03-09-05 22
Signal leads with demand for twisted pairs
Interface Pin number
RxD - GND (RS232) 1, 11
TxD - GND (RS232) 9, 11
CLOCK - CLOCK-inverse 3, 4
DATA - DATA-inverse 5, 6
Rx+ - Rx- (RS422) 3, 4
Tx+ - Tx- (RS422) 5, 6
Signal leads without demand for twisted pairs
Signal lead Pin number
Analog out (Current source) 13
Laser ON +24VDC (+5 - +32
VDC)
14
Invalid out+ (optocoupled) 12
Invalid out- (optocoupled) 8
Power supply leads
Main power. The power supply leads should be dimensioned so that the voltage
between pin 15 (+24VDC) and pin 11 (GND) never falls below 18 VDC. For a 24
VDC power source this means that the total resistance in the power and ground leads
must not exceed 15 ohms.
Laser ON (control input). Pin 14 must be held at +24 VDC (+5 - +32 VDC) to enable
the laser.
Cable screening
The cable shall include a screen connected to GND at the ”sensor end” of the cable.
Analog output
General considerations
The analog current output of the SLS5/6000 sensors is derived from the same high
performance and accuracy digital distance data as available over the Selcom
Serial, RS232 and RS422 interfaces.
The digital information has passed through a high performance digital to analog
current converter supplying an easy to acquire signal form for many industrial
users and processes.
As a complement to the analog output, an ”Invalid out” signal is available. The
sensors are available in two versions (factory set, not to be changed by the user!)
regarding the state of the analog output when data is considered ”invalid”:
”Hold latest valid” i.e. the analog output current is held at the latest valid D/A
converted data value.
”Zero out on invalid” is only available with 4-20 mA output i.e. the analog
current output is set to 0 mA as long as data is considered invalid.
Scale factor current output and engineering units
IMPORTANT: The transformation of the current output to engineering units (i.e.
mm, inches etc.) in a control computer, PLC etc. requires the use of a ”scale factor
(SF
I
)” that defines the relation between current output and engineering unit. For a
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