Operating Instructions
Chapter
10
CLV 490 Bar Code Scanner
8 009 993/O824/20-12-2004
©
SICK AG · Division Auto Ident · Germany · All rights reserved
10-35
Appendix
10.3.1
Function of the external parameter memory
When it is started, the CLV is initialized with the data stored in its internal parameter set
(EEPROM). If this parameter set has been copied to an external memory, the device can be
replaced easily. The replacement device, therefore, does not have to be configured manu-
ally. Instead, it accesses the external parameter memory automatically (assuming that the
correct start option has been selected). It then imports the parameter set to its RAM. This
option ("Start with external parameters...") is set by default. The "Device Ready" and "Read
Result" LEDs indicate whether the external memory was accessed successfully. The CLV
also outputs messages for troubleshooting purposes on the terminal interface.
Note
If the CLV and an external parameter memory in the connector cover are connected toge-
ther to a
CDB 420 or CDM 490 Connection Module
containing also an external parameter
memory provided by the
CMC 400
, the CLV will detected both external parameter memo-
ries. Before starting the reading mode, the CLV will operated as followed:
•
If the memory of the CMC 400 comprises a
parameter set compatible with the CLV
,
the CLV loads this parameter set into the RAM and into its internal EEPROM. The "De-
vice Ready" LED of the CLV blinks 20 times and then lights up constantly. Then the CLV
clears the parameter memory in the connector cover.
In CLV-Setup, the external parameter memory in the connector cover is not longer
available.
•
If the memory of the CMC 400 comprises a
parameter set not compatible with the
CLV
, the CLV loads the internal parameter set from its in EEPROM into the RAM. The
CLV clears the parameter memory in the connector cover. In CLV-Setup, the external
parameter memory in the connector cover is not longer available.
•
If the memory of the
CMC 400 is empty
, the CLV copies the internal parameter set
from its EEPROM via the RAM to the CMC 400 if write protection is disabled ("Write Pro-
tection" switch of the CMC 400 in top position). The "Device Ready" of the CLV blinks
20 times alternately with the "Read Result" LED, then the "Device Ready" LED ligths up
constantly.
If write protection for the CMC 400 is enabled, the CLV loads the internal parameter set
from its in EEPROM into the RAM. The "Device Ready" and "Read Result" blink constant-
ly together. In both cases, the CLV clears the parameter memory in the connector cover.
In CLV-Setup, the external parameter memory in the connector cover is not longer
available.
The CLV supports the CMC 400 from firmware V 3.30 on.
If necessary, the memory of the CMC 400 can be manually deleted.
To do so using CLV-Setup, choose C
LEAR
CMC 400 under CLV 490 in the menu bar.
2 031 034
as 2 030 065, but with longer cables
With
heater
10 m
(32.8 ft)
CLV to CDM 490
2 027 543
Connector cover, two connection cables ending on a second
connector cover (
with
wires for CAN interface1 ).
Pin assignment see
Chapter 5.3 Connector pin assignment,
With
heater
3 m
(9.84 ft)
CLV to AMV 100/200
Order no.
Design
CLV
Length
Connection
Table 10-4: Types of the external parameter memory in the connector cover (contd.)