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5-2 Transmission speed (baud rate)
5-2 Transmission speed (baud rate)
The baud rate can be set by DIP switch 2 and 3.
The baud rate must be set both on the receiver bar dip-switches as well as the transmitter bar
dip-switches to align the timing synchronism of the two bars.
5-3 Beam aquisition and data aquisition
5
In order to understand the functions of F3EM2 and to choose the right operation mode it is
important to differentiate:
Beam acquisition = Conditions of beams checked at one scanning cycle of the light curtain.
Data acquisition = Sum of beam acquisitions gathered in the time frame between 2 external
interrogations.
The light curtain saves the beam acquisition made at each scanning cycle and executes a
logical "OR" between the status of new acquired beams and the previous one.
See an example of a data acquisition resulting from two beam acquisitions:
Triggered by an interrogation code the light curtain sends the acquired data and cleans the
beam status memory again.
In practice this process enables for example the measuring of the maximum height of an
irregular shaped object that is moving through the light curtain. Thus only the relevant
information is transmitted.
Because the beams are scanned sequentially it can occur that a command or trigger arrives
before the scan is completed. In this case the scan is interrupted and the status of the scan
before is transferred in the response protocol.
Note:F3EM2 also provides continuous bitmap transmission. In this mode the light curtain continuously
5-4
RS baud rate
2
3
OFF
OFF
9600bps (default)
OFF
ON
ON
OFF
ON
ON
Precautions for Correct Use
1
0
0
0
0
1
1
0
0
1
0
1
0
0
1
0
sends each beam acquisition to the host / PLC. In this case however the host has to process a much
higher amount of data.
F3EM2 MEASURING LIGHT CURTAINS OPERATION MANUAL
Speed
19200bps
38400bps
76800bps
1
0
0
Previous beam acq.
0
1
0
1
Last beam acq.
1
1
0
1
Data ready to be sent
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