15.5.3 The following calculations apply to RTU-BATN1CD, using a 14V source.
RI
=
(14 - 0.4 - 12)
I
.05
=
32 Q
PR!= (14-0.4- 8)
2
/RJ = 0.98 W
DATAFLOWRTU
15.5 .4 For RTU-BA TI-IOLD, use a rechargeable battery type. Confirm the manufacturer's specification for full charge
voltage, empty voltage, and "'trickle" charge current.
16.
SERIAL LINK
I 6. I
JI 05 pins I 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
MODBUS RTU Protocol. The baud rate of this link is programmable between 1200, 2400, 4800, and 9600 BPS.
17.
l/0 MAPPING
17. I
l/0 mapping is the connection of one
DATAFLOW RTU
input to (another)
DATAFLOW RTU
input 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.
17 .2
A digital output used as a warning indicator is not available for mapping to an input of another unit. Because of
this, a
DATAFLOW RTU
having a digital output used as a warning indicator can have only one digital signal
sent to
it.
17.3
Using the analog output as a warning indicator is not recommended. If used in this way, 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 as a warning indicator.
18. DIGITALINPUTS
18.I
The (up to) six digital inputs are pins 7, 9, 1 I, 13, 15 and 17 of JIOI. (NOTE: Pins 15 and 17 are inputs only if
jumpers PJI0J and PJI02 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 be obtained by Jetting the input pin float, and a LOW state may be obtained by connecting the
input pin to GROUND. The threshold level between HIGH and LOW is programmed with
DATAFLOW RTU
Programming Software.
PARAMETER
MINIMUM
MAXIMUM
HIGH
programmable V
5V
programmable kQ
infinite Q
LOW
ov
programmable V
on
oroarammable kQ
ABSOLUTE LIMITS
-2 V
7V
18.1.J You can invert the input state of an RTU unit, which will cause
aDATAFWW RTU
reading a switch as HIGH
to transmit the switch status as LOW to another
DATAFWW RTU.
Inversion allows a NORMALLY OPEN
switch to control a NORMALLY CLOSED relay output without external circuitry.
( A-15)
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