IFM DTM436 User manual

Operating instructions
J1939 interface
RF-identification system
DTM436
DTM437
Read/write head
11464605 / 0006 / 2022
GB

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Contents
1 Preliminary note ............................................................. 3
1.1 Symbols used.......................................................... 3
1.2 Warnings used ......................................................... 3
1.3 Legal and copyright information ............................................ 3
2 Safety instructions............................................................ 4
3 Intended use................................................................ 5
4 Items supplied............................................................... 6
5 Function ................................................................... 7
5.1 ID tags ............................................................... 7
5.2 Device overview........................................................ 7
6 Installation.................................................................. 8
6.1 Notes on the unit installation............................................... 8
6.2 Avoiding interference .................................................... 8
6.3 Mechanical design ...................................................... 8
6.4 Install device........................................................... 9
6.5 Mounting distances...................................................... 9
6.6 Positioning of the ID tags ................................................. 10
7 Electrical connection.......................................................... 12
7.1 Wiring................................................................ 12
8 Operating and display elements................................................. 13
9 Operation .................................................................. 14
9.1 J1939 interface......................................................... 14
9.1.1 Proprietary protocol in PDU format 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9.1.2 Configuration example ............................................... 15
9.2 Parameter mapping...................................................... 16
9.3 Device status .......................................................... 16
9.4 ID tag data access ...................................................... 18
9.4.1 Read data from ID tag................................................ 18
9.4.2 Write data to ID tag.................................................. 18
9.5 Settings............................................................... 19
9.5.1 Device address (0x2000) and baud rate (0x2001). . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.5.2 Address claiming.................................................... 19
9.5.3 Reset read/write head................................................ 19
10 Maintenance, repair and disposal................................................ 20
11 Approvals/standards.......................................................... 21
Glossary................................................................... 22

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1 Preliminary note
You will find instructions, technical data, approvals and further information using the QR code on the
unit / packaging or at www.ifm.com.
1.1 Symbols used
Requirement
Instructions
Reaction, result
[...] Designation of keys, buttons or indications
Cross-reference
Important note
Non-compliance may result in malfunction or interference.
Information
Supplementary note
1.2 Warnings used
ATTENTION
Warning of damage to property
1.3 Legal and copyright information
© All rights reserved by ifm electronic gmbh. No part of these instructions may be reproduced and
used without the consent of ifm electronic gmbh.
All product names, pictures, companies or other brands used on our pages are the property of the
respective rights owners.

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2 Safety instructions
General
• The unit described is a subcomponent for integration into a system.
– The system architect is responsible for the safety of the system.
– The system architect undertakes to perform a risk assessment and to create documentation in
accordance with legal and normative requirements to be provided to the operator and user of
the system. This documentation must contain all necessary information and safety instructions
for the operator, the user and, if applicable, for any service personnel authorised by the
architect of the system.
• Read this document before setting up the product and keep it during the entire service life.
• The product must be suitable for the corresponding applications and environmental conditions
without any restrictions.
• Only use the product for its intended purpose (Ò → Intended use).
• If the operating instructions or the technical data are not adhered to, personal injury and/or damage
to property may occur.
• The manufacturer assumes no liability or warranty for any consequences caused by tampering with
the product or incorrect use by the operator.
• Installation, electrical connection, set-up, operation and maintenance of the product must be
carried out by qualified personnel authorised by the machine operator.
• Protect units and cables against damage.
Radio equipment
In general, radio equipment must not be used in the vicinity of petrol stations, fuel depots, chemical
plants or blasting operations.
uDo not transport and store any flammable gases, liquids or explosive substances near the unit.
Interference of electronic and medical devices
Operation can affect the function of electronic devices that are not correctly shielded.
uDisconnect the device in the vicinity of medical equipment.
uContact the manufacturer of the corresponding device in case of any interference.

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3 Intended use
The read/write head reads and writes ID tags without contact.
The data is made available as process data via the CAN-bus interface.

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4 Items supplied
• Read/write head
• 2x hexagonal nut
The device is supplied without installation and connection accessories.
Available accessories: www.ifm.com.
The optimum function is not ensured when using components from other manufacturers.

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5 Function
5.1 ID tags
The ID tags are passively operated without a battery. The energy required for operation is provided by
the read/write head.
The energy is provided via an inductive coupling. The integrated antenna coil in the read/write head
generates a magnetic field which partly penetrates the antenna coil of the ID tag. A voltage is
generated by induction that supplies the data carrier with energy.
The device supports ID tags according to ISO 15693.
5.2 Device overview
DTM436
Article number: DTM436
Function: Read/write head
Type designation: DTMHF IBRWCJUS03
Type: M30, flush mountable
DTM437
Article number: DTM437
Function: Read/write head
Type designation: DTMHF INRWCJUS03
Type: M30, non-flush mountable

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6 Installation
6.1 Notes on the unit installation
When mounting several RFID units adhere to the minimum distances between the systems.
Flush mounting of a read/write head in metal reduces the read/write distance.
Device performance can be affected if positioned in the immediate vicinity of powerful HF
emission sources such as welding transformers or converters.
6.2 Avoiding interference
The device generates a modulated electrical field with a frequency of 13.56 MHz.
Avoid interference with data communication:
uDo not operate any devices in the vicinity that use the same frequency band.
wSuch devices are for example frequency converters and switched-mode power supplies.
If there are other devices in the same frequency band in the vicinity:
uThe mounting distances between the devices should be as large as possible.
uUse the devices in alternating operation.
uSwitch the HF field of the device on/off.
6.3 Mechanical design
DTM436
Fig.1: DTM436
1 Sensing face
DTM437
Fig.2: DTM437
1 Sensing face

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6.4 Install device
uFix the device using the supplied nuts (M30).
DTM436
Fig.3: Flush mounting
DTM437
Fig.4: Non-flush mounting
6.5 Mounting distances
DTM436
Operating mode Distance side (A) Distance front (B)
For reading and writing ≥ 60 mm ≥ 120 mm

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DTM437
Operating mode Distance side (A) Distance front (B)
For reading and writing ≥ 100 mm ≥ 200 mm
6.6 Positioning of the ID tags
The sensing face marks the centre of the integrated antenna coil of the read/write head.
uAlign the sensing face of the read/write head and the ID tag in the same way.
For installation in or on metal use the ID tags provided for this purpose.
Position the ID tag in the area of the sensing face. When doing so, the angle of aperture and the
operating distance must be adhered to (→ Data sheet of the device).
DTM436
D
Fig.5: Position the ID tag
uAlign the ID tag on the central axis of the antenna of the device.
wThe distance “D” is indicated in the data sheet.
DTM437
D
Fig.6: Position the ID tag

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uAlign the ID tag on the central axis of the antenna of the device.
wThe distance “D” is indicated in the data sheet.

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7 Electrical connection
The device must be connected by a qualified electrician.
Device of protection class III (PC III).
The electrical supply must only be made via PELV/SELV circuits.
uDisconnect power before connecting the device.
7.1 Wiring
uConnect the device to the CAN bus using the M12 connector.
wVoltage is supplied via the CAN bus.
Pin assignment Wiring
M12 connector, A-coded, 5 poles
4
2 1
3
5
1: Shield
2: U+
3: GND
4: CAN high
5: CAN low
The CAN bus connection is almost trouble-free if the following points are considered:
uUse cables approved for CAN bus.
uTerminate the cables with 120 Ω terminating resistors.
Information on available sockets see: www.ifm.com.

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8 Operating and display elements
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1
1 LEDs green / yellow / red
LED State Description
green on Operating status operational
flashes Device deactivated
yellow on ID tag detected
flashes once for 1/4 s ID tag read or written successfully
flashes briefly 4x ID tag read or written with errors
red on CAN bus not accessible
flashes Device hardware fault

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9 Operation
9.1 J1939 interface
The RFID read/write heads have a standardised SAE J1939 interface. All measured values and
parameters can be accessed via the J1939 protocol. The individual configuration can be saved in the
internal permanent memory.
Structure of the SAE J1939 protocol
The SAE J1939 protocol uses a 29-bit CAN identifier (extended frame format CAN 2.0B). A J1939
message has the following structure:
J1939 message
29-bit CAN identifier Data
Priority Parameter Group Number
(PGN)
Source address User data of the message
28…26 25…8 7…0 0…8 bytes
▼
Parameter Group Number (PGN)
Ext. Data Page Data Page PDU Format (PF) Target address / group exten-
sion (PS)
25 24 23…16 15…8
▼
PDU format 1 (specific)
00h - EFh Target Address (DA)
23…16 15…8
PDU format 2 (global)
F0h - FFh Group Extension (GE)
23…16 15…8
PDU format 1
This format defines a message which is sent to a defined device. In this case the PDU-specific byte
(PS) is the target address (DA) of the device. If the value of the PDU format field (PF) is between 0x00
and 0xEF, it is a PDU format 1 message.
For proprietary messages (manufacturer-specific) the PDU format value 0xEF is defined.
Ext. data page bit = 0 and data page bit = 0.
PDU format 2
This format defines a message which is sent globally. In this case the PDU specific byte (PS)
corresponds to the group extension (GE). If the value of the PDU format field (PF) is between 0xF0
and 0xFF, it is a PDU format 2 message.
For proprietary messages (manufacturer-specific) the area PDU format (PF) and group extension (GE)
0xFF00 – 0xFFFF is defined.
Ext. data page bit = 0 and data page bit = 0.

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9.1.1 Proprietary protocol in PDU format 1
The parameters of the device are listed in a table that is accessed per 16-bit index. To access the
sensor parameters in reading or writing the proprietary PDU format 1 message is used. PDU format
(PF) corresponds to the value 0xEF. In this case the PDU-specific byte (PS) is the target address (DA)
of the device which is to receive the message. If more than 4 bytes are transferred, the J1939
transport protocol must be used.
Example
Address target device (ECU): 0x3B
Address control unit / master: 0x14
Priority of the message: 3
CAN identifier 8-byte data frame
ID Parameter index Read/Write Status 4-byte data
29 bits 2 bytes 1 bytes 1 bytes
Requirement: Master → ECU
CAN identi-
fier 8-byte data frame
0xCEFEB1
4
LSB MSB RW 0 LSB .. .. MSB
Response: Master ← ECU
CAN identi-
fier 8-byte data frame
0xCEF14E
B
LSB MSB RW SC LSB .. .. MSB
Parameter index: 2-byte parameter index.
RW: Read parameter → 0x00 / write parameter → 0x01
SC: Status code
0x00: Ok
0x01: Parameter value too small
0x02: Parameter value too big
0x03: Parameter index does not exist
0x04: Parameter can only be read
0x05: Parameter can only be written
0x06: No access to parameter
0x07: Invalid data size
0x08: Parameter writing blocked
(Example: The value to be written is already set in the sensor)
0x09: Invalid command
0x0A: Unknown error
0x0B: Error while reading or writing from ID tag
9.1.2 Configuration example
Set block size of ID tag to 8, index 0x2800
Address target device (ECU): 0xEB

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Address control unit / master: 0x14
Priority of the message: 3
Requirement: Master → ECU
CAN identi-
fier 8-byte data frame
0xCEFEB14 0x00 0x28 0x01 0x00 0x08 0x00 0x00 0x00
Response: Master ← ECU
CAN identi-
fier 8-byte data frame
0xCEF14EB 0x00 0x28 0x01 0x00 0x08 0x00 0x00 0x00
9.2 Parameter mapping
Index Type Value R/W Saved Preset
0x0500 Byte stream Device Name ro
0x0501 Byte stream Software version ro
0x2000 Unsigned8 Default device ad-
dress (may be
changed after ad-
dress claiming)
rw X 235
0x2001 Unsigned16 Baud rate in kbit/s rw X 250
0x2002 Boolean Device reset rw
0x2080 Unsigned8 Device status ro
0x2800 Unsigned8 Block size rw X 4
0xA000 Byte stream ID tag UID ro
0xA001 Byte stream ID tag data rw
9.3 Device status
The parameter with the index 0x2080 represents the current device status:
Bit 31 30 29 28 27 26 25 24
Status tag_err
Bit 23 22 21 20 19 18 17 16
Status acc_err
Bit 15 14 13 12 11 10 9 8
Status r r r r r r r J1939_err
Bit 7 6 5 4 3 2 1 0
Status claim r buf_ovfl fr_err r present ant pow

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Status Value Description
pow 1 Power enabled (value always 1)
ant 0 Antenna deactivated
1 Antenna activated
present 0 No ID tag present
1 ID tag present
fr_err 0 Front end OK
1 Front end error detected (hardware problem)
buf_ovfl 0 Buffer OK
1 Buffer overflow detected
claim 0 Address claiming OK
1 Address claiming not successful
J1939_err 0 No J1939 error occurred
1 J1939 error occurred
acc_err Error of last write operation
tag_err 1 Error message ID tag for last operation
Access error codes
Updated after each write or read access of the ID tag.
Index Value Description
0x00 ISO_COMMAND_ERROR_NO_ERROR No error, command successfully executed.
0x01 ISO_COMMAND_ERROR_NO_RE-
SPONSE
ID tag did not answer. Maybe ID tag is not in the field any-
more.
0x02 ISO_COMMAND_ERROR_RX_ERROR Error while receiving the answer from the ID tag (CRC error,
framing error, collision, etc.).
ID tag error codes
Updated after each read or write access of the ID tag.
Index Value Description
0x00 ISO_TAG_ERROR_NO_ERROR No error from the ID tag.
0x01 ISO_TAG_ERROR_COM-
MAND_NOT_SPECIFIED
The command is not supported.
0x02 ISO_TAG_ERROR_COMMAND_SYN-
TAX
Cannot recognise the command. The number of blocks is too
high. Example: format error.
0x03 ISO_TAG_ERROR_OPTION_NOT_SUP-
PORTED
Option is not supported.
0x0F ISO_TAG_ERROR_OTHER Other error.
0x10 ISO_TAG_ERROR_BLOCK_NOT_USA-
BLE
The specified block cannot be used (or was not found).
0x11 ISO_TAG_ERROR_BLOCK_AL-
READY_BLOCKED
The specified block is locked and cannot be locked again.
0x12 ISO_TAG_ERROR_BLOCK_NOT_UP-
DATEABLE
The specified block is locked and its contents cannot be up-
dated.
0x13 ISO_TAG_ER-
ROR_BLOCK_WRITE_VERIFY
The specified block cannot be programmed (a write verify er-
ror occurred).
0x14 ISO_TAG_ER-
ROR_BLOCK_LOCK_VERIFY
The specified block cannot be locked (a lock verify error oc-
curred).

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9.4 ID tag data access
9.4.1 Read data from ID tag
The data is read by the ID tag by sending a "read parameter" frame with the following information:
• Data address
• Data length
CAN identi-
fier 8-byte data frame
ID
29 bits
Parameter index
2 bytes
Read/Write
1 byte
Status
1 byte
ID tag
Data address
ID tag
Data length
0x01 0xA0 0x00 0x00 LSB MSB LSB MSB
Example
Read 8 bytes of data from ID tag address 4.
Requirement: Master → ECU
CAN identi-
fier 8-byte data frame
0xCEFEB14 0x01 0xA0 0x00 0x00 0x04 0x00 0x08 0x00
Response: Master ← ECU
CAN identi-
fier 8-byte data frame
0xCEF14EB 0x01 0xA0 0x00 0x00 Data[0] Data[1] Data[2] …
For successful reading and writing, the ID tag must be in the detection range of the read/write
head. In the event of data read and write errors, the status byte responds with 0x0B.
9.4.2 Write data to ID tag
The data is written to the ID tag by sending a "write parameter" frame with the following information:
• Data address
• Data length
• Data
CAN
identifier x-byte data frame
ID
29 bits
Parameter index
2 bytes
Read/
Write
1 byte
Status
1 byte
ID tag
Data address
ID tag
Data length
ID tag
Data
0x01 0xA0 0x00 0x00 LSB MSB LSB MSB Data[0] Data[x]
Example
Write 4 bytes of data (0xAA,0xBB,0xCC,0xDD) to ID tag address 2.
Requirement: Master → ECU

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CAN
identi-
fier
x-byte data frame
0xCEF
EB14
0x01 0xA0 0x01 0x00 0x02 0x00 0x04 0x00 0xAA 0xBB 0xCC 0xDD
Response: Master ← ECU
CAN identifier x-byte data frame
0xCEF14EB 0x01 0xA0 0x01 0x00
For successful reading and writing, the ID tag must be in the detection range of the read/write
head. In the event of data read and write errors, the status byte responds with 0x0B.
9.5 Settings
9.5.1 Device address (0x2000) and baud rate (0x2001)
Valid values for the device address are: 0 to 253.
Preferably use the preset device address. Via "address claiming" the device address can be changed.
Valid values for the baud rate are: 250 kBits/s, 500 kBits/s.
Default settings of the device:
wDevice address (ECU): 235
wBaud rate: 250 kBits/s
Use the set device address only once in the CAN network.
uUse “address claiming” in the CAN network to avoid conflicts. (Ò Address claiming/19)
Only after resetting the read/write head will a changed device address and baud rate become
effective.
uReset the read/write head with the reset command or hardware reset. (Ò Reset read/write
head/19)
9.5.2 Address claiming
The read/write head supports “dynamic address claiming”.
By default, the device address is 235. With the device address, the sensor logs in to the network
during start-up. Unless there is an address conflict with other network participants, the sensor starts
communication automatically.
Arbitrary address capable (CA)
If the set address of the device is already used in the network, the participant with a higher priority will
be accepted by the network. The rejected network participant with a lower priority will be assigned
another valid device address.
9.5.3 Reset read/write head
By writing the value “1” to the parameter index 0x2002 the read/write head is reset.
After writing the value, the read/write head is reset immediately. No response frame is sent from
the read/write head.

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10 Maintenance, repair and disposal
The unit is maintenance-free.
uContact ifm in case of malfunction.
uDo not open the housing as the unit does not contain any components which can be maintained by
the user. The unit must only be repaired by the manufacturer.
uClean the device using a dry cloth.
uDispose of the unit in accordance with the national environmental regulations.