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HX17 Devices

The Overhead Receivers HX17RX

This device is designed to be a part of a hx17 network grid, when a USID (ultrasonic ID) from a tag is detected the receiver transmits over RS485 network the ID of the tag and the precise time of arrival. Sending the ASCII character $ at a rate of 1Mbaud on the HX17 network will clear the timers of all the devices simultaneously. Following is the result from the detection of tag 2:

<2 4 2576307>142
<2 1 2587377>148
<2 3 2588537>149
<2 2 2599700>142

The above indicates tag 2 was detected by receiver 4 at 2576307 timer counts from the reception of $ (the synchronization signal). Each timer count interval is 62.5 nanoseconds, hence the signal arrived 161019 microseconds after synchronization. The second line indicates the signal from tag 2 was received by receiver number 1 at 161711 microseconds after synchronization and etc.

Data is within the brackets shown above, following the brackets is the checksum of the string, or a single byte accumulation of the ASCII codes up to and including >.

Hx17rx is designed to work on a multi-drop network, each device checks if the line is clear before transmitting data, if the line is not clear, it waits and tries again, data collisions are rare. 

Hx17rx ultrasonic receiver

Power Supply   5 - 12 volts DC
Current Consumption Action   5mA 
Size   40 x 80 x 20 mm
Port FCC RJ11  
Com parameters 1000000,8,1,N  ASCII
The Network Reader Hx17nr

Hx17nr reads the data from the Hx17 receivers, it transmits $ periodically and listens for the response from the HX17rx receivers. The data is made available through a RS232 interface using DB9 connector. Programs like the Hx17xyzDDE, receive data through the hx17nr and use the time difference to determine the position of the ultrasonic tags at very high rates. The position is made available to other applications on the computer via DDE, and the user has the option of collecting tagID XYZ coordinates and a timestamp to a file. The file name plus the timestamp indicate time of signal reception to a resolution of 10mS. The HX17nr has a power connector on the side, this power connector will power up all the hx17 receivers on the network. Optionally the power can be supplied directly to the network through the FCC RJ11 connector found on the HX17NR. An LED on the HX17nr will toggle on or off whenever a receiver detects a tag.

Power connector input: 5-12Vdc
Current consumption: 6mA
Size: 40 x 80 x 20 mm
Communication 250K / 1M baud (ASCII)


This version of network reader behaves the same way the RS232 version above. It has no power plug on the side like the RS232 reader, it delivers power to the network from the USB port, i.e. the power to the network is delivered by the computer device. Like the HX17NR the HX17NR-USB toggles a blue LED seen through the translucent box on or off whenever a receiver connected to the FCC RJ11 box detects a tag.

see hx17xyzDDE program description
Current consumption: 8mA
Size: 40 x 80 x 20 mm
Communication 250K / 1M baud (ASCII)

The Hx17 battery transmitter/tag

HX17T is an ultrasonic transmitter; it transmits ultrasonic identification periodically. The transmission-triggering rate is selected through the bottom hole on the face of the unit. Holding the button down using toothpick or something similar lets the user select the triggering rate. An blue LED is visible through the translucent box indicating the rate of transmission. The bottom button is held down until the LED on the unit flashes, as the user continues to hold the button down the LED flashes at increasing rates, the ultrasonic identity is transmitted every time the LED flashes. It is possible to hear the transmission clicks from the ultrasonic transmitter on the device. Hexamite offers a few versions of Hx17 ultrasonic tags.

Units with cans protruding from the surface typically have a better forward range (or higher directionality). Here the range is up to 8 meters. Units with surface hole have better distribution to the sides, circular with range up to 6 meters.



See specification


Copyright 1999 [Hexamite]. All rights reserved. Revised: .