Theatre Design & Technology - Winter 1987 - 28
USITT DMX512 & USITT AMX192
6.1
Ta
Receiver Parameters
Parameter
Min Typ Max Unit
Vf "Full" analog
level
4.9 5.0 5.1 Vdc
Va "Off" analog level 0.0 0.0 0.1 Vdc
Rt Analog receiver
termination, per
dimmer
20
Kahm
Ris Clock receiver
termination, per
dimmer
240
Kohm
Note: The above termination values for Rt and
Ris allow the system designer to calculate the
ideal termination for systems with fixed numbers of receivers and dimmers. In cases where
system size is not fixed, it is acceptable to under
terminate the line, but Rt should be 1.8 Kohm
minimum and Ris should be 20 Kohm minimum. In no case should the line termination be
reduced below that of 192 dimmers using the
per dimmer values in the table above.
6.2 Maximum Number of Receivers per
Data Link
The maximum number of receivers per data
link shall be 16 when using the type specified in
Figure 3. When using standard RS-422A receivers, the maximum number shall be four per
data link.
7.0 TRANSMIT TIMING
See Figure 3 for a diagram of Transmit Timing.
Timing parameters for this diagram are as
follows:
Parameter
lvIin Typ Max Unit
The following parameters define the "analog
valid" window. Analog level should be output
no later than the leading edge of the SYNC
pulse, and should be maintained for at least
50 usec.
Trs RESET Pulse
duration
Tri Reset Interframe
delay after
RESET pulse
trailing edge
Ts Dimmer SY C
pulse duration
35
40
70 usec
15
usec
6
):"-f"'E~
8
10 usec
·----:::)!"·f..'E~
2-_:
I
cuX)( -
Advance of valid
analog level
before SYNC
pulse leading
edge
Th Valid analog level
hold from
leading edge of
SYNC pulse
~.:,
: ,_,_ _.-:,"-,-,:J'----_---i::-;...::;
usec
50
usec
The following parameters define the refresh cycle. Minimum refresh cycle is a function of the
number of dimmer frames transmitted, up to a
max of 192. There is no minimum time between the start of the last dimmer frame and the
start of the next RESET frame.
192 dimmer
refresh cycle
Td Dimmer frame
duration
Tc
10
50 500 msec
50
usec
8.0 RECEIVE TIMING
See Figure 4 for a diagram of Receive Timing.
Parameters for this diagram shall be as follows:
Parameter
Min Typ Max Unit
The following parameters define the analog
"sample window" from 20 to 50 usec after
the leading edge of the SYNC pulse:
Trs RESET Pulse
duration
Tri Reset interframe
delay after
RESET pulse
trailing edge
Tav Analog Valid
delay after
dimmer SYNC
pulse leading
edge
Th Hold of valid
analog level
from leading
edge of SYNC
pulse
30
40
usec
10
3
50
70 usec
8
15 usec
usec
The following parameters define the refresh cycle. Minimum refresh cycle is a function of the
number of dimmer frames transmitted, up to a
max of 192. There is no minimum time between the start of the last dimmer frame and the
start of the next transmission for up to 500
milliseconds.
Tc
Td
'''_ :J
a
192 dimmer
refresh cycle
Dimmer frame
duration
10
50
50 500 msec
usec
...:.
9.0 NUMBER OF DIMMERS PER DATA
LINK
-'0--·',---.-
:-----,--r
26
9""'''
3 - }'1);192
TD&T . WlNTER 1987
-"el"ls'"
I
..
-,
.... ;
D,eg .. "....
Each data link shall support up to 192 dimmers.
Multiple links shall be used where larger num-
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
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Theatre Design & Technology - Winter 1987 - 14
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Theatre Design & Technology - Winter 1987 - 16
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Theatre Design & Technology - Winter 1987 - 18
Theatre Design & Technology - Winter 1987 - 19
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Theatre Design & Technology - Winter 1987 - 27
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Theatre Design & Technology - Winter 1987 - 68
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1969Dec
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1968Dec
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Oct
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
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