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

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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)

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63
0
uint32
rw
Resolution per digit with 3 decimal places
(e.g. 250; increment here. 0.250 °C)
64
0
int32
rw
Offset of the measured value with 3 decimals.
(i.e. -25000 = -25.000 °C)
65
0
int32
ro
Lower measuring range with 3 decimals
(i.e. -25.000 °C)
66
0
int32
ro
Upper measuring range with 3 decimals
(i.e. 100000 = 100.000 °C)
h. Commands
see chapter 4.6 Commands
Index
Sub index
Data type
r/w
Settings
101
0
string
wo
Start editing mode ("edit")
102
0
string
wo
Saving the settings ("save")
103
0
string
wo
Reset to factory default settings ("load")
104
0
string
wo
Restart ("boot")
4.2.2 Setting of the Baud rate
HPT supports Baud rates from 10 kBit up to 1 MBit, according to the following table:
Index
Baud rate
0
1000 kBit
1
800 kBit
2
500 kBit
3
250 kBit
4
125 kBit
5
100 kBit
6
50 kBit
7
20 kBit
8
10 kBit
4.2.3 Settings for measured value transmission
During transmission of the measured values it is defined in which message the current
measured values will be transmitted and at which byte position and how often. This enables
to adapt the transmission of the measured values to an existing PGN. The data width,
however, is always 16 bits, which means 2 bytes. The pressure can thus, for instance, be
transmitted from the 4th byte in a message of 8 bytes length. The remaining 6 bytes in the
message are empty.
If the offset of a measured value is set to 0xFF, the measured value of this measured variable
will not be used in the PGN. Whether the offset is valid or not, depends on the offsets of the
other measured variables, their data length and the total length of the message.

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The following settings are possible:
The transmission rate (see Index 21) indicates how often the pressure value is transmitted.
The value is expressed in [ms]. At 0 ms the pressure is only transmitted on request.
The length of the message in which the pressure value is transmitted (see Index 22).
The priority of the message (see Index 23).
The PGN (Parameter Group Number) consisting of PF (Parameter Format) (see Index 24)
and PS (Parameter Specific) (see Index 25). The result of this PGN combined with the
priority and the address is the ID of the message by means of which the measured value(s)
is (are) sent.
Offset of the measured values in the message (see index 26 and index 27).
Example: Transmission of the measured pressure value
Message length: 6 Bytes
Data length of the measured pressure value: 2 Bytes
Offset pressure: 2 Bytes
Offset device temperature: 0xFF
Data: 0xFF 0xFF PV PV 0xFF 0xFF
Example: Transmission of the measured pressure and device temperature values
Message length: 8 Bytes
Data length of the measured pressure value: 2 Bytes
Offset pressure: 0 Bytes
Data length of the measured temperature value: 2 Bytes
Offset Temperature: 4 Bytes
Data: PV PV 0xFF 0xFF TV TV 0xFF 0xFF
4.2.4 Settings of measured values display
The measured values display defines how a certain pressure or the device temperature will
be displayed as a numerical value. The following settings are possible:
Setting the pressure unit (bar, psi or MPa) (see Index 31) and the device temperature
(°C, °F or K) (see Index 61).
Lower and upper measurement range (see Index 35 and 36 as well as index 65 and 66).
These values are readable only. The values are signed 32 bit values which are displayed
with 3 decimals.
Example: At an upper measuring range limit of 250 bar, for instance, the numerical value
250000 is read out.
The data length providing the current pressure or device temperature is pre-set to 16 bit (2
bytes). It can be changed to 32 bit (see Index 32 and 62).
By setting the resolution and the offset (see index 33 and 34 as well as index 63 and 64),
you can adjust the display of the current pressure or the device temperature value. Both
settings have 3 decimals as well. The resolution indicates the pressure or device
temperature per digit.
HPT only sends out the correct measured values if the measured values display is configured
in a way that all values within the measuring range fit into an unsigned 16 bit or 32 bit value.

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In the case of a 16 bit representation the measured value has to be configured in a way that
it stays within a range of [0..0xFFFD].
In the case of a 32 bit representation the measured value has to be configured in a way that
it stays within a range of [0..0xFFFFFFFD].
The values 0xFFFE (0xFFFFFFFE in a 32 bit representation) and 0xFFFF (0xFFFFFFFF in
a 32 bit representation) are reserved according to SAE J1939 and can therefore not be used
as measured values.
The 0xFFFE value signalises a measured value failure, the 0xFFFF indicates a measured
value which is not available.
Should an error occur, the device mode and the device status provide more detailed
information accordingly.
Example 1 pressure range from 0 to 250 bar
The current pressure value must be sent in steps of 0.05 bar. This leads to the following
settings
Unit: 0 (=bar)
Lower measuring range: 0 (0.000 bar)
Upper measuring range: 250000 (250.000 bar)
Offset: 0 (0.000 bar)
Resolution: 50 (0.050 bar/digit)
This means, a value of 1200 corresponds with 60 bar.
4.2.5 Device mode and device status
The device mode and the device status ( see Index 53) display the status of the device. Both
indications are 32 bits long. The first byte contains the device mode, the following three bytes
contain the device status. In the device status, each bit has a particular meaning.
The following table indicates which errors lead to which mode and which value corresponds
to which device status. In case of multiple errors, the status will result from an or-operation of
the error values.
Byte 1: Device Mode
Mode
Error
0
Ready for
operation
No active error present, device is ready for operation
2
Minor fault
A minor fault has recently occurred. As soon as the error has
been eliminated, the device will work again.
3
Moderate fault
A moderate fault has occurred. The error may possibly be
eliminated by switching the device on / off.
4
Serious error
A severe error has occurred.

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Byte 2+3: Device status
Status
Error
Mode
0x00000000
approved
0
Bit0 (0x00000001)
Loading the settings for the operation data recording has
not been successful
2
Bit1 (0x00000002)
ASIC error
3
Bit2 (0x00000004)
Measured value shortfall
0
Bit3 (0x00000008)
Measured value overrun
0
Bit4 (0x00000010)
Loading "production setup" not successful
4
Bit5 (0x00000020)
Loading "factory setup" not successful
4
Bit6 (0x00000040)
Loading user setup not successful
2
Bit7 (0x00000080)
Saving user setup not successful
2
Bit8 (0x00000100)
ASIC error
3
Bit9 (0x00000200)
Faulty configuration of the measured values transmission
2
Bit10 (0x00000400)
Loading "PCB setups" not successful
0
Bit11 (0x00000800)
Loading hardware setup not successful
4
Bit12 (0x00001000)
Limit shortfall
2
Bit13 (0x00002000)
Limit over range
2
Bit14 (0x00004000)
Error in the receive queue of the CAN handler.
3
Bit15 (0x00008000)
Error during start-up of the SAE J1939 controller.
4
4.3 Carry out configuration
To read or write the settings, the master sends a message with the parameter group number
PGN 61184 (0x00EF00) "Proprietary A" to the HPT's address. The HPT always responds to
the inquiry using the same PGN (parameter group number). The structure of the response
corresponds with the inquiry and always contains an Acknowledge code (see chapter 4.5.1
Description "ack" (Acknowledge Code) of the configuration message). In case of reading
requests the requested data which have been read out from the OL-Index are written into the
value range of the response.
This special PGN is intended for the customised communication according to SAE J1939-21.
The PGN is part of the specific parameter groups which means the "PDU Specific" part of the
PGN contains the address of the target device, in our case the device address of the sensor.

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Procedure for the permanent change of settings must be strictly adhered to:
"Start editing mode", see commands chap. 4.6.1
oReading and writing of the desired Object List Entries
...
"Saving the settings", see commands chap. 4.6.2
"Restart", see commands chap. 4.6.4
Please note:
The reading of entries from the Object List (OL) can be carried out directly.
4.4 Structure of the SAE J1939 29-BIT CAN-ID
4.4.1 Description PGN 61184 "Proprietary A"
Transmission rate
On request
Data length of the message
8
Extended Data Page (EDP)
0
Data Page (DP)
0
PDU format
239 (0xEF)
PDU specific
Sensor device address (see chapter 4.2.1 List of the
settings (Object List "OL"),OL Index 1)
Priority
6
4.4.2 CAN-ID Example for configuration communication with sensor address 1
1 1 0 0 0 (11000 binary = 18 hex)
18 EF 01 02
CAN-ID = 0x18EF0102
Priority, EDP, DP: see Table 4.4.1 Description PGN 61184 "Proprietary A"
Bitposition
29 Bit-ID
28 26 25 24 23 16 15 8 7 0
EDP DP
>=0xF0
Group Extension
Priority
Parameter Group Number (PGN)
Source Address
PDU Format
PDU Specific
< 0xF0
Destination Adress
Bitposition
29 Bit-ID
28 26 25 24 23 16 15 8 7 0
EDP DP
>=0xF0
Group Extension
Priority
Parameter Group Number (PGN)
Source Address
PDU Format
PDU Specific
< 0xF0
Destination Adress

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4.5 Short description of the configuration message
The configuration message serves to read or write entries in the object list. Here, the data
range of the configuration message (PGN 61184) is subdivided as follows:
Index
Byte 1
r/w
Byte 2
dc
Byte 3
ack
Byte 4
Value
Byte 5
Byte 6
Byte 7
Byte 8
Byte
Name
Content
1
Index
Index of the object in the object list "OL"
2
r/w
Read or write access, 0=read, 1=write
3
sub
index
Sub index of the configuration (0 if no sub index is used)
4
ack
Acknowledge code, see table description of "Acknowledge Code“
5-8
Value
Used data, "Little Endian" format
For entries in which a sub index is used, i.e. 59 (status channel) a sub index
has to be set in order to inquire the channel.
4.5.1 Description "ack" (Acknowledge Code) of the configuration message
Byte 4 "ack" of the configuration message (PGN 61184) will be defined by the query
processing depending on the sensor. If requested by the master, this byte is always 0.
"ack" Byte 4
Description of "Acknowledge Code"
0
OK; always set to 0 in the case of requests
1
Parameters read only
2
Value too high
3
Value too low
4
Index does not exist
5
Error while saving parameters
6
Error while restoring parameters
7
Invalid r/w Byte (i.e. >1)
8
Parameters write only
9
Invalid data
10
Processor occupied
11
Error while accessing the hardware
12
Sub index does not exist

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4.5.2 Description of the configuration range "value"
The user data range "Value" of the configuration message will be defined using the data type
of the OL (object list). The data type defines the number of used data bytes. The number is
represented in "Little-Endian" which means the leastsignificant data byte (LSB) will be located
at the lowest address (byte 5).
Example: In a uint16 value, for example, only the first two bytes (byte 5 and byte 6)
configuration message's value range are used and interpreted as unsigned 16 bit integer
value.
Datatype
Bit
Value
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
uint8
8
LSB
x
x
x
uint16
16
LSB
MSB
x
x
uint32
32
LSB
LSB+1
LSB+2
MSB
bool8
8
LSB
x
x
x
string[4]
32
[0]
[1]
[2]
[3]
LSB: Least Significant Bit/Byte
MSB: Most Significant Bit/Byte
x Byte is not used.
4.6 Commands
Commands are a special function with the configuration They are handled via the PGN 61184
as well. In contrast to the general entries in the Object List (OL), writing on a control command
index triggers a function in the device.
4.6.1 Start editing mode
Before the settings are written, the master must set the sensor to the editing mode. This is
carried out by writing the string "edit" into the Index 101. In the editing mode, the sensor reacts
exclusively to configuration commands. The editing mode can only be finished by restart.
Prior to restarting, the changes must explicitly be saved (Index 102). If
restart is carried out without saving, all changes will be lost!
Master
Sensor
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value ("edit")
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
101
1
0
0
0x65 "e"
0x64 "d"
0x69 "i"
0x74 "t"
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
101
1
0
0
0
0
0
0

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4.6.2 Saving the settings
The changed settings will not automatically become persistent, which means, they will not be
stored permanently. For this purpose, an extra storage process needs to be carried out
explicitly. This is carried out by writing the string "save" into the Index 102.
Master
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value ("save")
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
102
1
0
0
0x73 "s"
0x61 "a"
0x76 "v"
0x65 "e"
Sensor
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
102
1
0
0
0
0
0
0
4.6.3 Reset to factory default settings
The settings can be reset to factory default settings at any time. For this purpose, the string
"load" must be written into Index 103.
Master
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value ("load")
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
103
1
0
0
0x6C "l"
0x6F "o"
0x61 "a"
0x64 "d"
Sensor
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
103
1
0
0
0
0
0
0
4.6.4 Restart
A restart is carried out by briefly disconnecting the sensor from the power supply. A restart
can also be carried out by writing the string "boot" into the index 104. This command is not
responded to by the sensor, as the software of the sensor will be reinitialised immediately.
Master
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value ("boot")
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
104
1
0
0
0x62 "b"
0x6F "o"
0x6F "o"
0x74 "t"

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4.7 Device-specific control commands
4.7.1 Auto calibration pressure - Index 37
If the value "cali" is written into the index 37, the offset will be calculated for an automatical
recalibration. The autocalibration can only be carried out if the toleranceof the user calibration
is unequal to 0.
Before the settings are written, the master has to set the sensor to the editing mode, see
chapter 4.6.1 Start editing mode.
The autocalibration itself will not be carried out before storage of the
settings and subsequent reinitialisation, see chapter 4.6.4 Restart.
If the transmitted configuration value does not correspond with "cali", a
message with Acknowledge = 4 "Index does not exist" will be sent.
Master
Sensor
Sensor –negative response -
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value ("cali")
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
37
1
0
0
0x63 "c"
0x61 "a"
0x6C "l"
0x69 "i"
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
37
1
0
0
0
0
0
0
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
37
1
0
4
0
0
0
0

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4.8 Example configuration process
The configuration message for all the following examples is the previously described PGN is
61184 (0x00EF00), in case of a successful request, the sensor responds by using the same
PGN.
4.8.1 Example: Read out profile number
All the settings of one device are combined in one profile. By reading of Index 0 of the Object
List (OL) the 2 bytes long profile number is sent, the HYDAC inclination sensor HIT sends the
profile number 4. As described earlier, the reading of the entry in the Object List is possible
directly without a prefixed command.
Master
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
0
0
0
0
0
0
0
0
Sensor
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value (4)
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
0
0
0
0
4
0
0
0
4.8.2 Example: Reading the serial number
By writing onto the OL Index 7 the serial number can be read out.
Master
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
7
0
0
0
0
0
0
0
Sensor (PGN 61184)
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value (0x12345678 [305.419.896d])
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
7
0
0
0
0x78
0x56
0x34
0x12
4.8.3 Example: Edit Baud rate
The Baud rate is set via a Baud rate index (see chapter 4.2.2 Setting of the Baud rate). The
parameter is located on the OL Index 2 of the OL. In the example the Baud rate 500 kBit/s is
set (Baud rate index 2). A new Baud rate will not be saved before the Baud rate index has
been changed, saved and the device has been restarted. As an entry will be changed in the
Object List in this example, writing must be activated previously.
Master
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value (2 = 500 kBit/s)
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
2
1
0
0
2
0
0
0
Sensor
Index
(Byte 1)
r/w
(Byte 2)
dc
(Byte 3)
ack
(Byte 4)
Value (4)
(Byte 5)
(Byte 6)
(Byte 7)
(Byte 8)
2
1
0
0
0
0
0
0