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GROUND. The threshold level between HIGH and LOW is programmed with DATAFLOW RTU
Programming Software.
P
A
R
A
M
P
A
R
A
M
HIGH
LOW
ABSOLUTE LIMITS
13.1.1
You can invert the input state of a RTU unit, which will cause a DATAFLOW RTU reading a switch as
HIGH to transmit the switch status as HIGH to another DATAFLOW RTU. Inversion allows a NORMALLY
OPEN switch to control a NORMALLY OPEN relay output without external circuitry.
14.
D
I
G
I
T
A
L
O
U
T
P
U
T
S
D
I
G
I
T
A
L
O
U
T
P
U
T
S
14.1
The two digital outputs are defined to be pins 1-3 and 2-4. These outputs are two dry-contact closure
latching relays. They are either OPEN or CLOSED and are controlled by the DATAFLOW RTU software.
The following table defines the characteristics of the relay. The UL/ CSA power rating is the safe operating
region. Operation outside of this region can damage the device.
P
A
R
A
M
P
A
R
A
M
OPEN
CLOSED
UL/CSA POWER RATING
14.1.1
The relays can be programmed to have both initial and fail-safe conditions. The initial condition forces
the relays to a desired state at power on of the device. The fail-safe condition forces the relays to a desired
state if a RF data link problem is detected. For details on how to set these conditions see the DATAFLOW
RTU Software/Programmers Manual.
14.2
If a digital output is used for a warning indicator it is not available to be mapped to the corresponding
digital input of the other unit. This means that if a digital output is used for a warning indicator only one
digital signal may be sent to that DATAFLOW RTU.
14.3
Because the relays are latching relays they retain the state they are in if power to the DATAFLOW RTU
is lost; they will not go to OPEN state during power outage.
15.
A
A
N
N
A
A
L
L
O
O
G
G
I
I
N
N
P
P
U
U
T
T
S
S
15.1
The maximum 6 analog inputs are defined as pins 7, 9, 11, 13, 15 and 17. (NOTE: Pins 15 and 17 are
inputs only if PJ101 and PJ102 are configured as inputs.). These inputs can be of two types: voltage or
current loop. These inputs are used to digitize the analog signal and transmit it to another DATAFLOW RTU.
15.1.1
If the signal to be read is a voltage source, the input pin is ready as is. The following table defines the
characteristics of the input pin working as a voltage input. Absolute limits defines the safe operating region;
operating outside this region can damage the device.
P
A
R
A
M
P
A
R
A
M
INPUT RANGE
SOURCE IMPEDANCE
ABSOLUTE LIMITS
15.1.2
If the signal to be transmitted is a 0 - 20mA current source, the input pin must have a 250W resistor
placed between the pin and GROUND. The following table defines the characteristics of the input pin
working as a current input. Absolute limits defines the safe operating region. Operating outside this region
can damage the device. See below for an example of connecting a current loop sensor to the DATAFLOW
RTU.
E
T
E
R
E
T
E
R
E
T
E
R
E
T
E
R
E
T
E
R
E
T
E
R
M
I
N
I
M
U
M
M
I
N
I
M
U
M
programmable V
Programmable k ohm
0 V
0 ohm
-2 V
M
I
N
I
M
U
M
M
I
N
I
M
U
M
1 M ohm
M
N
I
M
U
M
M
N
I
M
U
M
0 V
-2 V
7
M
A
X
I
M
U
M
M
A
X
I
M
U
M
5 V
infinite ohm
programmable V
programmable k ohm
7 V
M
A
X
I
M
U
M
M
A
X
I
M
U
M
1 ohm
2A 30 VDC
.5A 110 VDC
.5A 125 VAC
M
A
X
I
M
U
M
M
A
X
I
M
U
M
5 V
1000 ohm
7 V
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