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Operation
optoNCDT 2300
6.3 Programming via ASCII Commands
As an added feature you can program the sensor via an ASCII interface, physically RS422 and / or Ethernet. This requires, that the
sensor must be connected either to a serial RS422 interface via a suitable interface converter, see Chap. A 1, or a plug-in-card to a PC
/ PLC. In addition, the Ethernet interface can be used via a suitable program, for example Telnet.
Pay attention in the programs used to the correct RS422 default setting or a valid Ethernet address.
Once connected, you can transfer the commands from the appendix, see Chap. A 6, via the terminal or Telnet to the sensor.
6.4 Timing, Measurement Value Flux
The sensor operates internally with real time cycles in a pipeline mode:
The sensor requires 5 cycles for measuring and processing without triggering.
1. Exposure: Charging the image detector in the receiver (measurement),
2. Reading: Reading out of the imaging device and converting into digital data,
3. Computing (2 cycles),
4. Synchronous output.
Each cycle takes about 20 µs at a measuring rate of 49.140 kHz. The measured value N is available after each cycle with a constant
lag of 5 cycles in respect to the real time event. The delay time between detection and start of outputs is therefore 100 µs. The pro-
cessing of the cycles occurs sequentially in time and parallel in space (pipelining). This guarantees a constant real time data stream. A
measured value delayed by 5 cycles is output for each measurement cycle.
Averaging the measured values has no effect on the time behavior. Remember, however, that the sensor needs time for the averaging,
until measured values are present according to the set averaging number N. Depending on the nature of the averaging value and the
number of averaged values, there are different settling times.
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