Pepperl+Fuchs IRI-KHD2-4.RX User manual

FACTORY AUTOMATION
MANUAL
IRI-KHD2-4.RX / IRI-KHA6-4.RX
CONTROL INTERFACE UNIT
FOR 4 READ HEADS

With regard to the supply of products, the current issue of the following document is applicable:
The General Terms of Delivery for Products and Services of the Electrical Industry, as published by
the Central Association of the 'Elektrotechnik und Elektroindustrie (ZVEI) e.V.',
including the supplementary clause "Extended reservation of title"
We at Pepperl+Fuchs recognise a duty to make a contribution to the future.
For this reason, this printed matter is produced on paper bleached without the use of chlorine.

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Table of Contents
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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. 02 2002
1
Table of Contents
1 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3.1 Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 General safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Functional safety/monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
5 Serial interface/DIP switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5.1 RS 232 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 RS 422 and RS 485 interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3 20 mA current loop or TTY interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.4 Connection cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
6.1 Read head number RHn. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2 Data formats DF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.3 Error messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.4 Example of a program written in Basic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
7.1 General specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.2 Connection diagram AND TERMINAL ASSIGNMENTS . . . . . . . . . . . . . . . . . . . . . . . . 22
7.3 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8 Operating control interface units using the 3964R protocol . . . . . . .25
8.1 Notes on the 3964R protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.1.1 Byte description: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.1.2 Handshake procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.1.3 Basic structure of all messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1.4 Data exchange via FETCH messages involving 3964R with RK512 . . . . . . . . . . . 28
8.1.5 Data exchange via 3964R with RK512 involving SEND messages . . . . . . . . . . . . 30
8.1.6 Data exchange without the RK512 Interpreter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.2 Command interpreter, systems for fixed code and read/write commands. . . 31
8.2.1 Command structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2.2 Mode commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2.3 Read commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.2.4 Admissible Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.3 Error and status messages when using the 3964R protocol . . . . . . . . . . . . . . 35
9 ASCII Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Table of Contents
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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. 02 2002
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IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Declaration of Conformity
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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 27.02.2002
3
1 Declaration of Conformity
The Control interfaces IRI-KHD2-4.RX and IRI-KHA6-4.RX have been developed and
produced in accordance with the applicable European standards and directives.
The manufacturer of the product, Pepperl+Fuchs GmbH in D-68301 Mannheim, pos-
sesses a certified quality assurance system in accordance with ISO 9001.
A corresponding declaration of conformity can be requested from the
manufacturer.
ISO9001

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Declaration of Conformity
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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 27.02.2002
4

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
General information
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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 27.02.2002
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2 General information
This symbol warns the user of possible danger. Failure to heed this
warning can lead to personal injury or death and/or damage to equip-
ment.
This symbol warns the user of a possible failure. Failure to heed this
warning can lead to total failure of the equipment or any other connec-
ted equipment.
This symbol gives the user important hints.

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
General information
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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 27.02.2002
6

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Safety
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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 27.02.2002
7
3 Safety
3.1 Intended Use
The control interface units IRI-KHD2-4.RX, IRI-KHA6-4.RX serve as part of the induc-
tive identification system IDENT-I from Pepperl+Fuchs to connect to a high order
computer (PLC, PC) with the PROFIBUS-DP interface (DIN 19245 T1 + T2,
EN 50170).The control interface units are only to be used with the read/write heads
and the code/data carriers from Pepperl+Fuchs.
3.2 General safety information
3.3 Functional safety/monitoring
The control interface units IRI-KHD2-4.RX, IRI-KHA6-4.RX operate on a micropro-
cessor basis. Functional disturbances and equipment errors/faults are signalled with
the LED "Run/Error" on the front of the device.
In addition function control via the PROFIBUS is possible by interrogating the diagno-
sis/status information. Device failure or breakdown of a read head can be detected
and indicated by the master unit.
The protection of operating personnel and the system against possible
danger is not guaranteed if the control interface unit is not operated in
accordance with its intended use.
The devices IRI-KHD2-4.RX, IRI-KHA6-4.RX may only be operated by
appropriately qualified personnel in accordance with this operating
manual.
Safety and correct functioning of the device cannot be guaranteed if any
operation other than that described in this operating manual is per-
formed.
The connection of the equipment and any maintenance work to be car-
ried out with voltage applied to the equipment must only be performed
by appropriately qualified electro-technical personnel.
In the case that a failure cannot be repaired, the device must be taken
out of operation and protected against inadvertently being put back into
operation.
Repair work may only be carried out by the manufacturer. Additions or
modifications to the equipment are not allowed and void the warranty.
The responsibility for the observance to local safety standards lies with
the operator.

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Safety
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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 27.02.2002
8

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Installation
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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. 02 .2002
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4 Installation
Code carriers with ferrite core can be mounted embeddable in steel (see data sheets).
The surface with the Pepper+Fuchs logo must point towards the read head and must
be installed "face-on" or raised. Only this way, a safe operation is ensured.
Flush mounting in metal reduce the read distance.
Versions with mounting links are available.
The read distances and the maximum misalignment from the read axis are depending
on the used code carrier (see data sheets).
Up to 4 read heads can be connected to the control interface. The control interface is
connected to the computer via a serial interface.
The code carriers should not be mounted recessed in metal, as the
read distances could be impaired.
The read heads must not be mounted embeddable in metal.
The maximum transmission rate is depending on the read distance.

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Installation
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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. 02 .2002
10

IDENT-I • IRI-KHA6-4.RX, IRI-KHD2-4.RX
Serial interface/DIP switches
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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 27.02.2002
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5 Serial interface/DIP switches
The RS 232 serial interface is connected via the built-in 9-pin sub-D-connector. Alter-
natively, RS 422, RS 485 or 20 mA interfaces can be connected to the housing termi-
nals.
The interface standard is selected by setting DIP switches S7 and S8 located on the
upper face of control interface.
Since the control interface unit incorporates only one serial interface, which operates
with different drivers and receivers for the various standards, then only one standard
interface may be connected at any one time.
The transmission rate (baud rate) is set with DIP switches S1, S2 and S3 as follows:
Data is transmitted using one start bit, 8 data bits, one stop bit and no parity bit. The
control interface unit also responds to one-and-a-half and two stop bits.
In the basic fixed-code operating mode, the following data formats are possible:
8 data bits, no parity
7 data bits, even parity
7 data bits, odd parity
To set these transmission formats, the command RST (in upper or lower case, but not
in combination) must be sent to the control interface unit immediately after power on.
The control interface unit adjusts automatically to the required format.
In binary mode, the number of data bits to be transmitted is always 8. If 7 data bits are
set, the control interface unit will return the error message “M5” in response to the
command “SB”.
Standard S7 S8
RS 232 / RS 485 open open
RS 232 / RS 422 open close
20 mA-current loop close open
Transmission rate S1 S2 S3
300 Bd open open open
600 Bd open open close
1 200 Bd open close open
2 400 Bd open close close
4 800 Bd close open open
9 600 Bd close open close
19 200 Bd close close open
not defined close close close

IDENT-I • IRI-KHA6-4.RX, IRI-KHD2-4.RX
Serial interface/DIP switches
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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
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5.1 RS 232 Interface
The RS 232 interface connections are routed to the 9-pin sub-D-connector as follows:
Bild 5.1: 9-pin Sub-D-connector with pin connection
The cable for connection to a PC should be as follows:
Bild 5.2: Connection cables PC
Data signal input RxD Pin 2
Data signal output TxD Pin 3
Clear to send input CTS Pin 8
Request to send output RTS Pin 7
Ground GND Pin 5
12345
6789
RTS CTS
GND
TxD
RxD
RxD RxD
RTS RTS
TxD TxD
CTS CTS
GND GND
Shield

IDENT-I • IRI-KHA6-4.RX, IRI-KHD2-4.RX
Serial interface/DIP switches
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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
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5.2 RS 422 and RS 485 interfaces
With these two standards, the data signal is defined as the voltage differential be-
tween two conductors. Since possible interferences have the same effect on both
conductors, provided a tightly twisted pair is used, a more secure data transmission
is obtained than with the RS 232 interface, particularly at high transmission rates.
The RS 422 standard provides a symmetrical four-wire connection that is insensitive
to interference. The transmit and receive lines are separate, so that full duplex oper-
ation is possible.
With the RS 485 standard, the transmit and receive lines are coupled, permitting half-
duplex operation only. The transmitter is disabled to allow the receipt of data. The abil-
ity of multi-point connections is not implemented in the control interface unit.
Connection details are shown in the diagram on page 3. Terminals 15 to 18 should be
used for the RS 422. For the RS 485, Terminals 17 and 18 should be connected.
5.3 20 mA current loop or TTY interface
The TTY interface was originally designed for teletype control. Two pairs of conduc-
tors are used, one to send, and one to receive data.The data can be transferred in full
duplex mode, which is not supported by the control interface unit. Current loop trans-
mission is very resistant to interference and therefore offers secure data transmission,
even where long lengths of cable are used.
The current loop connections of the control interface unit are galvanically isolated by
opto-couplers. The control interface unit represents the passive side of the transmis-
sion, i.e. the current and voltage required for transmission must be provided at the
other end.
5.4 Connection cables
The maximum cable length between the control interface unit and the host computer
will vary according to the data transmission speed, the interface standard and the lev-
el of interference. For this reason it is only possible to give approximate values:
A screened twisted twin-core cable with a minimum wire cross-section of 0.14 mm2
should be used for the connection.
The screen of the read head lead is connected on both sides to earth (PE) with low
resistence and low induction. For that the attached terminal block can be used (see
figure 5.3). Please make sure that the screen is kept as small as possible.
Standard Max. cable length
RS 232 15 m
RS 422 1000 m
RS 485 1000 m
20 mA current loop 1000 m

IDENT-I • IRI-KHA6-4.RX, IRI-KHD2-4.RX
Serial interface/DIP switches
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ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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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 27.02.2002
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Bild 5.3: Terminal block with connecting cables
Read head cable lengths up to 50 m or 100 m are possible if the following conditions
are satisfied:
up to 50 m read head cable:2cross sectional area of at least 4 x 0.25 mm2
maximum resistance 78 Ohm/km
maximum capacitance 90 pF/m
(e.g. LIYC11C, Mukkenhaut & Nusselt MUNFLEX
C11Y)
up to 100 m read head cable:2cross sectional area of at least 4 x 0.5 mm2
maximum resistance 37 Ohm/km
maximum capacitance 90 pF/m
With a cable length of 100 m, a series resistor of 82 Ohm must be fitted
in the cable connected to the 'Reset' terminal of the control interface
unit.
Since more EM interference can result with longer cable lengths, the
maximum cable lengths given above might not be possible for some
applications.
If leads with double shielding are used, e.g. metallic wire mesh and
metallic foil, they must be connected to each other using a low imped-
ance connection at one end of the cable.
Many noise impulses come from the supply cables, e.g. switch-on cur-
rent of a motor. For this reason, running the supply cables in parallel
with the data/signal cables, especially in the same cable duct, should be
avoided.

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Commands
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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.

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Commands
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Further system commands to operate the interface unit
There are further system commands which issue control instructions such as, for
example, restart, changeover to binary mode or software number specification. The
system commands are accomplished in normal as well as in binary mode. These
commands do not specify any further parameters such as the read head number.
6.1 Read head number RHn
In the command mode, the read heads are specified as 1, 2, 3 or 4. If, instead of a
read head number, an X is sent, the read heads are interrogated one in sequence
(R mode). In the AR mode reading continues until a code carrier is read. With the CAR
mode, all the read heads continue to read until a new command is entered.
At switch on, read head 1 is selected. If a read head number is not specified, the pre-
viously selected head remains effective. All read heads can be switched off by select-
ing read head 0. This is a good police for minimizing energy usage.
RST Restart
All previously programmed commands are interrupted by this
command and the control interface is set to the default condi-
tion, i.e. no active read command and data format 10. The
RST command determines the parity setting of the serial
communication at switch on of the control interface. Since by
this command the control interface recognizes the parame-
ters for serial transmission, the command must consist of
either all upper case or all lower case letters.
SB Set binary mode
All read data is transmitted at 8 data bits per byte. This for-
mat functions only when the serial interface is also set to
transmit 8 data bits per byte and is recommended when rapid
data transmission is called for. The SB command is only per-
missible when one of the data formats 28, 64 or 256 has
been set beforehand by a read command. To quite the
mode, an RST command is sent.
VER Version number
The software version and the copyright message are dis-
played by use of this command.

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Commands
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Beispiele:
6.2 Data formats DF
The data format can be specified in any command which expects a read code as pe-
sonse. If the data format is not specified, the previously selected format remains ef-
fective. When the format is specified, it must be preceded by a comma in order to
distinguish it from the read head number. At system switch on, format 10 is adopted
and the data output is in ASCII characters. The binary representation can be selected
by an SB command.
In the basic setting, all data is delivered as ASCII characters but depending upon the
data format this takes place in denary or hexadecimal form. In the binary mode all
data is transmitted without conversion into ASCII characters. No distinction is made
between denary and hexadecimal. In data format 10 - the basic setting - the binary
mode is not admissible and the code is always transmitted as ASCII characters.
R1<CR><LF> The read head 1 reads a code if a code carrier is available. If
no code carrier is available within range of the read head an
error message will be issued.
arx<CR><LF> If, for example, the read heads 1, 3 and 4 are connected,
they will be activated one by another. When a code carrier
comes within range of the read head it will be read and
transmitted.
Data format Explanation
10 This format is active following switching on and of the con-
trol interface after sending an RST command. All 64 bits of a
cod carrier are read but only the 28 bits of user data are
returned. A read head number is not returned. The first 12
bits are sent in hexadecimal and remaining 16 bits in
denary. All information is then transferred as ASCII charac-
ters, the binary mode not being admissible. In the event of
the binary mode being selected, an error message will be
returned.
28 All 64 code carrier bits are read but only the 28 user data
bits are returned. In the binary mode no denary conversion
takes place. The code follows the read head number and is
preceded by a space character.
64 A code carrier is read and all 64 bits returned in hexadeci-
mal form.

IDENT-I • IRI-KHD2-4.RX, IRI-KHA6-4.RX
Commands
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umutbare Änderungen aufgrund technischer Verbesserungen vorbehalten. Copyright Pepperl+Fuchs, Printed in Germany
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Ausgabedatum 27.02.2002
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Example:
A code carrier contains the code A011C3E3B900F0F0 in hexadecimal form. The
code shall be read by the heed 3.
In data format 10 the first 12 bits (A01h=1010 0000 0001b) are transmitted in hexa-
decimal form. The following 16 bits (1C3Eh = 0001 1100 0011 1110b) are converted
into a binary number (1C3Eh =7230d). A read head number does NOT precede the
code and hence the read head number "X" only makes sense when there is only one
read head. Consequently, in the example, the following character is sent.
No provision is made for the binary mode in data format 10.
In data format 28 the first 12 bits (A01h = 1010 0000 0001b) and the following 16 bits
(1C3Eh = 0001 1100 0011 1110b) are separately converted into denary (A01h=2561d
and 1C3Eh=7230d). The code follows the read head number and is preceded by a
space character. Hence, the following character string is sent:
In the binary mode no denary conversion takes place. The read head number is de-
termined by bits 4 and 5 of the first byte. The two most significant bits, 6 and 7, are
set at 0.
The character "X" contains the first 4 code bits.
ASCII A017230<CR><LF>
Hex 41 30 31 37 32 33 30 0D 0A
Den. 65 48 49 55 50 51 48 13 10
ASCII 3 25617230<CR><LF>
Hex 33 20 32 35 36 31 37 32 33 30 0D 0A
Den. 51 32 50 53 54 49 55 50 51 48 13 10
Bit 76543210
0000xxxx
Read head 1
0001xxxx
Read head 2
0010xxxx
Read head 3
0011xxxx
Read head 4
Read head number