SoundAdvisor Model 831C
A-4
AC Performance
I/O Connector
Provides External Power, Analog and Digital I/O,
and enhanced capabilities for 831-INT
Mating connector
: Hirose ST40X-18S or ST60X-18S
Logic Output
: Output driven 0 to +3V through
1k
Ω
, setting selects function
Logic Input
: Input accepts 0 to +3.3V, ≈50k
Ω
load,
setting selects function
External Power
: +10 to +25 V, 500mA, self
resetting fuse
Digital Sensor Port
: Synchronous serial port for
PRM2103 and 426A12 metrics
Preamplifier Control
: Digital control lines for
preamplifier calibration check and overload
detection
Windspeed Pulse Input
: Input accepts 0 to +3
pulses from anemometer (+5V tolerant), 100k
Ω
load, setting selects function
Analog Inputs
: 3 channels, 0 to +2.5 V, 100k
Ω
load,
settings for scale and offset
I/O Connector Pinouts
The pinouts for the I/O Connector are as shown
below:
1. To enable the “Logic In, Logic Control Input” fea
-
ture, when making your own cable, pin 12 (Mains
Power Status) must be driven by a resistance
lower than about 20k
. This may be done by con
-
necting a 10k
resistor from pin 12 to either pin
13 (+2.5V, to simulate running on Mains power) or
to pin 1 or 5 (Ground, to indicate running on
external battery power). Pin 4 needs to be driven
high to assert the Logic In and pulled low to de-
assert the input. It should not be left floating.
This can be done with a momentary push-button
switch from pin 4 to pin 13 with a 10k
pull down
resistor to ground (10k
from pin 4 to pin 1 or 5).
Battery
Size
: 4 x AA size cells (LR6)
Types
: 1.5 V Alkaline, 1.2 V NiMH rechargeable, 1.5
V Photo–Lithium
0 dB Gain
20 dB Gain
AC Output
Setting
Output re
input (dB)
Maximum*
(dB re 20
µPa)
Maximum*
(dB re 20
µPa)
Off
Off
Off
Off
Out + 0 dB
-16.5
140
120
Out +20 dB
-36.5
120
100
Out +40 dB
-56.5
100
80
Preamp 10V
0.0
140
120
* Results for typical 377B02 microphone, actually
sensitivity effects results
Pin #
Description
Signal Type
1
Ground, Digital and Power
Supply
Ground
2
Logic Out 1, Logic Control
Output
Output, 0 to +2.7 V
3
831 Activity
Output, 0 to +2.7 V
4
Logic In, Logic Control Input
Input, 0 to +5 V
5
Ground, Digital and Power
Supply
Ground
6, 7
Vext, External Power Input
Input, +10.8 to +30
V, 0.5 A
auto-resetting PTC
fuse
8
SensorClk_L, LD 426A12
digital sensor clock
Output, open
drain, +20 V max.
open and 50 mA
max. closed
9
SensorDIO, LD 426A12 digital
sensor data
Bi-directional, +2.7
to +5 V logic, open
drain
10
CalOn_H, LD 426A12
calibration signal on
Output, 0 to +2.7 V
11
Ovld, LD 426A12 overload
detection signal
Input, 0 to +5 V
12
Mains Power Status; OK
when +2.7 V
Input, 0 to +2.7 V
13
+2.7 V to supply logic
switches
Output, +2.7 V
through 220
14
Wind Speed In, Pulse input
for wind speed sensors
Input, +5 Vpp max.
15
Vwthr1, Analog to Digital
Converter Input, Wind
Direction
Input, 0 to +2.048 V,
100k
load, scale
with series resistor
16
Vwthr2, Analog to Digital
Converter Input,
Temperature
17
Vwthr3, Analog to Digital
Converter Input, Humidity
18
Analog Ground, Signal
ground for pins 15 through
17
Ground
Pin #
Description
Signal Type
