CIRCUTOR ReadWatt Series - Manual (Page 13)

4�- OPERATION
ReadWatt reads the light impulses from the meter, whose value is shown in real time on a
MODBUS parameter, which can be queried by another application.
The unit reads kWh consumed or generated and totalizes them in the MODBUS meter, which
works incrementally, being able to generate, for example, a load curve in external software.
4.1.- IMPULSE LED
The unit has an impulse LED with the same rate as the LED on which impulses are captured.
This safeguards the functionality of the meter's LED.
This LED has the same metrological validity as the meter's LED.
LED
Figure 8:Readwatt LED indicators
During start-up, the LED indicates the speed of the communication bus, by emitting 1, 2 or 3
light impulses, see Table 3 .
Table 3: Communication bus speed�
No� of pulses Speed
1 9600 bauds
2 19200 bauds
3 38400 bauds
4.2.-
IMPULSE OUTPUT
The unit has a transistor output (terminal no. 7 in Table 2 ) to activate PLC or similar inputs.
Through MODBUS it is possible to configure the impulse width and ratio between output im-
pulses and impulses read from the energy meter verification LED.
13 Instruction Manual
ReadWatt