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You can easily create a 56-channel radio remote control system by implementing the NCD101 serial-to-parallel converter. The unique 56-channel radio remote control is ideal for model train or robot enthusiasts. The radio remote control system begins with a PS/2 keyboard encoder at U2, which serially drives an Abacom AM-RT5 data transmitter, as shown in Fig. 3-15. The keyboard controller and RF transmitter are both powered from a 5-V regulator at U1. The receiver and controls section of the 56-channel remote control system are shown in Fig. 3-16. An Abacom HRR-3 superregenerative receiver is coupled to two sections of a MAX232 serial interface chip. The output of the MAX232 is next fed to seven NCD-101 serial-to-parallel converters to form a 56-channel radio remote control system. Each of the NCD-101 outputs would then be fed to a transistor relay driver for control applications. The 56-channel radio remote control receiver can be powered from a 5-Vdc power supply. In order to activate a particular channel of NCD-101 converter, you just need to send NAME N PIN NUMBER RETURN . For example, if have a single NCD-101, and you wanted to activate output D03, you would press 0N3 on your keyboard. This sequence would tell NCD 101 named 0 to turn on pin 3. Recall that each NCD 101 has an address. An NCD-101 named 0 would be programmed for each address as 0,0,0 on the programming pins. Now, if you wanted to turn off pin 3 of NCD named 0, you would send 0F3. For more details on the NCD-101, check App. 1.

If you attempt to run this stored procedure, SQL Server will return the following:

When you specify a column name in a SQL statement, SQL can normally determine from the context which column you intend. However, if the statement involves two columns with the same name from two different tables, you must use a qualified column name to unambiguously identify the column you intend. A qualified column name specifies both the name of the table containing the column and the name of the column, separated by a period (.). For example, the column named SALES in the SALESREPS table has the qualified column name: SALESREPS.SALES If the column comes from a table owned by another user, a qualified table name is used in the qualified column name. For example, the BIRTHDATE column in the BIRTHDAYS table owned by the user SAM is specified by the fully qualified column name: SAM.BIRTHDAYS.BIRTH_DATE Qualified column names can generally be used in a SQL statement wherever a simple (unqualified) column name can appear; exceptions are noted in the descriptions of the individual SQL statements.

----Start Server: Msg 208, Level 16, State 1, Procedure prDeferredNameResolution, Line 7 Invalid object name 'NonExistingTable'.

TABLE 3-5 NCD-106 ADDRESSABLE A/D DIGITAL INPUT/OUTPUT CONTROL DEVICE NAME/ADDRESS PROGRAMMING NAME/ADDRESS PROGRAMMING NAME N2 N1

The execution will be stopped. Even an error handler written in Transact-SQL will not be able to proceed at this point.

The ANSI/ISO SQL standard specifies the various types of data that can be stored in a SQL-based database and manipulated by the SQL language The original SQL1 standard specified only a minimal set of data types The SQL2 standard expanded this list to include variable-length character strings, date and time data, bit strings, and other types Today's commercial DBMS products can process a rich variety of different kinds of data, and there is considerable diversity in the particular data types supported across different DBMS brands Typical data types include: Integers Columns holding this type of data typically store counts, quantities, ages, and so on Integer columns are also frequently used to contain ID numbers, such as customer, employee, and order numbers Decimal numbers Columns with this data type store numbers that have fractional parts and must be calculated exactly, such as rates and percentages.

Be very cautious when you use cursors. Test the status after each fetch; place error handling after each command; do not forget to close and deallocate the cursor when you do not need it any more. There are many rules and regulations for using cursors, and some of them might seem trivial, but even the smallest mistake can halt the execution of your code.

The overconfidence that comes with routine may be your worst enemy. If you perform the same or similar tasks over and over again, you can lose focus and skip basic steps. Do not put code into production before it is thoroughly tested; do not place bug fixes