Artistic Licence DMX-Dongle II Benutzerhandbuch - Seite 15

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Status

The Status window provides the following information:

Window

Chan

The number of channels received in the last DMX frame. This

number may vary from 1 - 512 depending on the transmitting

console. It should however remain stable at a particular value

Period

The repeat time of the last two consecutive DMX frames. This

value shows how fast the console is transmitting information. As

the value increases beyond 50mS you will start to notice lamp

fades become 'lumpy'. The actual value will depend on the

console but should be about 25-30mS.

Refresh

The refresh rate is the reciprocal of the period. It is measured

in Hz and therefore shows the number of DMX frames received

per second. It should be in the range 30Hz to 40Hz.

Break

The length of the break signal. The break signal is used to

synchronise frames of DMX data. The specification requires

this value to be greater than 88uS. The actual value is console

dependent but usually in the range 100uS to 300uS. A value of

less than 88uS shows that a problem exists with the

transmitting console.

MaB

The Mark after Break length. The MaB is the time delay

between the end of the break signal and transmission of the

header code. The specification requires this value to be greater

than 8uS. The actual value is console dependant but usually

about 20uS. Prior to the 1990 upgrade to the DMX512

specification a MaB time of 4uS was allowed. This was changed

because it put an unnecessarily onerous demand on the receive

electronics. Modern receivers may not receive DMX with a MaB

time of less than 8uS.

Start

The Header code is in theory used to identify the type of data

contained in the DMX512 frame. In practice almost all

manufacturers use a zero header code irrelevant of the

intended destination of the DMX signal.

The Header code can be programmed with the F3 key. DMX-

Analysis will only display data with a matching header code.

If your DMX signal contains data with different header codes,

you can investigate the data using this field and also the Bad

Header count in the Error Log.

Artistic Licence (UK) Ltd.

DMX-Dongle User's Guide