Specifications

PICED FAQ

Page 31

Cause

When the images are captured for transfer to the C-Touch Spectrum, they are drawn on a

background colour and then a copy of this is taken. Any pixels in the captured image in this colour

are assumed to be transparent. If a pixel in the image corresponds to the colour used for the

background, then it will be drawn as transparent.

Solution

Open the Project Details form and select the C-Touch tab. Change the Translucency Colour to a

colour which is different to any colour actually used in the project.

See also Transferred Images in the main help file.

1.3.4.2 Current Consumption

Problem

What is the current consumption of C-Touch Spectrum ?

Solution

C-Touch Spectrum draws 75mA from C-Bus regardless of the backlight state (on or off).

1.3.5 C-Bus Unit Clocks

Many C-Bus units use internal clocks, including C-Touch, Colour C-Touch, PAC, Telephone

Interface, DLT and computers running HomeGate or Schedule Plus.

When the time or date is changed by the user on one of these units, the time is broadcast onto

C-Bus. All units receive this message and change their internal clocks.

Some units have the ability to keep the correct time while the C-Bus power is off. When power is

applied again, these units will still have the correct time. These units arbitrate between themselves

to decide which will become the "time master" and that unit will broadcast the time on a regular

basis to ensure that the time on all devices remains synchronised. This also ensures that devices

(such as DLT) which do not retain the time during a power failure will also get the correct time

soon after power-up.

A brief description of the operation of the time arbitration follows :

1. Most C-Bus units which use the time have the ability to broadcast the time with a regular period.

2. At any given time, only the Time Master broadcasts the time.

3. C-Bus units which are more likely to have the accurate time broadcast the time more often. This

period is 60 minutes for HomeGate, Schedule Plus and Colour C-Touch, 90 minutes for Black and

White C-Touch and 120 minutes for the PAC.

4. Units which broadcast the time more often take over the role of Time Master from the slower

units.

5. Units with equal broadcast periods will be randomly selected to be the Time Master.

6. If a unit is not the Time Master and sees that there has not been a time message for a

considerable period, it will take over the role of Time Master.

7. If a unit is the Time Master and it sees a time message from another unit, it will let that unit

become the Time Master.

Time messages do get sent across C-Bus bridges which are in Application Connect mode.