Pepperl+Fuchs IRI-KHA6-4.RX, Руководство пользователя

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IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Commands
Zumutbare Änderungen aufgrund technischer Verbesserungen vorbehalten. Copyright Fuchs, Printed in Germany
Fuchs GmbH • 68301 Mannheim • Telefon (06 21) 7 76-11 11 • Telefax (06 21) 7 76-27-11 11 • Internet http://www.pepperl-fuchs.com
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6 Commands
The system responds to commands given via the serial interface. All commands con-
sist of several ASCII characters and include the mode, read head number and data
format but the read number and the data format may be omitted. In this case, either
the previously selected values or the default settings are used. A comma must be in-
serted between the read head number and the data format. All commands are, as a
general principe, terminated with the carriage return (<CR>) and line feed (<LF>) but
these may be left out. It is of no consequence whether upper case or lower case let-
ters are used for the commands.
Command structure:
Command explanations:
Com<RHn>,<DF> Com: Command mode
RHn: Read head number (optional)
DF: Data format (optional)
Command mode Explanation
R Read mode
The read head performs a single read operation. The control
interface issues the code or sends an error message if no
code carrier was present.
AR Autoread mode
The read head repeatedly performs read operations. This will
continue until a code carrier comes within range of the read
head. At this point the control interface issues the code and
the read head stops reading. This mode can be interrupted
by the input of a new command.
CAR Continuous autoread mode
This mode is equivalent to the AR mode in that the code car-
rier is read and the code returned. Thereafter the command
remains active, i.e. the code carrier is read again and the
code transmitted etc.
BAR Buffered autoread mode
In the continuous autoread mode, if a code carrier is stanion-
ary in front of a read head, its code is constantly read and
transmitted. Since all these codes must be processed by the
control system, overloading may occur. To remedy this, the
BAR command has been created by which a code is trans-
mitted only once. This when a new code is identified or, if
repeated attempts fail to read a code, a further code is sent.
It must be realized that in an environment subject to strong
interference, even though a code is sent repeatedly, it may
eventually not be identified for a short period which will result
in it being transmitted as a new code.