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IDENT-I • IVI-KHA6-4HRX, IVI-KHD2-4HRX
Commands
6.2.2 Command structure
Read/write commands have a "Single" mode corresponding to the "Read" mode in the
fixed code system, and an "Auto" mode, corresponding to the "Auto-Read" mode in
the fixed code system. The distinction between these modes is made not by another
command, but by the use of upper or lower case text in the command header.
When "x" or "X" is transmitted as the read head number in a command, the command
will apply to all the connected read heads. In the case of 'Read' commands, all con-
nected heads are interrogated, and the data from all detected data carriers will be
transmitted. To enable the data received to be linked with the relevant head, the head
number is inserted in each reply string after the status message. If more than one data
carrier is detected in a read cycle, a separate reply string, terminated with the ETX
character, will be transmitted for each code that is read.
Example:
Command:
Response, read head No. (HdNo) 1 ... 4:
Response, read head No. (HdNo) x:
In the case of 'Write' commands, the data is written to the first data carrier detected.
The head number of the corresponding head is transmitted between the status mes-
sage and the check sum.
Example:
Command:
Response, read head No. (HdNo) 1 ... 4:
Response, read head No. (HdNo) x:
Key to abbreviations:
HdNo
HdNoA
DT
PNo
Subject to reasonable modifications due to technical advances.
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Head number (0 ... 4, x or X), 1 ASCII character. Entering 0 disables
all heads. Entering "x" as the number will cause all heads to be in-
terrogated in rotation.
Head number (1 ... 4) in the reply to an "X" command, 1 ASCII cha-
racter.
Data carrier type (1, 3, or 4), 1 ASCII character. See chapt.6.2.4
Page number, 3 ASCII characters; page numbering for:
IDC - ... -1K:
(000 ... 003)
IMC-40-64K:
(000 ... 0FF)
IMC-40-256K:
(000 ... 3FF)
a <HdNo><CHCK><ETX>
a <Status><DB><CHCK><ETX>
a<Status><HdNoA><DB><CHCK>
<ETX>
<HdNo><StAdrH><BytesH><DB>
<CHCK><ETX>
K <Status><CHCK><ETX>
K <Status><HdNoA><CHCK><ETX>
4 pages of 256 bits each
256 pages of 256 bits each
1024 pages of 256 bits each
Copyright Pepperl+Fuchs, Printed in Germany
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