IDEC DS2_Series - Manual (Page 13)

DS2 series Instruction manual
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5.5. RS485 serial output setting
Serial output data updating is usually made at the end of each scanning cycle. This conditions
enormously the response time, as it is depends on the serial baud-rate, data structure and information
detail that has to be transmitted on the serial output for the application. Some serial configuration
commands have been added to make the device flexible to different applications. The remote user
interface completely controls these commands.
• Baud-rate: allows the change of the serial switching speed. The 485 standard guarantees
excellent disturbance immunity and thus the increase of the transmission speed may compromise
the system. The speed has to be evaluated according to the application, plant and cabling.
• Transmission standard selection: the ASCII or Binary data structure transmitted by the serial
output can be selected; in applications where time is important, the binary structure is preferred.
For details concerning data transmission please see section 7 “Communication protocol”.
• Data partition selection: allows a partial serial data transmission. In particular, the transmission of
the complete beam status array or partial beam status array is distinguished: The two conditions
exclude each other (one or the other). If the partial transmission is selected, one of the
aforementioned measurement modes has to be chosen. Partial transmission is preferred for
applications where time factors are important. Further partial transmission is short protocol which
transmission is purely binary and extremely fast. Fuction is enable for single measure only.
For data transmission details please see section 7 “Communication protocol”.
• Data sending mode selection: function allows the operator to choose when to send the data from
the serial output. The sending can also be inhibited by a specific selection (via “software”, using the
specific command, via “hardware” programming the serial output enable input – pin 5 RX
connector – using the user interface). The sending mode selection can be reached only via remote
control. Four options can be selected: data sending at each machine cycle which is the default
setting, data sending at each output status change, data sending at analogue output value
change, user sending request, using the interface command button. This last condition can be
requested also by an external command previously programming the device (per details please see
section 7 “Communication protocol”).
6. FUNCTION AND PROGRAMMING SELECTION
The functions implemented in the AREAscan TM DS2 light grids can be selected
using the dip-switches present on the device receiving unit or via remote.
The default configurations are given below:
• Default configuration for receiver unit
The device is supplied with the standard configuration shown in the figure:
• Default configuration for emitter unit
The device is supplied with the maximum emission adjustment setting (minimum sensitivity)
• Sensitivity adjustment
Sensitivity adjustment is made using the trimmer located inside the
emitter unit lid. This function allows the operator to change the
emitter intensity.