INSTALLATION |
65
PDM
PDM Operator's Manual Version 2.4a • September 2019
Bypass Relays
Analog and digital XLR inputs and outputs are wired to bypass relays. In the event of a
power failure, incoming audio is connected directly to the outputs. PDM powers up in
bypass.
Always use Bypass mode when installing software updates. You can trigger this mode
with the front panel
BYPASS
button or the web interface.
GPIO
Eight parallel control inputs and eight parallel control outputs appear on the female DB-25
connector, with pinouts detailed below. Input and output functions are assigned through
the
GPIO
menu.
Inputs and outputs are opto-isolated for easy interface to other equipment. A +5v supply
and ground are also brought out to the DB-25 for simple remote controls using pushbuttons
and LED status readouts. If an output signal is a pulse, its opto-isolator will turn on for be-
tween 100ms and 1000ms (adjustable on the configuration screen). Factory default is 250ms.
The +5v supply can provide 200 mA, more than adequate for 8 LEDs and 8 logic inputs. Total
draw should not exceed this value. This supply is protected by an internal, self-resetting
thermal circuit breaker. If this breaker should trip, power off and allow several minutes for
it to reset.
Basic remote control
1.
Use the connections shown on the left side of the schematic below. At the DB-25, jump
pin 13 (input common) to pin 8 (+5v).
2.
Connect one side of an SPST NO pushbutton to pin 20 (ground); connect the other side
to pin 25 (Input 1).
3.
Add up to 7 more pushbuttons as needed, connecting one side of all to pin 13 as
common, and connecting their other sides to the individual inputs in the chart below.
Typical PDM remote input (left) and output (right) circuits. Use the jumpers shown in gray
for simple pushbutton / LED remote. Or use just the opto-isolator connections without pins 8
and 20 for interface to other equipment. DB-25 pinouts shown in bold.
*
indicates individual
DB-25 pins for separate GPIO inputs and outputs; see chart below.
Содержание PDM
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