External Event within scan

That function is the possibility, to get an external signal, given to the input of the LMS, into the the scan data telegram, including the information of the time when the signal occured, and the angular degree of the mirror at the same point.
The Event information can be found than in the event block of the data telegram.
That external signal can be any sort of signal, a GPS signal, an external trigger signal, a cyclic impulse or similar...

 

The LMS5xx (PRO only) may monitor the state of IN4. A low to high transition of that external signal marks an "event". An event contains a description of the time and position (of the internal mirror) within the scan. Up to three events per scan can be acquired. They are saved within the scan´s event block:
\aEventBlock[0..2] 
udiSystemCount timestamp when event occurred [us] 
diAngle angle at which event occurred [1/10000°]

 

In order to have the events included, Input 3 and 4 must be configured as "Digital Input". The external signal must be connected to Input 4 (same input as sync signal). For the external signal the configuration of Input 4 is not relevant: It triggers on low to high transition only and does not debounce the signal!

 

At 185° the scan will be finished, the events written into the data telegram and then the telegram is sent.
At 186° a new scan starts, than again, 3 external external are possible.

 

 

Please consider that the simultaneous operation of an external incremental Encoder and external Signal is not possible. The order of events within the data structure is "newest" first. A maximum of three events can be evaluated within one scan, i.e. the last three events within a scan are collected. Also note that event collection starts just after the active scan range of the previous scan, i.e. at the 185° angle.
Works only with the LMS 5xx PRO.

 

Four events occur within a scan, evenly spaced by 90°.

Description from the Developers Guide:

 

Example with 1 Event in a scan:

sSN LMDscandata
 0 1 D5EF4F 0 0
970D 982B 303CCB
DA 303D15AF 8 0 
3F 0 0 1388 168 
0 1 DIST1 400000
00 00000000 D6D8
0 1388 5 34C 349
 34B 349 346 0 0
 1 B SN 14020431
 0 1 7E4 6 8 C 1
C 12 5EF88 1 FDI
N 0 303CD559 3AC
1B

Example with 2 Events in a Scan:

sSN LMDscandata
 0 1 D5EF4F 0 0
D3A3 D4C1 42C154
D5 42C19EB7 8 0 
3F 0 0 1388 168 
0 1 DIST1 400000
00 00000000 D6D8
0 1388 5 348 343
 344 348 347 0 0
 1 B SN 14020431
 0 1 7E4 6 8 C 2
1 1D F618 2 FDIN
 0 42C15A44 CE77
 FDIN 0 42C15A1A
 B264

At the Moment is no additional parameterization necessary.