ISO 16844-7:2015

Road vehicles — Tachograph systems — Part 7: Parameters

ISO 16844-7:2014 specifies the parameters used in the interchange of digital information between a road vehicle's tachograph system and vehicle units or a diagnostic tester, or within the tachograph system itself. The parameters are applicable for normal communication and/or diagnostic services. Parameters included in this part of ISO 16844 rely in particular on regulations stated in References [2] and [3].

Véhicules routiers — Systèmes tachygraphes — Partie 7: Paramètres

General Information

• Status: Withdrawn
• Publication Date: 12-Jan-2015
• ICS: 43.040.10 - Electrical and electronic equipment
• Technical Committee: ISO/TC 22/SC 31 - Data communication
• Drafting Committee: ISO/TC 22/SC 31/WG 4 - Network applications
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 03-May-2022

Relations

• Revised: ISO 16844-7:2022 - Road vehicles — Tachograph systems — Part 7: Parameters
• Effective Date: 23-Apr-2020
• Revises: ISO 16844-7:2004 - Road vehicles — Tachograph systems — Part 7: Parameters
• Effective Date: 04-Sep-2010

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 16844-7
Second edition
2015-01-15
Road vehicles — Tachograph
systems —
Part 7:
Parameters
Véhicules routiers — Systèmes tachygraphes —
Partie 7: Paramètres
Reference number
ISO 16844-7:2015(E)
©
ISO 2015

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ISO 16844-7:2015(E)

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© ISO 2015
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ISO 16844-7:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Symbols and abbreviated terms . 1
4 Identifier specification for diagnostic services . 2
4.1 Data identifiers (DID) . 2
4.2 Routine identifiers (RID) . 6
5 Parameters and values . 6
5.1 General . 6
5.2 Transmitted signal ranges . 6
5.3 Date and time parameter specifications . 8
5.4 Parameter specifications .12
6 DTCs for tachograph system .64
Bibliography .67
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ISO 16844-7:2015(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT), see the following URL: Foreword — Supplementary information.
This second edition cancels and replaces the first edition (ISO 16844—7:2004), which has been
technically revised.
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical
and electronic equipment.
ISO 16844 consists of the following parts, under the general title Road vehicles — Tachograph systems:
— Part 1: Electrical connectors
— Part 2: Electrical interface with recording unit
— Part 3: Motion sensor interface
— Part 4: CAN interface
— Part 5: Secured CAN interface
— Part 6: Diagnostics
— Part 7: Parameters
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ISO 16844-7:2015(E)

Introduction
This International Standard supports and facilitates the communication between electronic control units
[2]
and a tachograph. The tachograph is based upon the European Council Regulation (EC) No 561/2006
[3]
and (EEC) No 3821/85 as last amended.
The digital tachograph concept is based upon a RU storing data, related to the activities of the various
drivers driving the vehicle, on which it is installed.
During the normal operational status of the RU, data stored in its memory are accessible to different
entities (drivers, authorities, workshops, transport companies) in different ways (displayed on a screen,
printed by a printing device, downloaded to an external device). Access to stored data is controlled by
smart card inserted in the tachograph.
In order to prevent manipulation of the tachograph system, the speed signal sender (motion sensor) is
provided with an encrypted data link.
A typical tachograph system is shown in Figure 1.
Key
1 positive supply
2 battery minus
3 speed signal, real time
4 data signal in/out
Figure 1 — Typical tachograph system
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INTERNATIONAL STANDARD ISO 16844-7:2015(E)
Road vehicles — Tachograph systems —
Part 7:
Parameters
1 Scope
This part of ISO 16844 specifies the parameters used in the interchange of digital information between
a road vehicle’s tachograph system and vehicle units or a diagnostic tester, or within the tachograph
system itself. The parameters are applicable for normal communication and/or diagnostic services.
Parameters included in this part of ISO 16844 rely in particular on regulations stated in References [2]
and [3].
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 14229-1, Road vehicles — Unified diagnostic services (UDS) — Part 1: Specification and requirements
ISO 16844-4, Road vehicles — Tachograph systems —Part 4: CAN interface
ISO 16844-6, Road vehicles — Tachograph systems —Part 6: Diagnostics
ISO/IEC 8859 (all parts), Information technology — 8-bit single-byte coded graphic character sets
3 Symbols and abbreviated terms
CAN controller area network
Cvt convention
DID data identifier
DTC diagnostic trouble code
ECU electronic control unit
M mandatory
n/a not applicable
R accessible in reading using diagnostic services
RID routine identifier
RMS registering member state
R/W accessible in reading and writing, using diagnostic services
SJW resynchronisation jump width
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ISO 16844-7:2015(E)

t time quantum
q
U user option
UTC universal time coordinated
VIN vehicle identification number
VRN vehicle registration number
4 Identifier specification for diagnostic services
4.1 Data identifiers (DID)
The DIDs used in the diagnostic services ReadDataByIdentifier WriteDatatByIdentifier and
InputOutputControlByIdentifier specified in ISO 16844-6 shall be supported in accordance with Table 1.
The DIDs shall be implemented as specified in Clause 5.
In general,
— assignment of identifiers shall comply with the definitions given in ISO 14229-1,
— undefined identifiers in the range of tachograph IDs from F900 to F9FF shall be reserved for
16 16
future use, and
— all identifiers in the range of F180 to F1A0 shall be implemented as specified in ISO 14229-1 if
16 16
not specified in Clause 5.
Table 1 — Data identifier
Value Simplified Specified
Data Identifier name Cvt Access
[Hex] mnemonic in section
VehicleManufacturerSparePartNumber F187 U VMSPN R/W —
VehicleManufacturerECUSoftwareNumber F188 U VMECUSWN R/W —
VehicleManufacturerECUSoftwareVersionNumber F189 U VMECUSWVN R/W —
SystemSupplierIdentifier F18A M SSID R —
ECUManufacturingDate F18B M ECUMD R —
ECUSerialNumber F18C M ECUSN R —
VehicleIdentificationNumber F190 M VIN R/W 5.4.2
VehicleManufacturerECUHardwareNumber F191 M VMECUHWN R/W —
SystemSupplierECUHardwareNumber F192 M SSECUHWN R —
SystemSupplierECUHardwareVersionNumber F193 M SSECUHWVN R —
SystemSupplierECUSoftwareNumber F194 M SSECUSWN R —
SystemSupplierECUSoftwareVersionNumber F195 M SSECUSWVN R —
ExhaustRegulationOrTypeApprovalNumber F196 M EROTAN R —
SystemNameOrEngineType F197 U SNOET R/W —
RepairShopCodeOrTesterSerialNumber F198 U RSCOTSN R/W —
ProgrammingDate F199 U PD R/W —
CalibrationRepairShopCodeOrCalibrationEquipementSerialNumber F19A M CRSCOCESN R/W —
CalibrationDate F19B M CD R/W —
CalibrationEquipmentSWNumber F19C M CESWN R/W —
ECUInstallationDate F19D M EID R/W —
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ISO 16844-7:2015(E)

Table 1 (continued)
Value Simplified Specified
Data Identifier name Cvt Access
[Hex] mnemonic in section
ODXFileIdentifier F19E U OFID R/W —
RemoteSessionDiagnsosticSessionType F900 M RSDST R/W
TachographVehicleSpeed F902 M TVS R 5.4.12
Driver1WorkingState F903 M D1WS R 5.4.13
Driver2WorkingState F904 M D2WS R 5.4.14
DriveRecognize F905 M DR R 5.4.15
Driver1TimeRelatedStates F906 M D1TRS R 5.4.16
Driver2TimeRelatedStates F909 M D2TRS R 5.4.17
DriverCardDriver1 F907 M DCD1 R 5.4.18
DriverCardDriver2 F90A M DCD2 R 5.4.19
OverSpeed F908 M OS R 5.4.20
TimeDate F90B M TD R/W 5.4.21
ResetHeartbeatMessage F90C M RHM R/W 5.4.22
AdjustLocalMinuteOffset F90D M ALMO R/W 5.4.23
AdjustLocalHourOffset F90E M ALHO R/W 5.4.24
PriorityLevelOfTCO1Message F90F M PLOTM R/W 5.4.25
HighResolutionTotalVehicleDistance F912 M HRTVD R/W 5.4.26
HighResolutionTripDistance F913 M HRTD R/W 5.4.27
ServiceComponentIdentification F914 M SCI R 5.4.28
ServiceDelayCalendarTimeBased F915 M SDCTB R 5.4.29
Driver1Identification F916 M D1I R 5.4.30
Driver2Identification F917 M D2I R 5.4.31
KFactor F918 M KF R/W 5.4.32
SpeedMeasurementRange F919 M SMR R 5.4.33
NumberOfTeethOnPhonicWheel F91A U NOTOPW R/W 5.4.34
TachographOutputShaftSpeed F91B M TOSS R 5.4.35
LFactorTyreCircumference F91C M LFTC R/W 5.4.36
WVehicleCharacteristicFactor F91D M WVCF R/W 5.4.37
PulsesPerRevolutionOfOutputShaft F91E M PPROOS R/W 5.4.38
TransmissionRepetitionRateOfTCO1Message F920 M TRROTM R/W 5.4.39
TyreSize F921 M TS R/W 5.4.40
NextCalibrationDate F922 M NCD R/W 5.4.41
Driver1ContinuousDrivingTime F923 M D1CDT R 5.4.42
Driver2ContinuousDrivingTime F924 M D2CDT R 5.4.43
Driver1CumulativeBreakTime F925 M D1CBT R 5.4.44
Driver2CumulativeBreakTime F926 M D2CBT R 5.4.45
Driver1CurrentDurationOfSelectedActivity F927 M D1CDOSA R 5.4.46
Driver2CurrentDurationOfSelectedActivity F928 M D2CDOSA R 5.4.47
SpeedAuthorised F92C M SA R/W 5.4.48
TachographCardSlot1 F930 M TCS1 R 5.4.49
TachographCardSlot2 F933 M TCS2 R 5.4.50
Driver1Name F931 M D1N R 5.4.51
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Table 1 (continued)
Value Simplified Specified
Data Identifier name Cvt Access
[Hex] mnemonic in section
Driver2Name F932 M D2N R 5.4.52
OutOfScopeCondition F936 M OOSC R 5.4.53
ModeOfOperation F937 M MOO R 5.4.54
Driver1CumulatedDrivingTimePreviousAndCurrentWeek F938 M D1CDTPACW R 5.4.55
Driver2CumulatedDrivingTimePreviousAndCurrentWeek F939 M D2CDTPACW R 5.4.56
RealTimeSpeedPulses F940 M RTSP R/W 5.4.57
EngineSpeed F95A U ES R 5.4.58
CalibrationInputOutput F960 M CIO R 5.4.59
SynchronizationJumpWidth F979 M SJW R/W 5.4.60
SamplePoint F97A M SP R/W 5.4.61
TimeOutMessageErrorDelay F97B M TOMED R/W 5.4.62
ErrorManagementInitialisationInhibition F97C M EMII R/W 5.4.63
RegisteringMemberState F97D M RMS R/W 5.4.64
VehicleRegistrationNumber F97E M VRN R/W 5.4.65
VehicleRegistrationDate F97F M VRD R/W 5.4.66
Driver1PreferredLanguage F981 U D1PL R/W 5.4.67
Driver2PreferredLanguage F982 U D2PL R/W 5.4.68
DriverCard1DownloadTimePeriod F990 U DC1DTP R 5.4.69
DriverCard2DownloadTimePeriod F983 U DC2DTP R 5.4.70
TachographDownloadTimePeriod F991 U TDTP R 5.4.71
DriversHoursRulesPreWarningTimeDelay F992 U DHRPWTD R/W 5.4.72
DriverCardExpiryWarningTimeDelay F993 U DCEWTD R/W 5.4.73
NextDriverCard1DownloadWarningTimeDelay F994 U NDC1DWTD R/W 5.4.74
NextDriverCard2DownloadWarningTimeDelay F984 U NDC2DWTD R/W 5.4.75
NextTachographDownloadWarningTimeDelay F995 U NTDWTD R/W 5.4.76
NextCalibrationWarningTimeDelay F996 U NCWTD R/W 5.4.77
Driver1EndOfLastDailyRestPeriod F997 U D1EOLDRP R 5.4.78
Driver2EndOfLastDailyRestPeriod F985 U D2EOLDRP R 5.4.79
Driver1EndOfLastWeeklyRestPeriod F998 U D1EOLWRP R 5.4.80
Driver2EndOfLastWeeklyRestPeriod F986 U D2EOLWRP R 5.4.81
Driver1EndOfSecondLastWeeklyRestPeriod F999 U D1EOSLWRP R 5.4.82
Driver2EndOfSecondLastWeeklyRestPeriod F987 U D2EOSLWRP R 5.4.83
Driver1CurrentDailyDrivingTime F99A U D1CDDT R 5.4.84
Driver2CurrentDailyDrivingTime F988 U D2CDDT R 5.4.85
Driver1CurrentWeeklyDrivingTime F99B U D1CWDT R 5.4.86
Driver2CurrentWeeklyDrivingTime F989 U D2CWDT R 5.4.87
Driver1TimeLeftUntilNewDailyRestPeriod F99C U D1TLUNDRP R 5.4.88
Driver2TimeLeftUntilNewDailyRestPeriod F98A U D2TLUNDRP R 5.4.89
Driver1CardExpiryDate F99D U D1CED R 5.4.90
Driver2CardExpiryDate F98B U D2CED R 5.4.91
Driver1CardNextMandatoryDownloadDate F99E U D1CNMDD R 5.4.92
Driver2CardNextMandatoryDownloadDate F98C U D2CNMDD R 5.4.93
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ISO 16844-7:2015(E)

Table 1 (continued)
Value Simplified Specified
Data Identifier name Cvt Access
[Hex] mnemonic in section
TachographNextMandatoryDownloadDate F99F U TNMDD R 5.4.94
Driver1TimeLeftUntilNewWeeklyRestPeriod F9A1 U D1TLUNWRP R 5.4.95
Driver2TimeLeftUntilNewWeeklyRestPeriod F98D U D2TLUNWRP R 5.4.96
Driver1NumberOfTimes9hDailyDrivingTimesExceeded F9A0 U D1NOT9HDDTE R 5.4.97
Driver2NumberOfTimes9hDailyDrivingTimesExceeced F98E U D2NOT9HDDTE R 5.4.98
Driver1CumulativeUninterruptedRestTime F9A2 U D1CURT R 5.4.99
Driver2CumulativeUninterruptedRestTime F98F U D2CURT R 5.4.100
Driver1MinimumDailyRest F9A3 U D1MDR R 5.4.101
Driver2MinimumDailyRest F9A7 U D2MDR R 5.4.102
Driver1MinimumWeeklyRest F9A4 U D1MWR R 5.4.103
Driver2MinimumWeeklyRest F9A8 U D2MWR R 5.4.104
Driver1MaximumDailyPeriod F9A5 U D1MDP R 5.4.105
Driver2MaximumDailyPeriod F9A9 U D2MDP R 5.4.106
Driver1MaximumDailyDrivingTime F9A6 U D1MDDT R 5.4.107
Driver2MaximumDailyDrivingTime F9AA U D2MDDT R 5.4.108
Driver1NumberOfUsedReducedDailyRestPeriods F9AB U D1NOURDRP R 5.4.109
Driver2NumberOfUsedReducedDailyRestPeriods F9AC U D2NOURDRP R 5.4.110
Driver1RemainingCurrentDrivingTime F9AD U D1RCDT R 5.4.111
Driver2RemainingCurrentDrivingTime F9AE U D2RCDT R 5.4.112
Driver1RemainingDrivingTimeOnCurrentShift F9AF U D1RDTOCS R 5.4.113
Driver2RemainingDrivingTimeOnCurrentShift F9B0 U D2RDTOCS R 5.4.114
Driver1RemainingDrivingTimeOfCurrentWeek F9B1 U D1RDTOCW R 5.4.115
Driver2RemainingDrivingTimeOfCurrentWeek F9B2 U D2RDTOCW R 5.4.116
Driver1Remaining2WeeksDrivingTime F9B3 U D1R2WDT R 5.4.117
Driver2Remaining2WeeksDrivingTime F9B4 U D2R2WDT R 5.4.118
Driver1TimeLeftUntilNextDrivingPeriod F9B5 U D1TLUNDP R 5.4.119
Driver2TimeLeftUntilNextDrivingPeriod F9B6 U D2TLUNDP R 5.4.120
Driver1DurationOfNextDrivingPeriod F9B7 U D1DONDP R 5.4.121
Driver2DurationOfNextDrivingPeriod F9B8 U D2DONDP R 5.4.122
Driver1DurationOfNextBreakRest F9B9 U D1DONBR R 5.4.123
Driver2DurationOfNextBreakRest F9BF U D2DONBR R 5.4.124
Driver1RemainingTimeOfCurrentBreakRest F9C0 U D1RTOCBR R 5.4.125
Driver2RemainingTimeOfCurrentBreakRest F9C1 U D2RTOCBR R 5.4.126
Driver1RemainingTimeUntilNextBreakOrRest F9C2 U D1RTUNBOR R 5.4.127
Driver2RemainingTimeUntilNextBreakOrRest F9C3 U D2RTUNBOR R 5.4.128
Driver1OpenCompensationInTheLastWeek F9C7 U D1OCITLW R 5.4.129
Driver2OpenCompensationInTheLastWeek F9C8 U D2OCITLW R 5.4.130
Driver1OpenCompensationInWeekBeforeLast F9C9 U D1OCIWBL R 5.4.131
Driver2OpenCompensationInWeekBeforeLast F9CA U D2OCIWBL R 5.4.132
Driver1OpenCompensationIn2ndWeekBeforeLast F9CB U D1OCI2WBL R 5.4.133
Driver2OpenCompensationIn2ndWeekBeforeLast F9CC U D2OCI2WBL R 5.4.134
Driver1AdditionalInformation F9CD V D1AI R 5.4.135
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ISO 16844-7:2015(E)

Table 1 (continued)
Value Simplified Specified
Data Identifier name Cvt Access
[Hex] mnemonic in section
Driver2AdditionalInformation F9CE V D2AI R 5.4.136
StandardRevision F9CF M SD R 5.4.1
4.2 Routine identifiers (RID)
The RIDs used in the diagnostic services RoutineControlByIdentifier specified in ISO 16844-6 shall be
in accordance with Table 2.
Table 2 — Routine identifiers
Routine identifier Value Cvt Simplified mnemonic
MotionSensorVehicleUnitPairing 014F U MSVUP
16
DisplayTest 0150 U DT
16
LCDNegativeModeTest 0151 U LNMT
16
PrinterTest 0152 U PT
16
HardwareTest 0153 U HT
16
CarderReaderTest 0154 U CRT
16
Reserved by document 0155 U RBD
16
ButtonTestLoop 0156 U BTL
16
CodeTest 0158 U CT
16
RemoteTachographCardDataTransfer 0180 U RTCDT
16
5 Parameters and values
5.1 General
The parameters specified in this section shall be implemented as specified in 5.4 with the general
definitions given in 5.2.
All parameters that are referenced in Table 1 or Table 2 shall be supported by diagnostic communication
as specified in ISO 16844-6. Parameters supported for normal communication are referenced in
ISO 16844-4.
5.2 Transmitted signal ranges
For the ranges used to determine the validity of a transmitted signal, see Table 3. For the ranges used to
denote the state of a discrete parameter, see Table 4. For the ranges used to denote the state of a control
mode command, see Table 5.
— The values of the error indicator range shall be used to immediately indicate that valid parameter
data are currently not available due to error in the sending component (e.g. sensor, subsystem, or
module).
— The values in the not available range shall be used to transmit a message which contains a parameter
that is not available or not supported in the module.
— The values in the don’t care/take no action range shall be used to transmit a command message and
identify those parameters where no response is expected from the receiving device.
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ISO 16844-7:2015(E)

— The values in the range Parameter specific indicator may be used for individual indicators for a
parameter. In this case, it is part of the parameter specification.
If a component failure prevents the transmission of valid data of a parameter, the error indicator as
specified in Table 3 and Table 4 shall be used instead of the parameter data. However, the error indicator
shall not be used if the measured or calculated data have yielded a value but exceed the specified
parameter range. Instead, the data shall be transmitted using the appropriate minimum or maximum
parameter value.
When a specified parameter of this part of ISO 16844 is transmitted using diagnostic services, padding
bits shall be added to increase its length to the next integer number of bytes in the case where its length
is not an integer number of bytes. This padding shall be made by setting the relevant most significant
bits to zero.
EXAMPLE Driver1WorkingStates, DID F003 , 3-bit length: when this parameter value is 010 , it is
16 2
transmitted as one byte of the value of 02 .
16
Table 3 — Transmitted signal ranges
Range name 1 byte 2 byte 4 bytes ASCII
0 to 250 0 to 64255 0 to 4211081215 1 to 254
10 10 10 10 10 10 10 10
Valid signal
0 to FA 0 to FAFF 0 to FAFFFFFF 0 to FE
16 16 16 16 16 16 16 16
251 64256 to 64511 4211081216 to 4227858431
10 10 10 10
Parameter specific
None
indicator
FB FB00 to FBFF FB00 to FDFF
16 16 16 16 16
252 to 253 64512 to 65023 4211081216 to 4261412863
10 10 10 10 10 10
Reserved for
None
future indicators
FC to FD FC00 to FDFF FC000000 to FDFFFFFF
16 16 16 16 16 16
254 65024 to 65279 4261412864 to 4278190079
10 10 10 10 10
Error indicator 0
FE FE00 to FEFF FE000000 to FEFFFFFF
16 16 16 16 16
255 65280 to 65535 4278190080 to 4294967294 255
10 10 10 10 10 10
Not available or
not requested
FF FF00 to FFFF FF000000 to FFFFFFFF FF
16 16 16 16 16 16
Table 4 — Transmitted values for discrete parameters (measured)
Range name Transmitted value
Disabled (off, passive, insufficient) 00
2
Enabled (on, active, sufficient) 01
2
Error indicator 10
2
Not available or not installed 11
2
Table 5 — Transmitted values for control requests (status)
Range name Transmitted value
Command to disable function (turn off, etc.) 00
2
Command to enable function (turn on, etc.) 01
2
Reserved 10
2
Don’t care/take no action (leave function as it is) 11
2
The data type can be either status or measured.
— Status specifies the present state of a multi-state parameter or function as a result of action taken
by the transmitting node. This action is the result of a calculation which uses local and/or network
measured and/or status information.
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— Measured data convey the current value of a parameter as measured or observed by the transmitting
node to determine the condition of the specified parameter.
5.3 Date and time parameter specifications
5.3.1 General
The parameters specified in this section are used in several other parameters or parameter groups.
5.3.2 Seconds
This parameter shall indicate the component “seconds” of the current time of day. This should be reported
as the seconds of the current time at UTC; however, it may be reported as the component seconds of the
current time at a local time zone. The local hour/minute offset parameters are used to indicate if the
time of day is the current UTC time or a local time zone time. The parameter shall be implemented as
specified in Table 6.
Table 6 — Specification of parameter seconds
Attribute Value
Data length 1 byte
Resolution 0,25 s/bit
Offset 0 s
Operating range 0 s to 59,75 s
Type Measured
DID n/a, used as part of other DIDs
Access —
5.3.3 Minutes
This parameter shall indicate the component “minutes” of the current time of day. This should be
reported as the minutes of the current time at UTC; however, it may be reported as the component
minutes of the current time at a local time zone. The local hour/minute offset parameters are used to
indicate if the time of day is the current UTC time or a local time zone time. The parameter shall be
implemented as specified in Table 7.
Table 7 — Specification of parameter minutes
Attribute Value
Data length 1 byte
Resolution 1 min/bit
Offset 0 min
Operating range 0 min to 59 min
Type Measured
DID n/a, used as part of other DIDs
Access —
5.3.4 Hours
This parameter shall indicate the component “hour” of the current time of day. This should be reported
as the hours of the current time at UTC; however, it may be reported as the component hours of the
current time at a local time zone. The local hour/minute offset parameters are used to indicate if the
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ISO 16844-7:2015(E)

time of day is the current UTC time or a local time zone time. The parameter shall be implemented as
specified in Table 8.
Table 8 — Specification of parameter hours
Attribute Value
Data length 1 byte
Resolution 1 h/bit
Offset 0 h
Operating range 0 h to 23 h
Type Measured
DID n/a, used as part of other DIDs
Access —
5.3.5 Day
This parameter shall indicate the component “day” of the current time of day. This should be reported as
the day of the current time at UTC; however, it may be reported as the component day of the current time
at a local time zone. The local hour/minute offset parameters are used to indicate if the time of day is the
current UTC time or a local time zone time. The parameter shall be implemented as specified in Table 9.
Table 9 — Specification of parameter day
Attribute Value
Data length 1 byte
Resolution 0,25 d/bit
Offset 0 d
Operating range 0,25 d to 31,75 d
Type Measured
DID n/a, used as part of other DIDs
Access —
NOTE 1 A value of 0 for the day is null. The values [1, 2, 3, 4] indicate the first day of a month, the values
[5, 6, 7, 8] indicate the second day of the month, etc.
NOTE 2 This parameter does not influence or change the hours parameter above.
5.3.6 Month
This parameter shall indicate the component “month” of the current time of day. This should be reported
as the month of the current time at UTC; however, it may be reported as the component month of the
current time at a local time zone. The local hour/minute offset parameters are used to indicate if the
time of day is the current UTC time or a local time zone time. The parameter shall be implemented as
specified in Table 10.
© ISO 2015 – All rights reserved 9

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ISO 16844-7:2015(E)

Table 10 — Specification of parameter month
Attribute Value
Data length 1 byte
Resolution 1 month/bit
Offset 0 month
Operating range 1 month to 12 months
Type Measured
DID n/a, used as part of other DIDs
Access —
NOTE A value of 0 is null. A value of 1 identifies January, 2 identifies February, etc.
5.3.7 Year
This parameter shall indicate the component “year” of the current time of day. This should be reported
as the year of the current time at UTC; however, it may be reported as the component year of the current
time at a local time zone. The local hour/minute offset parameters are used to indicate if the time of day
is the current UTC time or a local time zone time. The parameter shall be implemented as specified in
Table 11.
Table 11 — Specification of parameter year
Attribute Value
Data length 1 byte
Resolution 1 year/bit
Offset 1985 year
Operating range 1985 year to 2235 year
Type Measured
DID n/a, used as part of other DIDs
Access —
NOTE A value of 0 identifies year 1985, 1 identifies year 1986, etc.
5.3.8 Local minute offset
This parameter shall indicate the component “minute” of the offset between the UTC time and date and
a local time zone time and date, and is defined as the number of minutes to add to UTC time and date to
convert into the time and date of local time zone.
— The local offset is a positive value for time zones east of the prime meridian to the International
Date Line.
— The local offset is a negative value for time zones west of the prime meridian to the International
Date Line.
The local minute offset is only applicable when the time and date parameters are reported as UTC time
and date. The parameter shall be implemented as specified in Table 12.
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ISO 16844-7:2015(E)

Table 12 — Specification of parameter local minute offset
Attribute Value
Data length 1 byte
Resolution 1 min/bit
Offset −125 min
Operating range −59 min to 59 min
Type Measured
DID n/a, used as part of other DIDs
Access —
NOTE 1 For the recording unit, it represents an offset from UTC set by the driver.
NOTE 2 The valid range is further limited by legal requirements.
5.3.9 Local ho
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