Glossary - Barco UDM Series User Manual

Glossary

HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the energy
per surface unit becomes lower than the applicable exposure limit on the cornea or on the skin. The light beam
is considered (to be) unsafe for exposure if the distance from a person to the light source is less than the HD.
HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the energy
per surface unit becomes lower than the applicable exposure limit on the cornea or on the skin. The light beam
is considered (to be) unsafe for exposure if the distance from a person to the light source is less than the HD.
DMX
DMX-512 Lighting protocol over RS-485 interface. Carries information of 512 channels from a lighting
controller to lighting devices. Standardized by USITT.
RS232
An Electronic Industries Association (EIA) serial digital interface standard specifying the characteristics of the
communication path between two devices using either D-SUB 9 pins or D-SUB 25 pins connectors. This
standard is used for relatively short-range communications and does not specify balanced control lines. RS-
232 is a serial control standard with a set number of conductors, data rate, word length and type of connector
to be used. The standard specifies component connection standards with regard to computer interface. It is
also called RS-232-C, which is the third version of the RS-232 standard, and is functionally identical to the
CCITT V.24 standard. Logical '0' is > + 3V, Logical '1' is < - 3V. The range between -3V and +3V is the
transition zone.
RS422
An EIA serial digital interface standard that specifies the electrical characteristics of balanced (differential)
voltage, digital interface circuits. This standard is usable over longer distances than RS-232. This signal
governs the asynchronous transmission of computer data at speeds of up to 920,000 bits per second. It is also
used as the serial port standard for Macintosh computers. When the difference between the 2 lines is < - 0.2V
that equals with a logical '0'. When the difference is > +0.2V that equals to a logical '1'..
Transport latency
The added delay in the image processing chain. The value is the number of lines relative to the output
resolution.
Latency
The total time from the first pixel is coming in on an input source, until the first light representing that pixel is
visible on the screen. This includes the transport delay. The value is normally given in milliseconds.
DHCP
Dynamic host configuration protocol. DHCP is a communications protocol that lets network administrators
manage centrally and automate the assignment of IP addresses in an organization's network. Using the
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