Ritron DATAFLOW RTU Series Guide de l'utilisateur télécharger pdf (Page 30)

DATAFLOW RTU

>>> RTU PROGRAMMER VERSION 3.03 960724 HELP FILE <<<

1.0 RTU System Configuration Screen:

The system configuration screen provides an area for the user to configure

system parameters, send list, repeat list, and fail-safe states. It allows access to

RTU configuration and disk files. It also provides access to the input/output

configuration and the SCADA configuration.

1.1 System Parameters:

The frequency must be the same for all RTUs in a system. The frequency must

be a multiple of the channel spacing. The standard channel spacing for UHF

channels (RTU-450s) is 12.5kHz. VHF radios (RTU-150s) may operate at

either 5 kHz or 12.5 kHz channel spacing. UHF RTUs can be programmed to

operate on either high or low power. High power is approximately 5 Watts. Low

power is approximately 2 Watts. VHF RTUs can only operate on high power.

The ID must be unique for each RTU in the system. Other MODBUS devices in

the system must each also have a unique ID. All RTUs which communicate together

must have the same group number. For version 3.27 firmware, the group is limited to 1.

Multiple groups will be supported in a later version of the firmware.

Each RTU can send periodic status messages that are not triggered by a change

on the inputs. The time between these periodic check-ins is variable from 1 second

to 48 days. A check-in time of zero indicates that the periodic check-in is not used,

and messages will be sent on input change only. The check-in interval must be larger

than the number of message attempts times the transmit time (about 180 ms) plus the

listen time. If an acknowledge is not received, the sending RTU tries to send the

message again until the number of message attempts has been exhausted. If, at the

end of these attempts, an acknowledge has not been received, the unit will set its

fail-safe condition.

Some of the variables particular to the radio operation of the RTU are displayed on

the System configuration screen. These values include the carrier detect level, back-off

time, cold start time, and attack time. These values are preset and should not be altered

without consultation with the factory.

The serial port baud rate is selectable between 1200, 2400, 4800, and 9600. Version 3.0

software locks the baud rate at 9600 baud. The radio communicates at a constant 1200

baud. This RF data rate is not selectable.

The RTU can be programmed to operate in sleep mode. In this mode, the RTU acts

as an input device only. The RTUs radio receiver is turned off during normal operation.

The RTU transmits only on status change or at a set check-in interval. After message

transmission, the RTU turns on the receiver and waits for an acknowledge. It then turns

off the receiver and goes back to sleep. The maximum time that the sleeping units

receiver stays on is equal to the awake time.

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Ritron DATAFLOW RTU Series Guide de l'utilisateur Page 30