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© 2016 Axia Audio - Rev 2.0
GPIO Control Room Monitor Logic
Name
Pin
Type
Notes
INPUTS
MUTE CR Command
11
Active Low Input
Mutes CR monitors and Pre-
view speakers
DIM CR Command
12
Active Low Input
Allows external dimming of
CR monitor speakers.
Enable EXT PREVIEW Com-
mand
13
Active Low Input
Feeds External Audio Input to
PREVIEW
TALK TO EXT Command
14
Active Low Input
Turns on Talk to External
Audio.
Not used.
15
Active Low Input
OUTPUTS
CR ON AIR Lamp
1
Open Collector to Logic Com-
mon Return
Illuminates whenever CR
monitors are muted
DIM CR Lamp
2
Open Collector to Logic Com-
mon Return
Illuminates whenever control
room monitors are DIMMED
PREVIEW Lamp
3
Open Collector to Logic Com-
mon Return
Illuminates when PREVIEW is
active.
TALK TO EXT Lamp
4
Open Collector to Logic Com-
mon Return
Illuminates when Talk to
External is active.
TALK (to CR) Active Lamp
5
Open Collector to Logic Com-
mon Return
Active whenever a source has
activated its TALK (to CR)
function
POWER & COMMON
Source Common
7
Logic Common
Connect to ground of source
device or to Pin 8
Logic Common
8
Internal 5 Volt return
Can be connected to Pin 7
if source is not providing
common
Logic + 5 Volt supply
9
Logic Supply, Individually
Fused
Can be connected to Pin 10
if source is not providing
voltage; active only when
source has been assigned to
channel.
Source Supply
10
Common for all 5 inputs
Connect to power supply of
source device or to Pin 9
NOT CONNECTED
6
8 7 6 5 4 3 2 1
15 14 13 12 11 10 9
ØV (GND)
SOURCE
OUTPUT
COMMON
RETURN
OUT
5
OUT
2
OUT
3
OUT
4
OUT
1
N/C
IN
5
IN
4
IN
3
IN
2
IN
1
IN
COM
+
+5 V
POWER
SOURCE
GPIO v.”ZA” 4/2009
