Advanced Sensor Research DBO433, DBO868, DBO915 User Manual

Differential Barometer OEM Module

(DBO433, DBO868, DBO915)

User Manual v 1.0

September 2020

© Advanced Sensor Research Ltd.

Overview

The DBOxxx series differential barometer OEM module provides atmospheric pressures and derived
elevations at a rover using corrections transmitted from a stationary base. In traditional systems
elevations are calculated based on pressure readings for a stand-alone unit and are subject to the errors
inherent with environmental changes in pressure.

Applications

A) Determining a floating rover elevations based on corrections (black arrow) from a fixed base. In

this application the rover outputs a corrected elevation as it is raised or lowered relative to the
ambient atmospheric pressure (blue arrows). When used inside an enclosed space such as a
building both units must be located within.

B) Determining a fixed rover pressure difference based on corrections (black arrow) from a fixed

base. In this application the rover outputs a corrected pressure (grey arrow) inside an enclosed
space such as a building (grey rectangle) relative to the ambient atmospheric pressure (blue
arrows). The base must be located outside the enclosed space.

Specifications

Accuracy: 20cm +/- = 0.024 mbar +/- (differential mode)
Current (base): 10mA (typ) @ 5VDC
Current (rover): 20mA (typ) @ 5VDC
Dimensions (L x W x H): 82mm x 32mm x 18mm
Range: 1Km (DBO433/DBO915), 5Km (DBO868)
Voltage: 3.8 – 15 VDC
Weight: 30g

Pinout

Pin Description

ROVER

Rover mode jumper selection

BASE

Base mode jumper selection

GND

Ground

VCCIN

Regulated supply (3.3

VDC)

RXD Serial data in

TXD Serial data out

DTR/RTS

Serial flow control

BAT+

Battery supply (

3.8 –

15 VDC)

Command

Description

1

Set NodeID, both base and rover must match.

2 Set

elevation datum. (rover only)

3 Set units.

Serial communication parameters are 9600bps (N,8,1). The DTR/RTS signal pin is only required
to update the firmware.

Commands

The general command syntax is command,value followed by CR+LF.

Valid range is 0 to 999.

Valid range is -9999.99 to 9999.99

Metric =0 (mb,m, C), Imperial=1 (inHg,ft, F))