RC4 RC4Magic Series 3 DMXio User Manual
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Contents
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RC4Magic Series 3 DMXio User ManualPage 8DMX TerminationA DMX terminator is available within the DMXio and can be toggled on/off by pressing onebutton. The state of termination (on or off) is remembered and will be restored when poweris cycled. Note, however, that termination is not engaged when the DMXio is not poweredon.DMXio Transmitter ModeAs a transmitter, the DMXio decodes the DMX universe arriving at the DMX connector,encodes and encrypts it, and broadcasts it using Direct Sequence Spread Spectrum (DSSS)digital radio. Unlike wired DMX, the RC4 wireless signal includes error checking andcorrection codes, and is not affected by minor interruptions and interference. DMX channelsthat are changing are allocated more bandwidth than channels that are not changing, and allchannels are broadcast with appropriate speed, redundancy and accuracy.Channel Range LimitingBy default, the DMXio transmits the entire DMX universe arriving at the wired DMX datainput. The universe can be any number of channels from one to 512. The maximum numberof channels in a DMX universe is 512, but some controllers produce fewer (some commonnumbers of channels are 64, 128, and 256).To reduce wireless bandwidth consumption, it is sometimes desirable to limit the number ofDMX channels actually being transmitted. For example, if you are using RC4Magic towirelessly control two DMX4dim wireless dimmers, with a separate DMX channel assignedto each dimmer, you only need to transmit data for eight channels. If they are contiguouschannels (say, 400 – 407), then limiting the transmitter to just that range reduces wirelessbandwidth by as much as 99.98%!If you’re not sure how many channels you are using, or if you are using DMXio units for full-universe cable replacement, stay with the default settings and transmit the entire universe.DMXio Receiver ModeAs a receiver, the DMXio decodes the wireless signal from the transmitter, rebuilds the DMXuniverse, and regenerates a standard DMX signal with the same number of channels and thesame packet rate as the data going into the transmitter. DMX in and out are compliant withUSITT DMX512/1990. |
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