P
P
A
A
R
R
A
A
M
M
E
E
T
T
E
E
R
R
M
M
I
I
N
N
I
I
M
M
U
U
M
M
M
M
A
A
X
X
I
I
M
M
U
U
M
M
INPUT RANGE 0 mA 20 mA
SOURCE IMPEDANCE (Ev-5)/.02 ohm
ABSOLUTE LIMITS -8 mA 28 mA
15.2 All analog inputs are non-isolated. All analog measurements are referenced to GROUND. Take care
when connecting the DATAFLOW RTU to external sensors.
15.3 The user can invert the input state of a DATAFLOW RTU if desired, which will cause a DATAFLOW
RTU that reads an analog signal as full scale to transmit the signal status as a 0 scale to another
DATAFLOW RTU. This inversion allows a positive transfer function signal to control a negative transfer
function signal without external circuitry.
15.4 Sensor excitation voltage may be supplied by the DATAFLOW RTU using the J101 pin 5 Power Out
pin. For this configuration, make sure to not exceed the maximum current drive of the pin, and ascertain
your sensor will operate on a supply voltage of Vsupply-5Volts.
16.
A
A
N
N
A
A
L
L
O
O
G
G
O
O
U
U
T
T
P
P
U
U
T
T
S
S
16.1 The two analog outputs are defined to be pins 15 and 17. (NOTE: Pins 15 and 17 are outputs only if
PJ101 and PJ102 are configured as outputs.). These outputs are two low power outputs hardware
configured as either a voltage source or a current sink. All analog outputs are referenced to GROUND.
16.1.1 If the output pin is desired to be a voltage source, correctly set the hardware configuration. The pin is
to be hardware-configured as an output and as a voltage source. The following table defines the
characteristics of the output pin set as a voltage source. Attempting to drive a load less than the minimum
will cause incorrect output and possibly damage the device.
P
P
A
A
R
R
A
A
M
M
E
E
T
T
E
E
R
R
M
M
I
I
N
N
I
I
M
M
U
U
M
M
M
M
A
A
X
X
I
I
M
M
U
U
M
M
OUTPUT RANGE 0 V 5 V
LOAD RESISTANCE 1000 ohm
16.1.2 If the output pin is desired to be a current sink, correctly set the hardware configuration. The pin is to
be hardware configured as an output and as a current source. The following table defines the characteristics
of the output pins set as a current sink. Attempting to drive a load less than the minimum will cause incorrect
output and possibly damage the device.
P
P
A
A
R
R
A
A
M
M
E
E
T
T
E
E
R
R
M
M
I
I
N
N
I
I
M
M
U
U
M
M
M
M
A
A
X
X
I
I
M
M
U
U
M
M
OUTPUT RANGE 0 mA 20 mA
LOAD RESISTANCE (Ev-5.5)/.02 ohm
16.2 The analog outputs can be programmed to have both initial and fail-safe conditions. The initial
condition forces the output to a desired state at power ON of the device. The fail-safe condition forces the
output to a desired state if a RF data link problem is detected. Refer to DATAFLOW RTU
Software/Programmers Manual for details on setting these conditions.
16.3 Meter excitation voltage may be provided by the DATAFLOW RTU using the Power Out pin 5 of
connector J101. If the Power Out pin is used as the excitation supply make sure that the maximum current
drive of the pin 5 is not exceeded and that your indicator will operate on a supply voltage of Vsupply-
5.5Volts.
16.4 It is not recommended to use the analog output as a warning indicator. If used, it is not available to be
mapped to the corresponding analog input of the other unit, meaning that 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.
17.
T
T
H
H
E
E
O
O
R
R
Y
Y
O
O
F
F
O
O
P
P
E
E
R
R
A
A
T
T
I
I
O
O
N
N
17.1 The DATAFLOW RTU control board performs many functions. It is used to program and control the
DTX RF board. It is the real-world interface for the telemetry inputs and outputs. It communicates to devices
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