Ritron DATAFLOW RTU Series Guide de l'utilisateur télécharger pdf (Page 21)

DATAFLOW RTU

( A-15 )

15.5.3 The following calculations apply to RTU-BATNICD, using a 14V source.

R1 = (14 - 0.4 - 12) / .05 = 32 W

PR1 = (14 - 0.4 - 8)

/ R1 = 0.98 W

15.5.4 For RTU-BATHOLD, use a rechargeable battery type. Confirm the manufacturers specification for full

charge voltage, empty voltage, and trickle charge current.

16.

SERIAL LINK

16.1 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 MODBUS RTU Protocol. The baud rate of this link is programmable between 1200, 2400,

4800, and 9600 BPS.

17. I/O MAPPING

17.1 I/O 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. DIGITAL INPUTS

18.1 The (up to) six digital inputs are 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 be obtained by letting 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.

You can invert the input state of an RTU unit, which will cause a DATAFLOW RTU reading a switch as

HIGH to transmit the switch status as LOW to another DATAFLOW RTU. Inversion allows a NORMALLY

OPEN switch to control a NORMALLY CLOSED relay output without external circuitry.

PARAMETER MINIMUM MAXIMUM

HIGH programmable V 5 V

programmable kΩ infinite Ω

LOW 0 V programmable V

0 Ω programmable kΩ

ABSOLUTE LIMITS -2 V 7 V

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 62 63

Pas de commentaire

Ritron DATAFLOW RTU Series Guide de l'utilisateur Page 21