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Crane Digital
Crane Remote Control's Signal Transmission
The crystal controlled transmitter uses an 8-bit micro-controller, operating at 2.5 MHz, to scan the command switches. All major function switches must be in the center or "off" position before the crane remote control Main Contactor can be energized. When the transmitter is"on" and the command switches are "off" or centered, then the transmitter actually sendsa "stop" command to the system. Motion can occur only with the removal of the "stop" command and the addition of a speed point/directional command within a certain timesequence. Using the key-switch to turn off the transmitter power causes the transmitter tosend five consecutive "E-STOP" messages before shutting down.
The switch position data is transmitted as a digital signal at the licensed frequency, using Manchester II coding. The digital message has a specific format and is repeated 2 to9 times per second. The repeat rate is programmable. The transmitter is turned off between messages to conserve battery life and rf spectrum. This makes it possible to have several transmitters operating in the same area, on the same frequency, with practically no interference because of the different transmission rates. The unique address code of each transmitter and receiver assures that only the matching receiver responds tothe radio commands. All other signals on the same frequency are ignored.
The use of Manchester II (bi-phase) digital FM signal coding makes the message less sensitive to corruption from interference. Please consult Tech Info 31.100, page 2, for adetailed discussion on the message format and Manchester II coding.
The security of any remote control system is of the utmost importance. Crane Remote Control systems' security is enhanced through multiplechecks before any function can becomeoperational:
• The received signal must be of the properfrequency.
• The received message must have the proper address and must be in the correct format.
About the Author
Can someone give me facts on digital scales, crane scales, and bathroom scales?
Digital Scales
Traditionally a scale is a way to weigh a thing. Today digital scales are used in the fields from science and technology to your bathroom to more accurately weight materials and objects. Digital scales are used in cooking, for loading weapons, surveying, and many more things; in fact, anything that required weight can be weighed on a digital scale. The post office uses digital scales to weigh all mail, these digital scales can also be purchased for businesses the have large volume mailing needs.
Many digital scales will store previous weights so they can be used for future comparisons, etc. They also have a computer upload ability, to make recording weights easier and bypassing a lot of unnecessary paper work.
Whatever your reasons for looking into digital scales you should know that they give the most accurate information on weights available.
http://digitalscales.biz/index.htm
Crane Scales
Crane scales for overhead material weighing and handling. Hanging scales and crane scales are load and force measurement devices used for weighing during lifting, force and load testing and overload prevention. Select from integral, removable or remote displays, wireless or with cable. Now you can improve efficiency when weighing incoming raw materials.
http://crane.balances.com/scales/0/3/
Bathroom Scales
A bathroom scale is a device used to measure a person's body weight. It is referred to as a "bathroom" scale because it is normally kept in a bathroom for use before or after a shower or bath is taken.
Fast Facts
1. Common uses: To measure the weight of a person
2. Price range: $5-$3,000
3. Types:
1. Weight-balanced analog
2. Spring-balanced analog
3. Digital
4. Digital Talking
5. Lithium
How they work
On a traditional bathroom scale, the inside features a large dial with rack and pinion. The dial is moved via four levers, which work to evenly distribute the weight placed on the standing portion. When a person stands on the scale, each of these levers moves depending on weight; as the levers move they pull the dial to show the exact weight of the person.
http://www.mahalo.com/Bathroom_Scale
Hope this helps...!
Blue Crane Digital Nikon D300 training video sample