# Council Regulation (EEC) No 3821/85 of 20 December 1985 on recording equipment in road transport, Division 3: Modes of operation

Extent: E+W+S+N.I.

006 The recording equipment shall possess four modes of operation:
operational mode,
control mode,
calibration mode,
company mode.
007 The recording equipment shall switch to the following mode of operation according to the valid tachograph cards inserted into the card interface devices:
008 In these situations the recording equipment shall use only the tachograph card inserted in the driver slot.
Mode of operation
Driver slot
No card
Driver card
Control card
Workshop card
Company card
Co-driver slot
No card
Operational
Operational
Control
Calibration
Company
Driver card
Operational
Operational
Control
Calibration
Company
Control card
Control
Control
Control
Operational
Operational
Workshop card
Calibration
Calibration
Operational
Calibration
Operational
Company card
Company
Company
Operational
Operational
Company
009 The recording equipment shall ignore non-valid cards inserted, except displaying, printing or downloading data held on an expired card which shall be possible.
010 All functions listed in II.2. shall work in any mode of operation with the following exceptions:
the calibration function is accessible in the calibration mode only,
the time adjustment function is limited when not in the calibration mode,
. . . . .
the company locks management function is accessible in the company mode only,
the monitoring of control activities function is operational in the control mode only,
the downloading function is not accessible in the operational mode (except as provided for in Requirement 150), and except downloading a driver card when no other card is inserted into the VU.
011 The recording equipment can output any data to display, printer or external interfaces with the following exceptions:
in the operational mode, any personal identification (surname and first name(s)) not corresponding to a tachograph card inserted shall be blanked and any card number not corresponding to a tachograph card inserted shall be partially blanked (every odd character — from left to right — shall be blanked),
in the company mode, driver related data (requirements 081, 084 and 087) can be output only for periods where no lock exists or no other company holds a lock (as identified by the first 13 digits of the company card number),
when no card is inserted in the recording equipment, driver related data can be output only for the current and eight previous calendar days.

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Source: https://www.legislation.gov.uk/eur/1985/3821/annex/2/division/II/division/3 (the official version)
Page: https://openlegislation.uk/eu-regulation-1985-3821/annex-2/division-II/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.