I n s t a l l a t i o n
12
S
I
C
K
O
p
t
i
c
-
E
l
e
c
t
r
o
n
i
c
B
a
r
C
o
d
e
S
c
a
n
n
e
r
s
2
Figure 2-6 Daisy Chain Configuration via CLV Host Port
DAISY CHAIN CONFIGURATION
This configuration allows connection of several scanners to one interface port of the host device. There are two modes of opera-
tion in this configuration: master/slave or pass-through. There should be no more than 8 scanners used in these modes. Refer to
Figure 2-6 for an illustration of a daisy chain configuration.
Master/Slave Mode
For guidance in operating the scanners in the master/slave mode, refer to page 39.
Pass-Through Mode
In this mode of operation, the data from one scanner is passed to the next scanner in line and this is passed on again, etc. The
last scanner in line then transmits the data to the host device.
There is no time delay in this mode of operation, since each scanner provides a virtual connection.
The procedure required to activate this mode includes conditioning the output of each scanner to contain <STX>/“Data” <ETX>.
The “/” (forward slash) character is entered into the first position of the “Header” section.
The CLV uses the variable protocol framing <STX> and <ETX> characters which are selected in the Host Interface: Protocol sec-
tion. The forward slash is a special character to indicate the pass-through mode. Thus, the CLV receives the information and
immediately transmits the data to the host or to the next scanner in line.
2 Modes of Operation:
* Pass-Through Mode
* Master/Slave Mode
HOST DEVICE
DISTRIBUTION
UNIT
CLV
(master)
CLV
CLV
T-
R-
T-
R+
T+
T+
DISTRIBUTION
UNIT
T-
T+
R+
R-
DISTRIBUTION
UNIT
T-
T+
R+
R-
R-
R+
HOST DEVICE
DISTRIBUTION
UNIT
CLV
(master)
CLV
CLV
TxD
RxD
TxD
DISTRIBUTION
UNIT
TxD
RxD
DISTRIBUTION
UNIT
TxD
RxD
RxD
RS 232
RS 422
2 Modes of Operation:
* Pass-Through Mode
* Master/Slave Mode