs are defined as pins 7, 9, 11, 13, 15 and 17 of J101. (NOTE: Pins 15 and
17 are inputs only if jumpers PJ101 and PJ102 are configured as inputs.) Inputs are to be considered either
HIGH or LOW. The following table defines the characteristics of the input pin. The absolute limits are the
safe operating region. Operation outside of this region can damage the device. A HIGH state may also be
obtained by letting the input pin float, and a LOW state my be obtained by connecting the input pin to
6
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