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Technical Manual HE660 series |
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The Manual: This manual contains detailed information for dynamic programming control of this device, it requires some skills with low level programming. It is not essential for the average user to understand the following, all of the parameters and features can be maneuvered using the visual software control panel of your desktop, laptop, palmtop and etc. The Longitudinal Wave. Ultrasound does not behave like ordinary sound; substantially larger fraction of the ultrasonic wave is reflected of the surface. It has lesser tendencies to travel around the object or go through it, and shorter wavelengths cause sources to be more directional. Sound attenuation is caused by geometric spreading, atmospheric absorption, boundaries and turbulence. If the confine within which ultrasound is traveling, has opposing surfaces shaped such that the wave is reflected of one surface to the other; sound can hum between the walls for a long time. This is called reverberation, atmospheric absorption causes ultrasound to decay faster than audible sound. Speed of sound is generally the limiting factor for sampling rate in case of amplitude or frequency modulation, and reverberation is of extra concern for amplitude dependant systems. Speed of sound varies by a fraction of percent with moderate humidity an temperature changes. It is affected by the type and density of the medium propagating the wave. It is helpful to understand the effects of obstacles in the medium, in which the wave travels. When the wave encounters an obstacle, a combination of the following happens.
The further up the ultrasonic spectrum the wave is, the stronger is the effect of a. The further the wave is down into the audible and infra spectrum, the stronger the effects of b. and c. |
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HE660 series The HE660 series can be configured through it's serial port, it can be manipulated by and connected directly to a personal computer. Each device has a primary address and secondary address. The secondary address is always primary address + 1, the primary address is always an even number, and secondary address is always an odd number. All broadcasted data is hexadecimal, (see hexadecimal and ASCII table) but addresses and commands are binary. Addresses are in the range from 71 to 255, and commands from 0 to 48. Characters are ignored unless these directly apply, like ' carriage return ' (13), the character ' - ' (45), the character 'esc' (27) and own address. The character ' - ' ( 45) is interpreted by the devices on the network as GO for synchronous operation. Note that the only devices with variable addresses are the network devices like the HE660RS485. *** All other devices have a primary address 84. *** |
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