ANSI E1.27-1-2006 pdf download ANSI E1.27-1 – 2006 (R2016) Entertainment Technology—Standard for Portable Control Cables for Use with ANSI E1.11 (DMX512-A) and USITT DMX512/1990 Products
3.4 Data-: signal complement.
3.5 Data Link: The physical connection between transmitting and receiving devices.
3.6 Data Link Common: the connection to circuit Common at the point of interconnection (DMX512 Port) of the product.
3.7 Declaration: Declared in a manual and optionally marked on the device.
3.8 DMX512 Port: a DMX512 signal connection point (connector or terminal strip).
3.9 Earth Ground: the common, zero potential available from the mains electricity supply and usually connected to the metal chassis of equipment. Earth Ground is referred to as Earth in Europe and Ground in the USA.
3.10 EMI: Electromagnetic Interference.
3.11 Legacy (as used in this Standard): transmitting and receiving devices complying with the original USITT DMX512 or DMX512/1990 in all aspects of those standards. (Exception: receiving devices that are not dimmers but comply with all other aspects of DMX512/1990 shall be considered to be Legacy Equipment.)
3.12 RFI: Radio Frequency Interference.
3.13 Receiver (Receiving Device): a piece of equipment that accepts a DMX512 signal.
3.14 Signal Common: the common reference conductor of the physical media (e.g., the cable shield).
3.15 Transmitting Device: a piece of equipment that produces a DMX512 signal.
4 Electrical Characteristics
4.1 Background
The data transmission rate (250 kbits/s) used by DMX512 requires the selection of a portable DMX512 cable that does not significantly distort the signal or give rise to spurious signal reflections. Cables intended for use with audio systems (such as microphone cables), while having the convenience of flexibility, availability and relative low cost, may not be suitable for use with DMX512 because of their high capacitance and incorrect characteristic impedance; at DMX512 data rates this will give rise to bit time distortion and signal reflections/overshoot.
4.2 Maximum and minimum cable lengths Maximum and minimum run lengths are specifically omitted from this standard. A number of factors, including signal quality, device operating characteristics including capacitive values, and installation environment can affect these lengths, and is beyond the scope of this standard.
4.3 Construction Portable DMX512 cables shall use twisted pair conductors. Conductors shall be of stranded construction. The raw cable used for a DMX512 cable assembly shall be declared by its manufacturer as suitable for use with EIA- 422/EIA-485/EIA-485-A systems. Shielding shall be on individual pairs or overall shielding of pairs, or both. The portable cable itself shall be flexible and rugged enough for the repeated coiling and uncoiling to which it will be subjected.
4.3.1 Cables implementing only the Primary Data Link shall consist of at least one twisted pair and be marked according to Clause 7.1.
ANSI E1.27-1-2006 pdf download
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