Single Channel Ultrasonic Positioning Device

Application

Automotive Tracking and Guidance
Multipoint Robot Positioning and Guidance.
Machinery and Automation Spatial Position Feedback

Features

Range up to 16m
Max. Resolution 0.7mm

HX911P Positioning Device

The HX911P Ultrasonic Positioning Device

The HX911P is designed to operate as a point in a multipoint multidimensional positioning system. It can be setup as a pilot or a beacon via serial I/ O pins on the back of the device. The device is designed for operation under harsh industrial conditions. This device has RS485 interface by default, but it is also available with RS232 interface.

Modular Configuration

The HX911P is enclosed in standard 3/4" - 20 PVC pipe, threads are NPT American standard national pipe threads. Mounting accessories are widely available, most hardware stores carry variety of suitable fittings. By wiring the components together inside the tube like shown in the illustration below, a solidified rugged customized watertight system can be constructed for virtually any application fast and with relative ease. Sensors like the HE240TR, HE240TXRX, HE240TR, HE240TXRX, HE240STR, HE240STXRX will all work with the HX911P series.

Readily Available Modular Accessories (more information)

The figure on the right shows some parts readily available from most local hardware stores, the picture shows a HE240STR sensor, straight Hex Socket and L - socket. These are heavy duty chromed brass joints. Many other parts and pieces are available to suit most applications.

The Picture on the right shows a HX911P device and a sensor element HE240TR connected together using a L-shape female to male joint, and a hex socket connects the male side of the L-joint to the HX911P.

The Picture on the right shows a HX911P device and a sensor element HE240STR unified using a straight Hex Socket. It should be understood that it is not necessary to have the HX911P close to the sensor. It reduces probability of environmental electromagnetic interference. A long shielded cable can be used to connect the HX911P to the appropriate sensor. These fittings are available from most hardware stores

Connecting Sensors to the HX911P

The illustration on the right shows how the HX911P can be connected to a transceiver.

The figure on the right shows a transmitter and a receiver connected separatly to the HE640.

CAUTION when using SEALED SENSORS

If the HE240STR or the HE240STX is being used to transmit the sonic wave, the voltage V supplied to the sensor must not go higher than 42V peak to peak for sustained periods. The illustration on the right shows a voltage divider used to protect the sensor. The voltage V becomes

V = V(HX911P) x R2 / (R2+R1)

The values for R1 and R2 should be selected so that the voltage V stays beneath 42V peak to peak.

The HX911P Block Diagram

The illustration on the right shows the internal block structure of the HX911P units. The signal from the sensor is conditioned using an amplifier and a second order band pass filter. The output driver is a push pull type utilizing passive boost. Data is coupled via RS485 conditioner to the network.

Important: The HX911P is extremely sensitive, while connected to a computer ungrounded switcher power supplies from laptops and desktop can disturb the HX911P. In case of trouble make sure any device connected to the HX911P is well grounded. Laptops running on batteries do not disturb the unit while connected.

The communication parameters for the HX911PP485 version are

19200 baud, 8 bit, 1 stop bit, no parity. No Xon/Xoff handshaking

HX911P Enclosures PVC, IP68 compliant. Shape cylindrical Size 0.8" dia, 6" long

Wire color configuration for the HX911P. Sensor wires cable color gray 2 conductors and a shield
RED	Sonar out: transmits sonar signal max 60Vp-p
YELLOW	Sonar in: receives sonar signal
SHIELD	Signal return (Ground)
When connecting a transceiver (single element for both transmission and reception) Red and Yellow can be connected together.

Control wires cable color black: 6 conductors
Wire	Direction	HX911P
RED	Input	Power 7 to 16Vdc
GREEN	Return	Ground
BLACK	Input/Output	RS485 -
YELLOW	Input/Output	RS485 +
WHITE	Input/Output	Synchronization in/out
BLUE	Input	Auxiliary power
Electrical Specification
Parameter	Value	Units
Power	7 - 16	Volts
Average Current consumption	10	mA
Output power, resistive load	10	W(rms)