- Latest available (Revised)
- Original (As adopted by EU)
Council Regulation (EEC) No 3821/85 of 20 December 1985 on recording equipment in road transport
After exit day there will be three versions of this legislation to consult for different purposes. The legislation.gov.uk version is the version that applies in the UK. The EU Version currently on EUR-lex is the version that currently applies in the EU i.e you may need this if you operate a business in the EU.
The web archive version is the official version of this legislation item as it stood on exit day before being published to legislation.gov.uk and any subsequent UK changes and effects applied. The web archive also captured associated case law and other language formats from EUR-Lex.
There are currently no known outstanding effects for the Council Regulation (EEC) No 3821/85, Division 4.1. .
Revised legislation carried on this site may not be fully up to date. At the current time any known changes or effects made by subsequent legislation have been applied to the text of the legislation you are viewing by the editorial team. Please see ‘Frequently Asked Questions’ for details regarding the timescales for which new effects are identified and recorded on this site.
[CPR_006] Upon receiving a StartCommunication indication primitive, the VU shall check if the requested communication link can be initialised under the present conditions. Valid conditions for the initialisation of a communication link are described in document ISO 14230-2.
[CPR_007] Then the VU shall perform all actions necessary to initialise the communication link and send a StartCommunication response primitive with the positive response parameters selected.
[CPR_008] If a VU that is already initialised (and has entered any diagnostic session) receives a new StartCommunication request (e.g. due to error recovery in the tester) the request shall be accepted and the VU shall be re-initialised.
[CPR_009] If the communication link cannot be initialised for any reason, the VU shall continue operating as it was immediately prior to the attempt to initialise the communication link.
[CPR_010] The StartCommunication Request message must be physically addressed.
[CPR_011] Initialising the VU for services is performed through a ‘ fast initialisation ’ method,
there is a bus-idle time prior to any activity,
the tester then sends an initialisation pattern,
all information which is necessary to establish communication is contained in the response of the VU.
[CPR_012] After completion of the initialisation,
all communication parameters are set to values defined in Table 4 according to the key bytes,
the VU is waiting for the first request of the tester,
the VU is in the default diagnostic mode, i.e. StandardDiagnosticSession,
the calibration I/O signal line is in the default state, i.e. disabled state.
[CPR_014] The data rate on the K-line shall be 10 400 Baud.
[CPR_016] The fast initialisation is started by the tester transmitting a wake-up pattern (Wup) on the K-line. The pattern begins after the idle time on K-line with a low time of Tinil. The tester transmits the first bit of the StartCommunication Service after a time of Twup following the first falling edge.
[CPR_017] The timing values for the fast initialisation and communications in general are detailed in the tables below. There are different possibilities for the idle time:
first transmission after power on, T idle = 300 ms.
after completion of a StopCommunication Service, T idle = P3 min.
[X1After stopping communication by time-out P3 max, T idle = 0.]
Editorial Information
Timing values for fast initialisation
Parameter | minimum value | maximum value | |
---|---|---|---|
Tinil | 25 ± 1 ms | 24 ms | 26 ms |
Twup | 50 ± 1 ms | 49 ms | 51 ms |
Communication timing values
Timing parameter | Parameter description | Lower limit values (ms) | Upper limit values (ms) |
---|---|---|---|
minimum | maximum | ||
P1 | Inter byte time for VU response | 0 | 20 |
P2 | Time between tester request and VU response or two VU responses | 25 | 250 |
P3 | Time between end of VU responses and start of new tester request | 55 | 5 000 |
P4 | Inter byte time for tester request | 5 | 20 |
[CPR_018] The message format for fast initialisation is detailed in the following tables:
StartCommunication request message
Byte # | Parameter Name | Hex value | Mnemonic |
---|---|---|---|
#1 | Format byte — physical addressing | 81 | FMT |
#2 | Target address byte | EE | TGT |
#3 | Source address byte | tt | SRC |
#4 | StartCommunication Request Service | 81 | SCR |
#5 | Checksum | 00-FF | CS |
StartCommunication positive response message
Byte # | Parameter Name | Hex value | Mnemonic |
---|---|---|---|
#1 | Format byte — physical addressing | 80 | FMT |
#2 | Target address byte | tt | TGT |
#3 | Source address byte | EE | SRC |
#4 | Additional length byte | 03 | LEN |
#5 | StartCommunication Positive Response Service Id | C1 | SCRPR |
#6 | Key byte 1 | EA | KB1 |
#7 | Key byte 2 | 8F | KB2 |
#8 | Checksum | 00-FF | CS |
[CPR_019] There is no negative response to the StartCommunication Request message, if there is no positive response message to be transmitted then the VU is not initialised, nothing is transmitted and it remains in its normal operation.] ]
The Whole Regulation you have selected contains over 200 provisions and might take some time to download. You may also experience some issues with your browser, such as an alert box that a script is taking a long time to run.
Would you like to continue?
The Schedules you have selected contains over 200 provisions and might take some time to download. You may also experience some issues with your browser, such as an alert box that a script is taking a long time to run.
Would you like to continue?
Latest Available (revised):The latest available updated version of the legislation incorporating changes made by subsequent legislation and applied by our editorial team. Changes we have not yet applied to the text, can be found in the ‘Changes to Legislation’ area.
Original (As adopted by EU): The original version of the legislation as it stood when it was first adopted in the EU. No changes have been applied to the text.
Geographical Extent: Indicates the geographical area that this provision applies to. For further information see ‘Frequently Asked Questions’.
Show Timeline of Changes: See how this legislation has or could change over time. Turning this feature on will show extra navigation options to go to these specific points in time. Return to the latest available version by using the controls above in the What Version box.
Access essential accompanying documents and information for this legislation item from this tab. Dependent on the legislation item being viewed this may include:
This timeline shows the different versions taken from EUR-Lex before exit day and during the implementation period as well as any subsequent versions created after the implementation period as a result of changes made by UK legislation.
The dates for the EU versions are taken from the document dates on EUR-Lex and may not always coincide with when the changes came into force for the document.
For any versions created after the implementation period as a result of changes made by UK legislation the date will coincide with the earliest date on which the change (e.g an insertion, a repeal or a substitution) that was applied came into force. For further information see our guide to revised legislation on Understanding Legislation.
Use this menu to access essential accompanying documents and information for this legislation item. Dependent on the legislation item being viewed this may include:
Click 'View More' or select 'More Resources' tab for additional information including: