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The alarm loop sensor module can be used to connect any number of alarm sensors to the input of the Tele-Alert system. Using the alarm sensor module, you can easily turn your Tele-Alert or Page-Alert into a portable burglar alarm system that can call you and let you know someone has violated a particular space that you have protected. The diagram in Fig. 22-4 depicts a clever method of utilizing both normally open and normally closed input sensors or alarm switches in a simple circuit. Normally open sensors or switch contacts are shown at S1, S2, and S3. Normally closed switches or alarm sensors are shown at S4, S5, S6, and S7. Any number of normally closed or normally open switches can be used in this input circuit. Not only can you use alarm switches such as window or door switches, but actual sensors can be substituted for switches floor mats or driveway sensors, infrared heat detectors, etc. Two 1N914 diodes, an npn transistor, and a few resistors form the heart of this detector. The alarm loop sensor module is powered from a 5-V source and can obtain power directly from either the Tele-Alert or Page-Alert boards. You could elect to build one of these input circuits for each of the Tele-Alert or Page-Alert input pins if desired; this would permit very large alarm systems with many zones. The output of the alarm loop sensor module provides a 5-V signal to the input of the STAMP 2 on receiving an alarm signal. A few of these detectors circuits could be built on a single circuit board to create a multichannel alarm system using your Tele-Alert system.

2:

Codd's article triggered a flurry of relational database research, including a major research project within IBM. The goal of the project, called System/R, was to prove the workability of the relational concept and to provide some experience in actually implementing a relational DBMS. Work on System/R began in the mid-1970s at IBM's Santa Teresa laboratories in San Jose, California. In 1974 and 1975 the first phase of the System/R project produced a minimal prototype of a relational DBMS. In addition to the DBMS itself, the System/R project included work on database query languages. One of these languages was called SEQUEL, an acronym for Structured English Query Language. In 1976 and 1977 the System/R research prototype was rewritten from scratch. The new implementation supported multi-table queries and allowed several users to share access to the data. The System/R implementation was distributed to a number of IBM customer sites for evaluation in 1978 and 1979. These early customer sites provided some actual user experience with System/R and its database language, which, for legal reasons, had been renamed SQL, or Structured Query Language. Despite the name change, the SEQUEL pronunciation remained and continues to this day. In 1979 the System/R research project came to an end, with IBM concluding that relational databases were not only feasible, but could be the basis for a useful commercial product.

Query Analyzer is designed as an MDI application that can contain one or more Query windows. Users can use Query windows to enter and execute a batch of Transact-SQL statements. A Query window contains two major components: the Query pane and the Results pane (see Figure 2-1). The Query pane is a Transact-SQL syntax-sensitive editor. Because it is syntax-sensitive, users can type Transact-SQL statements in the pane and Query Analyzer will color different code components such as keywords, variables, and literals using different colors. The Results pane displays the result of the code executed in the Query pane. Earlier versions of SQL Server displayed results only

The temperature/voltage level module board kit is a versatile addition to the Tele-Alert or Page-Alert microprocessor alarm controller, and is shown in Fig. 22-5. The temperature/voltage level module is a single-channel module that will permit you to monitor temperature level changes, either upward or downward, or it can allow you to measure voltage level changes by setting a user threshold control. The temperature/voltage level (TVL) board consists of a single LM393 comparator integrated circuit and a handful of components (Fig. 22-6). The circuit begins with S1 (a resistive sensor, or thermistor) and R6. S1 and R6 form a voltage divider to ground. In this configuration, you are able to monitor upward temperature changes. If the positions of S1 and R6 are reversed, then you are able to monitor decreasing temperature changes. The thermistor output at pin 3 of U1 represents the plus ( ) input to the comparator circuits. The resistor network at R12 acts as the threshold control on the minus ( ) inputs of the comparator. The output of the comparator at pin 1 and pin 4 produces a (high) output when the threshold is sensed. The TVL module can also be used to monitor voltage level changes by eliminating thermistor S1 and resistor R6 and replacing them with scaling resistors instead. Scaling resistors will now represent voltage dividers consisting of two resistors at each input channel. Ratios such as 100 k to 1 k for R1/R2 or 1 k to 100 for R3/R4 would be used as

Figure 2-1.