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RDM (lighting)
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RDM (lighting)
Remote Device Management (RDM) is an addition to the DMX512 control protocol for stage lighting equipment, introduced in 2006. DMX512 was developed in the late 1980s as a standard protocol for lighting consoles to communicate with dimmers, but has since been used for more complex applications, including the control of intelligent lighting fixtures. The addition of RDM addresses many of the shortcomings of DMX512, which is unidirectional with no support for metadata.
RDM revises the DMX512 standard to include bidirectional communication, and introduces additional options for the configuration of fixtures over the DMX512 network. RDM is backwards compatible with existing DMX512 devices, and requires few changes to the physical cabling of DMX512 networks.
The RDM standard was developed by the Entertainment Services and Technology Association, and is maintained as ANSI E1.20.
DMX512 has been the standard for the control of theatrical lighting devices, including intelligent lighting fixtures, since the mid-1990s. DMX512, based on the RS-485 protocol commonly used in industrial control systems, was the first universal standard for the control of stage lighting equipment.
RDM's predecessor DMX512 is a unidirectional protocol with little capacity for error reporting or automated configuration. A single cable carries one "universe" of DMX512, consisting of 512 "addresses," each of which can be assigned a value from 0 to 255. In the earliest applications of DMX512 networks, a control console would be connected to a rack of dimmers. Within the dimmer rack, a single DMX address would control the voltage level of a single dimmer from 0% to 100%.
In more complex applications involving intelligent lighting fixtures, a DMX address is assigned to each function of a fixture, with some fixtures utilizing blocks of addresses numbering in the dozens. A device's identity within the network is defined by the first address of the block it occupies, akin to a static IP address. In a standard DMX network, each fixture must be manually configured with a starting address, and the same starting address must be separately programmed into the control console.
RDM serves multiple main functions: identification, status reporting, and configuration.
Identification allows a control console to automatically detect all devices on the DMX network, distinct from their DMX address. This assists the operator in determining which of their devices have even powered on.
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RDM (lighting)
Remote Device Management (RDM) is an addition to the DMX512 control protocol for stage lighting equipment, introduced in 2006. DMX512 was developed in the late 1980s as a standard protocol for lighting consoles to communicate with dimmers, but has since been used for more complex applications, including the control of intelligent lighting fixtures. The addition of RDM addresses many of the shortcomings of DMX512, which is unidirectional with no support for metadata.
RDM revises the DMX512 standard to include bidirectional communication, and introduces additional options for the configuration of fixtures over the DMX512 network. RDM is backwards compatible with existing DMX512 devices, and requires few changes to the physical cabling of DMX512 networks.
The RDM standard was developed by the Entertainment Services and Technology Association, and is maintained as ANSI E1.20.
DMX512 has been the standard for the control of theatrical lighting devices, including intelligent lighting fixtures, since the mid-1990s. DMX512, based on the RS-485 protocol commonly used in industrial control systems, was the first universal standard for the control of stage lighting equipment.
RDM's predecessor DMX512 is a unidirectional protocol with little capacity for error reporting or automated configuration. A single cable carries one "universe" of DMX512, consisting of 512 "addresses," each of which can be assigned a value from 0 to 255. In the earliest applications of DMX512 networks, a control console would be connected to a rack of dimmers. Within the dimmer rack, a single DMX address would control the voltage level of a single dimmer from 0% to 100%.
In more complex applications involving intelligent lighting fixtures, a DMX address is assigned to each function of a fixture, with some fixtures utilizing blocks of addresses numbering in the dozens. A device's identity within the network is defined by the first address of the block it occupies, akin to a static IP address. In a standard DMX network, each fixture must be manually configured with a starting address, and the same starting address must be separately programmed into the control console.
RDM serves multiple main functions: identification, status reporting, and configuration.
Identification allows a control console to automatically detect all devices on the DMX network, distinct from their DMX address. This assists the operator in determining which of their devices have even powered on.