Theatre Design & Technology - Winter 1987 - 27
USITI DMX512 & USITT AMX192
2. Transmit Timing. Controllers or other transmitting device that adhere to these timing
requirements should be able to communicate with most existing dimmers that use
the different variations of the original ::>trand
protocol.
5.0 DRIVER ELECTRICAL
CHARACTERISTICS
See Figure 1 for a description of differential
clock driver and analog driver circuits. It is
strongly recommended that these circuits be
utilized in order to insure compatibility with
existing equipment.
There are substantial differences between the
receive timing and the transmit timing. ew
controllers adhering to this standard must produce a signal acceptable to a wide variety of
di=ers, and new dimmers must be able to
listen to a number of different controller signals. As an example, note that new consoles
should provide a wide "analog valid" window,
but new dimmers must be able to cope with the
differences in existing consoles and use a narrow "sample window." These differences in
timing between the Receive standard and the
Transmit standard produce enough tolerance to
cover worst-case variations on the original
Strand protocol.
Although widespread adoption of this standard is sought by USITT, compliance with the
standard is strictly voluntary. Furthermore, it is
not intended as a replacement for existing protocols already manufactured, but rather as an
addition to existing protocols which will
broaden the installed base of controllers and
dimmers that can communicate with each
other.
5.1
Parameter
Vf "Full" analog
level
Vo "Off" analog level
Ro Analog Driver
Output
impedance
Maximum analog
dri ver safe short
circuit duration
Vhi Differential Clock
Low level
Vlo Differential Clock
Hi level
Ros Clock Driver
output
impedance
Min Tvp Max Unit
4.9
0.0
5.0
0.0
5.1
0.1
100
Vdc
Vdc
ohms
unlimited
4.0
Vdc
1.0
Vdc
100
ohms
Note: Differential clock driver shall conform to
RS-422A specifications and be connected to the
line through 100 ohm series resistors. Above
voltage and impedance values for the clock
driver are for reference only.
3.0 CROSS REFERENCE
6.0 RECEIVER ELECTRICAL
CHARACTERISTICS
See EIA standards RS-422A and RS-4 5 available from:
See Figure 2 for a description of recommended
analog and differential clock receiver circuits. It
is strongly recommended that these circuits be
utilized in order to insure compatibility with
existing equipment. In cases where no more
than four receivers will be connected to the data
link, use of standard RS-422A receivers shall be
perrni tted.
Electronic Industries Association
Standards Sales Office
2001 Eye Street NW
Washington, DC 20006
4.0 TRANSMISSION MEDIUM
Data transmission shall be via a four conductor
control cable with conductors designated as
follows:
ANALOG LEVEL
SIG AL COMMO
DIFFERE TIAL CLOCK TRUE (CLOCK + I
DIFFERE TIAL CLOCK COMPLEMENT
(CLOCK -)
Analog dimmer control levels shall be time
multiplexed on the A ALOG line, referenced
to the SIGNAL COMMO line. These levels
shall vary from a to -:; VDC representing dimmer Output levels from a to 100% Synchronization of the controller (transmitting device) and
the dimmer (receiving device) shall be via clock
pulses on the DIFFERENTIAL CLOCK TRUE
and DIFFERE TIAL CLOCK COMPLEME T
lines.
Driver Parameters
.. 8 O(O... ~
ANALOG
~,
"
10 <:).... -
'--~-~\.//
CA32
Table of Contents for the Digital Edition of Theatre Design & Technology - Winter 1987
Contents
Theatre Design & Technology - Winter 1987 - 1
Theatre Design & Technology - Winter 1987 - 2
Theatre Design & Technology - Winter 1987 - 3
Theatre Design & Technology - Winter 1987 - Contents
Theatre Design & Technology - Winter 1987 - 5
Theatre Design & Technology - Winter 1987 - 6
Theatre Design & Technology - Winter 1987 - 7
Theatre Design & Technology - Winter 1987 - 8
Theatre Design & Technology - Winter 1987 - 9
Theatre Design & Technology - Winter 1987 - 10
Theatre Design & Technology - Winter 1987 - 11
Theatre Design & Technology - Winter 1987 - 12
Theatre Design & Technology - Winter 1987 - 13
Theatre Design & Technology - Winter 1987 - 14
Theatre Design & Technology - Winter 1987 - 15
Theatre Design & Technology - Winter 1987 - 16
Theatre Design & Technology - Winter 1987 - 17
Theatre Design & Technology - Winter 1987 - 18
Theatre Design & Technology - Winter 1987 - 19
Theatre Design & Technology - Winter 1987 - 20
Theatre Design & Technology - Winter 1987 - 21
Theatre Design & Technology - Winter 1987 - 22
Theatre Design & Technology - Winter 1987 - 23
Theatre Design & Technology - Winter 1987 - 24
Theatre Design & Technology - Winter 1987 - 25
Theatre Design & Technology - Winter 1987 - 26
Theatre Design & Technology - Winter 1987 - 27
Theatre Design & Technology - Winter 1987 - 28
Theatre Design & Technology - Winter 1987 - 29
Theatre Design & Technology - Winter 1987 - 30
Theatre Design & Technology - Winter 1987 - 31
Theatre Design & Technology - Winter 1987 - 32
Theatre Design & Technology - Winter 1987 - 33
Theatre Design & Technology - Winter 1987 - 34
Theatre Design & Technology - Winter 1987 - 35
Theatre Design & Technology - Winter 1987 - 36
Theatre Design & Technology - Winter 1987 - 37
Theatre Design & Technology - Winter 1987 - 38
Theatre Design & Technology - Winter 1987 - 39
Theatre Design & Technology - Winter 1987 - 40
Theatre Design & Technology - Winter 1987 - 41
Theatre Design & Technology - Winter 1987 - 42
Theatre Design & Technology - Winter 1987 - 43
Theatre Design & Technology - Winter 1987 - 44
Theatre Design & Technology - Winter 1987 - 45
Theatre Design & Technology - Winter 1987 - 46
Theatre Design & Technology - Winter 1987 - 47
Theatre Design & Technology - Winter 1987 - 48
Theatre Design & Technology - Winter 1987 - 49
Theatre Design & Technology - Winter 1987 - 50
Theatre Design & Technology - Winter 1987 - 51
Theatre Design & Technology - Winter 1987 - 52
Theatre Design & Technology - Winter 1987 - 53
Theatre Design & Technology - Winter 1987 - 54
Theatre Design & Technology - Winter 1987 - 55
Theatre Design & Technology - Winter 1987 - 56
Theatre Design & Technology - Winter 1987 - 57
Theatre Design & Technology - Winter 1987 - 58
Theatre Design & Technology - Winter 1987 - 59
Theatre Design & Technology - Winter 1987 - 60
Theatre Design & Technology - Winter 1987 - 61
Theatre Design & Technology - Winter 1987 - 62
Theatre Design & Technology - Winter 1987 - 63
Theatre Design & Technology - Winter 1987 - 64
Theatre Design & Technology - Winter 1987 - 65
Theatre Design & Technology - Winter 1987 - 66
Theatre Design & Technology - Winter 1987 - 67
Theatre Design & Technology - Winter 1987 - 68
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