Operating Instructions
Chapter
8
CLV 490 Bar Code Scanner
8 008 796/0000/25-06-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8-11
Troubleshooting
8.5.2
Malfunctions in Reading mode: reading trigger errors
¾
Check whether the "Device Ready" LED lights up.
If the LED does not light, see
.
Malfunction
Possible cause
Remedy
1. Trigger mode:
Sensor input
(external sensor).
The CLV cannot be clocked:
– the "Sensor" LED does not
light up
– the scan lines don’t
appear
•
Sensor not connected or connected to
incorrect switching input.
•
If sensor supplied by CLV: sensor not
connected to ground potential
•
Incorrect reading pulse source para-
meterized in the CLV
•
Photoelectric switch not aligned with the
reflector (photoelectric proximity switch/
inductive sensor not dampened)
•
Connect sensor to "Sensor" switching
input. Check sensor wiring (see
). Measure output signal on
sensor.
•
Insert jumper between pin 5 and pin 15
•
In the "CLV-Setup" program: choose the
D
EVICE
C
ONFIGURATION
tab, R
EADING
T
RIG
-
GER
Mode section: Sensor input select-
ed? (active high: reading pulse starts
when power applied)
•
Align sensor.
Check functioning
2. Trigger mode:
Serial interface
The CLV cannot be clocked:
– the Sensor LED does not light up
– the scan line does not appear
•
Incorrect reading pulse source para-
meterized on the CLV
•
The CLV is not receiving any command
strings to start the reading interval on the
data interface
•
In the "CLV-Setup" program: choose the
D
EVICE
C
ONFIGURATION
tab, R
EADING
T
RIG
-
GER
Mode section: is serial interface se-
lected? S
ERIAL
I
NTERFACE
section: is
trigger type correct?
•
Check data connection to host. In the
"CLV-Setup" program: choose the H
OST
I
NTERFACE
tab.
In D
ATA
F
ORMAT
section: are the correct
interface type (hardware) and data for-
mat selected?
I
NTERFACE
P
ROTOCOL
section: are the cor-
rect start and stop characters selected?
Use the "CLV-Setup" program to check
the host command strings: choose
A
UXILIARY
I
NTERFACE
tab. Choose
M
ONITOR
H
OST
I
NTERFACE
function.
See
Chapter 6.5.8 Monitor Host Inter-
.
Download temporarily to the CLV.
3. CLV does not respond to an
external signal that ends the reading
pulse (sensor input, serial interface)
Incorrect end of reading pulse para-
meterized on the CLV
In the "CLV-Setup" program:
choose the D
EVICE
CONFIGURATION
tab, click
the E
DIT
READING
T
RIGGER
button.
E
ND
OF
R
EADING
I
NTERVAL
section: is generat-
ed by Trigger Source selected?
Table 8-6: Troubleshooting: reading trigger errors in Reading mode