IDENT-I • IVI-KHA6-4HRX, IVI-KHD2-4HRX
Commands
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
epperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
Date of issue 27.08.2001
16
6.1.2 Command structure
Cmd<HdNo><,DF>
Cmd: Command mode
HdNo: Read-head number (optional)
DF: Data format (optional)
The inputs <HdNo> and <DF> are optional. If these parameters are not entered, the
last valid setting will be used.
6.1.3 Command description
The command mode is followed by the number of the read head (1, 2, 3, or 4). If an
X is transmitted instead of the read head number, all connected read heads are inter-
rogated in succession. The code is read and transmitted followed by the number of
the read head (R mode). In AR mode, reading continues until a code carrier can be
read. In CAR mode, all the connected read heads read continuously until a new com-
mand is entered.
After power-on, read head 1 is selected. If no read head number is specified, the pre-
viously selected head remains valid. Selecting read head 0 disables all read heads.
This is useful when energy consumption needs to be kept to the minimum.
Command Description
R Read mode
The read head reads the code once. The control interface unit trans-
mits the code or transmits an error message if it is unable to read a
code carrier.
AR Autoread mode
The read head reads continuously until a code carrier is available.
The code is then output. This mode can be cancelled by entering a
new command.
CAR Continuous Autoread mode
This mode corresponds to the AR mode. The code carrier is read and
the code is output. The command then remains active, i.e. the code
carrier is read again and the code transmitted etc.
BAR Buffered Autoread mode
In Continuous Autoread mode, a code carrier in front of a read head
is continuously read and its code is transmitted. Since all these codes
have to be processed by the higher-level control system, this can
lead to an overload. A solution is provided by use of the command
BAR, which causes a code to be transmitted once only. Only when a
new code is identified or when the system repeatedly fails to read a
code, will a further code be transmitted.
Note that in a high-interference environment, a code may be transmit-
ted a number of times, since it may be temporarily unrecognizable due
to interference and then transmitted again as a new code.
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