724-746-5500 | blackbox.com
Page 15
ACXMODH User Manual
Chapter 3: Installation and Operation
3. Installation and Operation
3.1 Power Requirements
Each chassis supplies 5 VDC to the modular transmitter and receiver cards, but the current draw will vary depending on the cards
that are installed. When designing or building the DKM FX Modular transmitter and receiver chassis, keep in the mind the power
requirements for each card and verify the chassis that is being used can support the current draw. If you find that you need more
power to drive the cards, you may need to use a chassis that supports redundant/load sharing power inputs. These chassis that
support redundant/load sharing power inputs when active, will perform the following actions:
Redundancy When both power inputs are active and supplying power to the chassis, if one power input is disconnected,
or fails, the remaining power input will continue to supply power to the cards for seamless operation. When
you find that one of the redundant power supplies goes bad or fails, be sure to quickly replace it so you can
enjoy all of the benefits of having redundancy on the DKM FX solution.
Load Sharing You can use both power inputs for load sharing. For example, when you use the ACXMODH2R-R2 chassis
(which can supply 5 VDC @ 3 Amps) with the USB 2.0 receiver card ACX1MR-U2-C (which can consume up
to 2.5 Amps of current) and you install a second ACX1MR-U2-C USB 2.0 receiver card, the total current draw
will be -5 Amps. If you only have one power supply input that can only support up to 3 Amps of draw, the
power supply will get extremely hot and eventually fail. In a situation like this, use a power supply (or use the
load sharing technology) that can support the current draw of the installed cards.
Use the chart below to understand how much power is used on each card.
Interface Cards Power Requirements per Card
Single-Head devices (for example, ACX1MT-DHID-C) 800 mA
VGA devices (for example, ACX1MT-DVHID-C) 900 mA
USB 2.0 devices (for example, ACX1MT-U2-C) 2,500 mA
Daughter Cards Power Requirements per Card
Analog Audio/Serial Daughter Card 300 mA
Serial (RS-422) Daughter Card 150 mA
Digital Audio Daughter Card 300 mA
USB-HID Daughter Card 300 mA
PS/2 Daughter Card 650 mA
USB 2.0 embedded Daughter Card 1,100 mA
