IEC PAS 61162-103:2006 pdf download Maritime navigation and radiocommunication equipment and systems – Digital interfaces – Part 103: Single talker and multiple listeners – New and amended sentences and Talker IDs
1 Scope
IEC 61162-1:2016 supports the transfer of data between various equipment. This document specifies more equipment Talker IDs, amends existing sentences and introduce new sentences to facilitate more functionality between equipment.
2 New content to IEC 61162-1
Field definitions
2.1 Additional field definitions are indicated in Table 1.
2.2 Approved sentences
2.2.1 DDC – Display dimming control
The DDC sentence provides controls for equipment display dimming presets. display brightness percentage and selection of colour palette.
Transmitting and receiving equipment may support unidirectional or bidirectional communications as determined by the manufacturer.
When this sentence is sent as a command and not supported or not accepted by the recipient, the receiving equipment may generate a NAK sentence response providing an appropriate “reason code”. Additionally the receiving equipment may generate a DDC status report sentence which provides the current dimming state of the receiving equipment.
NOTE The following luminance values are the preferred values to allow uniform dimming with one DDC transmitter, without the need to pre-compute and store a brightness and colour palette value for every display in a multi-display system. These values are in conformance with IEC 62288 Presentation of navigation-related information on shipborne navigational displays (ECDIS colour brightness requirements). A device with a monochrome display may adjust its display brightness to respect the colour palette selection, to match the luminance of a device with a colour display for each selected colour palette. The value 49, center position on the brightness scale, represents the calibrated position for calibrated displays.
D = Day time setting, with a luminance of the brightest colour of 80 cd/m 2 at brightness percentage value 49
K = Dusk setting, with a luminance of the brightest colour of 36 cd/m 2 at brightness percentage value 49
N = Night time setting, with a luminance of the brightest colour of 5 cd/m 2 at brightness percentage value 49
O = Non-luminous setting, without luminance at any brightness percentage value
Comments:
1) The display dimming preset field contains an indicator that may be associated with a preset dimmed level consisting of both brightness and colour palette in the receiving equipment.
D = Day time setting
K = Dusk setting
N = Night time setting
O = Non-luminous (i.e.backlighting off) setting
Actual display brightness levels for the display dimming preset indicators above are dependant upon the capabilities provided by the manufacturer of the equipment. Upon receipt of the DDC sentence, the device shall switch its display brightness and may switch to the preset value the operator or manufacturer had determined for the corresponding indicator value. If the equipment had no brightness or dimming preset capability this field would be ignored.