Optical MICROMETER, RF656 Series - RIFTEK - #9

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Laser Optical Micrometer, RF656 Series 10. Configuration parameters. The nature of operation of the micrometer depends on its configuration parameters (operation modes), which can be changed only by transmission of commands through serial port RS232 or RS485. The basic parameters are as follows: 10.1. Sampling mode. 9 This parameter specifies one of the two result sampling options in the case where the micrometer works in the data stream mode: Time Sampling; Trigger Sampling. With Time Sampling selected, the micrometer automatically transmits the measurement result via serial interface in accordance with selected time interval (sampling period). With Trigger sampling is selected, the micrometer transmits the measurement result when external synchronization input (IN input of the sensor) is switched and taking the division factor set into account. 10.2. Sampling period. If the Time Sampling mode is selected, the ‗sampling period‘ parameter determines the time interval in which the sensor will automatically transmit the measurement result. The time interval value is set in increments of 0.01 ms. For example, for the parameter value equal to 100, data are transmitted through bit-serial interface with a period of 0,01*100 = 1 ms. If the Trigger Sampling mode is selected, the ‗sampling period‘ parameter determines the division factor for the external synchronization input. For example, for the parameter value equal to 100, data are transmitted through bit-serial interface when each 100th synchronizing pulse arrives at IN input of the micrometer. Note 1. It should be noted that the ‗sampling mode‘ and ‗sampling period‘ parameters control only the transmission of data. The micrometer operation algorithm is so built that measurements are taken at a maximum possible rate determined by the integration time period, the measurement results is sent to buffer and stored therein until a new result arrives. The above-mentioned parameters determine the method of the readout of the result form the buffer. Note 2. If the bit-serial interface is used to receive the result, the time required for data transmission at selected data transmission rate should be taken into account in the case where small sampling period intervals are used. If the transmission time exceeds the sampling period, it is this time that will determine the data transmission rate. Note 3. It should be taken into account that micrometers differ from other devices by some parameters‘ dispersion of internal generator that influences on accuracy of time sampling period 10.3. Number of averaged values/time of averaging. This parameter specifies the number of source results to be averaged for deriving the output value or time of the averaging . The use of averaging makes it possible to reduce the output noise and increase the sensor resolution. Averaging over a number of results does not affect the data update in the sensor output buffer. RF656 [Revision 3.0] 10th October 2011