Installation/ Operation
19.
DIGITAL OUTPUTS
19.1
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 controlled by the
DATAFLOW RTU
software, and are either OPEN or CLOSED. 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.
PARAMETER
MINIMUM
MAXIMUM
OPEN
1 MQ
CLOSED
1Q
UU
CSA POWER RATING
2A30VDC
.SA 110VDC
.SA 12SVAC
19.l.l 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
DAT AF LOW RTU
Software/Programmers Manual.
19.2
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
thatDATAFWW RTU.
!9.3
Because the relays are latching relays, they retain the state they are in if powerto the
DATAFLOW RTU
is lost;
they will not go to OPEN state during power outage.
20.
ANALOG INPlJTS
20.1
The (up to) six analog inputs are defined as pins 7, 8, 11, 13, 15 and 17. (NOTE: Pins 15 and 17 are inputs only
if PJJ0I 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.
20. l.l If the signal to he read is a voltage source, the input pin is ready as is. The following table defines the
characteristics of the input pin working as voltage input. Absolute limits define the safe operating region;
operating outside this region can damage the device.
PARAMETER
MINIMUM
MAXIMUM
INPUT RANGE
ov
SV
SOURCE IMPEDANCE
1000Q
ABSOLUTE LIMITS
-2V
7V
20.1.2 If the signal to be transmitted is a 0 - 20mA current source, the input pin must have a 250Q resistor placed
between the pin and GROUND. The following table defines the characteristics of the input pin working as a
current input. Absolute limits define the safe operating region. Operating outside this region can damage the
device.
( A-16)
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