Ac Performance Specifications; I/O Connector Specifications; I/O Connector Pinouts Specifications - Larson Davis SoundAdvisor 831C Reference Manual

A.1.10 AC Performance Specifications
AC Output Output re
Setting input (dB)
Off
Off
-16.5
Out + 0 dB
-36.5
Out +20 dB
-56.5
Out +40 dB
0.0
Preamp 10V
* Results for typical 377B02 microphone, actually
sensitivity effects results
A.1.11 I/O Connector Specifications
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 1kΩ,
setting selects function
Logic Input: Input accepts 0 to +3.3V, ≈50kΩ 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), 100kΩ load, setting
selects function
Analog Inputs: 3 channels, 0 to +2.5 V, 100kΩ load,
settings for scale and offset
A.1.12 I/O Connector Pinouts Specifications
The pinouts for the I/O Connector are as shown below:
Pin # Description
1 Ground, Digital and Power
Supply
2 Logic Out 1, Logic Control
Output
3 831 Activity
4 Logic In, Logic Control Input
SoundAdvisor Model 831C
0 dB Gain 20 dB Gain
Maximum* Maximum*
(dB re 20 (dB re 20
µPa) µPa)
Off Off
140 120
120 100
100 80
140 120
Signal Type
Ground
Output, 0 to +2.7 V
Output, 0 to +2.7 V
Input, 0 to +5 V
Pin # Description
5 Ground, Digital and Power
Supply
6, 7 Vext, External Power Input
8 SensorClk_L, LD 426A12
digital sensor clock
9 SensorDIO, LD 426A12 digital
sensor data
10 CalOn_H, LD 426A12
calibration signal on
11 Ovld, LD 426A12 overload
detection signal
12 Mains Power Status; OK
when +2.7 V
13 +2.7 V to supply logic
switches
14 Wind Speed In, Pulse input
for wind speed sensors
15 Vwthr1, Analog to Digital
Converter Input, Wind
Direction
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
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
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
resistor to ground (10k
Signal Type
Ground
Input, +10.8 to +30
V, 0.5 A
auto-resetting PTC
fuse
Output, open
drain, +20 V max.
open and 50 mA
max. closed
Bi-directional, +2.7
to +5 V logic, open
drain
Output, 0 to +2.7 V
Input, 0 to +5 V
Input, 0 to +2.7 V
Output, +2.7 V
through 220 
Input, +5 Vpp max.
Input, 0 to +2.048 V,
100k  load, scale
with series resistor
Ground
. This may be done by con-

pull down

from pin 4 to pin 1 or 5).

A-5