Hydac HPT 1000 Setup guide

Part No.: 670061 / Edition: 2021-07-13 E
(Translation of
original
instructions)
Protocol
Description
SAE J1939
HPT 1000
Pressure transmitter

2 HPT 1000 SAE J1939
Edition: 2021-07-13 HYDAC ELECTRONIC GMBH Part no.: 670061
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Content
1Introduction ______________________________________________________ 5
1.1 Functions............................................................................................................5
2Address Claiming _________________________________________________ 5
2.1 General overview ...............................................................................................5
2.2 Name ...................................................................................................................5
2.3 Address...............................................................................................................6
2.4 Start-up process.................................................................................................7
3Basic principles ___________________________________________________ 7
3.1 General communication characteristics..........................................................7
3.2 Display of numeric figures ................................................................................7
4Configuration _____________________________________________________ 8
4.1 General overview ...............................................................................................8
4.2 Settings...............................................................................................................8
4.2.1 List of the settings (Object List "OL") ______________________________ 8
a. Profile_________________________________________________________ 9
b. General _______________________________________________________ 9
c. Name sections _________________________________________________ 9
d. Transmission of measured values _________________________________ 9
e. Measured values display, pressure _______________________________ 10
f. Operation Data ________________________________________________ 10
g. Measured values display, device temperature ______________________ 10
h. Commands ___________________________________________________ 11
4.2.2 Setting of the Baud rate_________________________________________ 11
4.2.3 Settings for measured value transmission _________________________ 11
4.2.4 Settings of measured values display ______________________________ 12
4.2.5 Device mode and device status __________________________________ 13
4.3 Carry out configuration ...................................................................................14
4.4 Structure of the SAE J1939 29-BIT CAN-ID....................................................15
4.4.1 Description PGN 61184 "Proprietary A"____________________________ 15
4.4.2 CAN-ID Example for configuration communication with sensor address 1_ 15
4.5 Short description of the configuration message...........................................16
4.5.1 Description "ack" (Acknowledge Code) of the configuration message __ 16
4.5.2 Description of the configuration range "value"______________________ 17

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4.6 Commands........................................................................................................17
4.6.1 Start editing mode _____________________________________________ 17
4.6.2 Saving the settings_____________________________________________ 18
4.6.3 Reset to factory default settings__________________________________ 18
4.6.4 Restart _______________________________________________________ 18
4.7 Device-specific control commands................................................................19
4.7.1 Auto calibration pressure - Index 37 ______________________________ 19
4.8 Example configuration process......................................................................20
4.8.1 Example: Read out profile number________________________________ 20
4.8.2 Example: Reading the serial number ______________________________ 20
4.8.3 Example: Edit Baud rate ________________________________________ 20
4.8.4 Example for a communication sequence___________________________ 21
4.8.5 CAN Log Example HDA 7000 J1939 Address 1 Transmit-Rate to 100ms _ 21
5Sending the measured value _______________________________________ 22
6Miscellaneous ___________________________________________________ 22

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Preface
This documentation describes the intended use of the product within a
superordinate control system. It will help you to get acquainted with the
provided communication interface and assist you in obtaining maximum
benefit in the possible applications for which it is designed.
The specifications given in this documentation represent the state-of-the-
art of the product at the time of publishing. Modifications to technical
specifications, illustrations and dimensions are therefore possible.
Should you find any errors whilst using this manual, or have any
suggestions for improvements, please contact:
HYDAC ELECTRONIC GMBH
Technische Dokumentation
Hauptstrasse 27
66128 Saarbruecken
-Germany-
Phone:[phone] / 509-01
Fax: [phone]
Email: [email protected]
We look forward to receiving your input.
“Putting experience into practice”
-------------------------------------------------------------------------------------------------
This document, including the illustrations contained therein, is subject to
copyright protection. Use of these instructions by third parties in
contravention of copyright regulations is forbidden. Reproduction,
translation as well as electronic and photographic archiving and
modification require the written permission of the manufacturer. Offenders
will be liable for damages.
In the event of translation, only the original version of the instruction
manual in German is legally valid.

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1 Introduction
The HPT has a CAN 2.0 B interface and can be operated according to the process defined in
the standards SAE-J1939. The interface functions are divided into 3 parts:
Address Claiming, Configuration and Sending of measured values
1.1 Functions
Measuring the current pressure value using:
- 1kHz sample rate
- Resolution 13 bit
Measuring the actual pressure value
Conversion of the pressure value into a user-scaleable linear process value
Sending the current pressure value and device temperature:
- Cyclically, within the range from 1 millisecond up to 1 minute
2 Address Claiming
2.1 General overview
Each HPT has a name and an address. Both can be configured by the user. The name of the
HPT is a 64 bit value and is clearly recognisable worldwide, the address is an 8 bit value
which must be clearly recognisable by the bus. This means, it is not allowed to have two
devices with the same address connected to the same bus.
During Address Claiming the HPT communicates its address and name to the other bus
participants. This is a reaction to eventual address conflicts.
2.2 Name
The name consists of the following parts:
Addressing ability
1 Bit Arbitrary Address Capable
Function specific sections
3 Bit Industrial Group (i.e. Global, Marine, Agriculture, ...)
7 Bit Vehicle System (depends on Industrial Group: Tractor, trailer, etc.)
4 Bit Vehicle System Instance (sequence number for systems of the same kind)
8 Bit Function (depending on Industrial Group: i.e. System Display, Levelling System, etc.)
5 Bit Function Instance (sequence number for functions of the same kind)
3 Bit ECU-Instance (sequence number for controllers having the same function)
Manufacturer specific sections
11 Bit Manufacturer Code
21 Bit Idendity
The function-related parts are configurable, the manufacturer-related parts are firmly
defined. This ensures a worldwide clear address identification.

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Options for changing the J1939 name:
Via Index 10-19
The sensor supports the J1939 name management to standard
J1939-81. By means of the "name management" - Message (PGN
37632) the J1939 name can be changed during operation. The
manufacturer code of the J1939 name may not be changed, it always
corresponds with the manufacturer ID.
2.3 Address
The address can be set between 0 and 253. The address 254 is reserved for the status "no
address assigned", the value 255 is used as broadcast address.
In each message the HPT sends, the address is assigned to the lowest 8 bits of the CAN ID.
Possibilities for addressing:
The sensor can be configured as a "service configurable device" via
an extra process which is separated from the bus. With this process,
our proprietary entries will be used to address the device (Index 1).
The sensor supports the dynamic addressing according to the J1939-
81 standard. Dynamic addressing is enabled if the bit "arbitrary
address capable" of the J1939 name corresponds to 1 and inactive,
when it corresponds with 0. If dynamic addressing is enabled, the
device sends a "request for address claim" message at start-up, in
order to detect all the used addresses and to select one free address
in a second step.
The sensor supports the "commanded address" message (PGN
65240) to the J1939-81 standard. Herewith a new address can be
assigned to the device after a previous failure of an address claim
has occurred. The configured address is valid until next restart,
however, it can be stored persistently via a subsequent configuration
process by means of the entry 102.

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2.4 Start-up process
After each start-up, the HPT sends an "Address Claimed" message. Thus, it communicates
its address and its name to the other participants. This message can also be requested by
other participants using a "request" message.
If an other participant sends an "Address Claimed" message using the same address, the
reaction of the HPT depends on the name of the other participant.
If HPT name is lower than the numerical name of the other participant, it again sends an
"Address Claimed" message.
If the HPT name is (numerically) higher and does not use dynamic addressing, it will send a
"Cannot Claim" message, it does neither have an own address nor will it start operating. It
needs to be briefly disconnected from the supply voltage or it requires manual configuration
by means of a "commanded address" message (PGN65240). If dynamic addressing is
enabled, the HPT selects the next available address, sends a new "address claimed"
message and, if necessary, performs a new priorisation of the name. This processus is
repeated until a vacant address has been claimed or until no vacant address could be found.
If no vacant address could be found, a "cannot claim" message will be sent.
After sending an "Address Claimed" message, it takes 250 ms until the HPT takes up its
regular operation mode. This is one of the requirements of SAE-J1939 to give other devices
having the same address enough time to respond.
3 Basic principles
The following sections will explain non-product specific information for a better understanding
of the functioning principle of a measurement system with a communication interface.
3.1 General communication characteristics
In general, the measurement systems are the end-nodes within a communication network.
They do not take control of their superordinate network themselves. However, these devices
are able to generate and send information spontaneously. In doing this, the measurement
systems mainly serve as a data source.
3.2 Display of numeric figures
The figures without additional marking are displayed as numeric figures with decimals
(number basis 10). For a more simple display of data blocks, however, hexadecimal
representation is also very commonly used (number basis 16). In our document, the
hexadecimals are generally marked by a "0x" as a prefix.
Decimal numbers, when displayed in a mixed representation, are marked with the additional
suffix "d".
Binary numbers (number basis 2) are marked by suffix "b".
0x12 12 hexadecimal →18 decimal
0xA2 A2 hexadecimal →162 decimal
16d 16 decimal →10 hexadecimal
66 66 decimal →42 hexadecimal
10b 10 binary →2 decimal

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4 Configuration
4.1 General overview
The HPT has different settings which can be read and written by a master using SAE-J1939
messages. This is carried out by means of a so-called proprietary parameter group A with the
PGN 61184 (0x00EF00). The data then contain information on which settings need to beread
or written as well as information on the configuration parameters.
4.2 Settings
All settings are managed in an object list OL (similar to the CANopen "object dictionary"). All
configuration objects in this list have a clear index, by means of which they can be addressed
individually. Some of the objecs represent device settings which can also be changed by the
operator. In the following tables, the objects or settings for the HPT 1000 are listed with their
related index. The object list is specific for each sensor with its special requirements.
The object access can only be defined as "read only" (ro) or "read and write" (rw). Objects
representing the device settings are generally changeable (rw).
The description of a communication process for reading or writing the
settings in the object list can be taken from the following chapters:
4.3 Carry out configuration
4.4 Structure of the SAE J1939 29-BIT CAN-ID
4.5 Short description of the configuration message
4.6 Commands
4.7 Device-specific control commands
4.8 Example configuration process
4.2.1 List of the settings (Object List "OL")
In the following table, all the settings with their corresponding index are listed. The entries are
addressed via a numerical index. For complex objects, there is also the option for addressing
subordinate entries by mean of a sub index. For simple objects, however, this value is "0".
The data type indicates how the data are to be interpreted. In a uint16 value for example, only
the two first bytes are used and interpreted as an unsigned 16 bit integer value; see chapter
4.5.2 Description of the configuration range "value".
Some settings can only be read (ro = read only), others can be written as well (rw = read
write).
All default settings shown in brackets are typical and may deviate from the pre-set factory
settings.
Note:
All index and sub index values of the OL are indicated in decimal notation.

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a. Profile
Index
Sub index
Data type
r/w
Settings
0
0
uint16
ro
The profile number defines the layout of the setting
table. It is always 1 for HPT.
b. General
Index
Sub index
Data type
r/w
Settings
1
0
uint8
rw
Address (1)
2
0
uint8
rw
Baud rate, see Baud rate table below.
(3 = 250 kBit/s)
3
0
string
ro
The characters 1-4 in the internal device ID
correspond with the Software ID ("Hptj").
4
0
string
ro
The characters 5-8 of the internal device ID
(Software ID) ("2 ")
5
0
string
ro
Version and release number (i.e. 0510=Version5,
Release10)
6
0
uint32
ro
Product code, 32 bit number
7
0
uint32
ro
Serial number, 32 bit number
c. Name sections
Index
Sub index
Data type
r/w
Settings
10
0
unit8
rw
1 Bit Arbitrary Address Capable (addressing mode)
11
0
uint8
rw
3 Bit Industrial group (0=Global)
12
0
uint8
rw
7 Bit Vehicle system (0x7F)
13
0
uint8
rw
4 Bit Vehicle system instance (0)
14
0
uint8
rw
8 Bit Function (0xFF)
15
0
uint8
rw
5 Bit Function instance (0)
16
0
uint8
rw
3 Bit Control unit instance (0)
17
0
unit8
rw
1 Bit Reserved
18
0
uint16
ro
11 Bit Manufacturer code
(124 = HYDAC ELECTRONIC GMBH)
19
0
uint32
ro
21 Bit Identity Number (corresponds with serial
number)
d. Transmission of measured values
Index
Sub index
Data type
r/w
Settings
21
0
uint16
rw
Transmission rate [ms] (e.g. 100)
22
0
uint8
rw
Message length [Bytes], 2..8 (e.g. 8)
23
0
uint8
rw
Priority, 0..7 (e.g. 6)
24
0
uint8
rw
PDU format (e.g. 0xFF = proprietary B)
25
0
uint8
rw
PDU Specific (e.g. 0x00)

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26
0
uint8
rw
Offset of the pressure in the message [bytes] (e.g. 0)
see chapter 4.2.3 Settings for measured value
transmission
27
0
uint8
rw
Offset of the device temperature in the message [bytes]
(e.g. 4), see chapter 4.2.3 Settings for measured
value transmission
28
0
uint8
rw
Extended Data Page bit (e.g. 0)
29
0
uint8
rw
Data Page bit (e.g. 0)
e. Measured values display, pressure
The default values depend on the measuring range of the pressure transmitter. In the following,
the default values for an HPT 1000 pressure transmitter are listed.
Index
Subindex
Data type
r/w
Settings
31
0
uint8
rw
Unit 0: bar, 1: psi, 2: MPa (e.g. 0 = bar)
32
0
uint8
rw
Data length (e.g. 2)
2: 16 Bit (2 Bytes), 4: 32 Bit (4 Bytes)
33
0
uint32
rw
Resolution per digit with 3 decimal places
(e.g. 50; increment here: 0.050 bar)
34
0
int32
rw
Offset of the measured value with 3 decimals (e.g. 0)
35
0
int32
ro
Lower measuring range with 3 decimals (i.e. 0)
36
0
int32
ro
Upper measuring range with 3 decimals
(e.g. 250000 = 250.000 bar)
37
0
uint8
wo
perform auto calibration
see chapter 4.7.1 Auto calibration pressure - Index 37
f. Operation Data
Index
Sub index
Data type
r/w
Settings
51
0
uint16
uint32
ro
Measured value, pressure
Data type depending on Index 32 "data length"
53
0
uint32
ro
Device mode / status
54
0
uint16
uint32
ro
Measured value, device temperature
Data type depending on Index 62 "data length"
59
0
uint8
ro
Highest sub index status channel (3)
59
1
uint32
ro
Status channel 1 (pressure)
59
3
uint32
ro
Status channel 3 (device temperature)
g. Measured values display, device temperature
The measuring range of the device temperature is -25 .. 100 °C.
Index
Subindex
Data type
r/w
Settings
61
0
uint8
rw
Unit 3: °C, 4: °F, 5: K (e.g. 3 =°C)
62
0
uint8
rw
Data length (e.g. 2)
2: 16 Bit (2 Bytes), 4: 32 Bit (4 Bytes)