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©2016 Axia Audio- Rev 1.8.1
GPIO External Timer Control Logic
Name
Pin
Type
Notes
INPUTS
START Command
11
Active Low Input
Starts timer.
STOP Command
12
Active Low Input
Stops timer.
RESET Command
13
Active Low Input
Resets timer.
FREEZE Command
14
Active Low Input
Holds timer display while
active
FREEZE Lamp
15
Active Low Input
Illuminates while timer is
frozen
OUTPUTS
START Pulse
1
Open Collector to Logic Com-
mon Return
A 100 mS PULSE sent when
Timer is started.
STOP Pulse
2
Open Collector to Logic Com-
mon Return
A 100 mS PULSE sent when
Timer is stopped.
RESET Pulse
3
Open Collector to Logic Com-
mon Return
A 100 mS PULSE sent when
Timer is reset.
FREEZE Pulse
4
Open Collector to Logic Com-
mon Return
A 100 mS PULSE sent when
Timer is frozen.
Not used.
5
Open Collector to Logic Com-
mon Return
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 com-
mon
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
