Technical Specification
OUTPUTS
To prevent
any
possible damage to the host computer from badly grounded peripherals, all DDMX-S2
outputs and inputs are optically isolated from the host USB bus. The I/O channels “float” electrically
relative to the USB, thereby minimizing the opportunity for ground loops.
DMX out
DDMX-S2 supports a USIIT standard DMX512 output protocol. The DDMX-S2 output will easily drive
a standard 120 ohm bus termination.
The DMX channel provides packets of 299 slots, with a 50mS inter-packet period.
The DMX port is typically equipped with a 3-pin XLR connector for easy connection to “entertainment”
style DMX packs. To connect DDMX-S2 to a USIIT standard 5-pin XLR connector for use with
“professional” style equipment, use a standard 3-pin to 5-pin adapter.
RELAY out
The
relay
is intended to switch low-power control signals like button presses, but it can also switch small
amounts of power. Do not exceed 0.5A @ 24VDC, or 0.25A @ 125VAC.
LOGIC out
Logic out
is a standard 5V, TTL level, logic signal (relative to the ground terminal).
The signal is provided in both active-high and active-low versions. Maximum load is 30mA in each state.
These signals may also be used as a differential pair with a termination load greater than 220 ohms.
SWITCH in
Switch in
is designed to sense a switch closure to ground. This input will also take a 5V TTL level signal.
Note that in keeping with a switch closure, the logic on this pin is active low. This pin is internally pulled
to 5V with a 1Kohm resister. When driving this pin externally, do not exceed 5 volts.
PHYSICAL
4.7” X 3.7” X 1.3”, weight, approximately 12oz. (12cm X 9cm X 3.5cm, 340g) with 5’ (1.5m) Type A
USB pigtail.
DDMX is built ruggedly, in a .090” thick cast aluminum box and painted with a hard powder coat to
survive years in a harsh stage environment.
POWER
DDMX-S2 is a “high current” USB peripheral, drawing up to 220mA with all outputs active and fully
loaded. As such it must be plugged directly into either a computer port or a powered USB hub. Your
power source must provide at least 4.5 Volts.
DDMX should not be plugged into a unpowered USB hub. USB peripherals send their power
requirements to the system on initialization, and unpowered hubs are supposed to reject
peripherals that do not identify as “low current”, that is, any peripherals that require more than
100mA.
Dragonframe DDMX-S2 User Guide
Pg. 5
Содержание DDMX-S2
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