The reader has one or more antennas, which emit radio waves and receive signals back from the tag. The reader is also sometimes called an interrogator because it "interrogates" the tag.
3. A device that extracts and separates the information from the tag.
2. An instrument that scans curves by a graphical recorder on a continuous paper form and converts them into digital form.
Tags outside the reader field do not receive radio waves and can't be read.
The reader sends energy to the tags but the tags sit idle until the reader requests them to respond.
The reader is able to find tags with specific serial numbers by asking all tags with a serial number that starts with either 1 or 0 to respond.
If more than one responds, the reader might ask for all tags with a serial number that starts with 01 to respond, and then 010.
This is called "walking" a binary tree, or "tree walking".
See Singulation for additional relevant information.
I read your e-mail on the deplorable state of education in the United States.
Having taught both high school and college, I must admit that the comments are quite accurate. I must say that I am certainly doing my best to maintain high standards both at the university and high school levels and your newsletters have been a great help in helping me achieve this.
Best regards,James
John,
I enjoyed your latest newsletter about the problem of cheating and the watering down of the curricula in most academic areas. In my first teaching position almost forty years ago, I took a boy's History Regents paper away from him . . . along with his copious "cheat notes" and went to the Principal.
The result? I almost lost my job for daring to ruin this young person's life. The same Principal later asked me to remark the State Regents exams and see if I couldn't upgrade some of them because "they weren't going to be reviewed at the state capital that year and who would know the difference."
I'm happy to report I didn't, but it wasn't easy and the pressure on teachers to bend the rules has only grown worse. I don't know what the answers are, but you are right to highlight the problem.
Best wishes,
Ray
Hi John:
You have made some excellent points about education and Americans. I see this all the time. I have a Montessori Pre-school and we have "before and after-school kids" from three districts and it's amazing what they don't know and yet bring home "A's" and "B's".
Have you ever read the Leipzig Connection? I ran across it in a thrift store and it's the story of how America's education came to be what it is now.
Thanks for the wonderful newsletter. I don't say much about it but I do love getting it. You do a great job.
Pam