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Not every computer-type device can receive serial data and process it as fast as it might arrive. Some devices, like the STAMP, must devote all of their attention to the serial line in order to receive data. Often handshaking bits are used to control the flow of data. The STAMP 2 uses 5-V logic. It outputs 0 V for a 0 and 5 V for a 1. When it accepts inputs from other circuits, it regards a voltage less than 1.5 V as a 0 and voltages greater than 1.5 V as a 1. In the RS-232 specification, a 0 is represented as a higher voltage, i.e., 10 V and a 1 by a negative voltage, typically 10 V To convert a 5-V logic level from , . the STAMP 2 s outputs and back generally requires RS-232 line drivers and line receivers. An RS-232 transmission is supposed to output 5 to 15 V for a 0. An RS-232 receiver is required to recognize 3 to 15 V as a 0. The 2-V difference between send and receive is accounted for by voltage drop over long wire. Note that a 5-V logic 1 is equivalent to an RS-232 logic 0. For a logic 1, an RS-232 transmission is supposed to output 5 to 15 V There is no way to get 3 V from the STAMP 2 5-V logic without additional .
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components, but most RS-232 devices also regard a signal close to 0 V as a logic 1. So if our 5-V logic s 0 is close to 0 V it will suffice as an RS-232 logic 1. , The STAMP 2 will support this type of fooling ; you simply program the STAMP 2 s serial output instruction to send inverted serial data. So now when the STAMP 2 receives data from conventional RS-232 sources, it is receiving a 15-V signal. In order to protect the STAMP 2 from destruction, a 22-k resistor is placed in series with the STAMP 2 I/O line for incoming RS-232 data. Many projects presented in this book use the alternative STAMP 2, which utilizes MAX232 serial line drivers to get serial data to and from the STAMP 2. The baudmode command is a 16-bit number that specifies all the important characteristics of the serial transmission, i.e., bit time, data and parity bits, polarity, etc. Table 2-1 illustrates more detail on decimal baud rate number information and direct versus line driver interfacing. Also check App. 2 and the STAMP 2 programming manual included on the enclosed CD-ROM. The Serin and Serout STAMP 2 serial command lines are typically quite similar in their appearance. The Serin command to send/receive asynchronous data is represented as Serin rpin{\fpin},baudmode,{plabel,}{timeout,label,}[inputData], and often the command can be as simple as Serin rpin,baudmode,[inputData]. The Serout command structure for transmitting asynchronous data is represented as Serout tpin,baudmode,{pace,}[outputData] or Serout tpin\fpin,baudmode,{timeout,tlabel,}[outputData]. Often the Serout command can be as simple as Serout tpin,baudmode,[outputData]. Some typical STAMP 2 SERIN commands are shown below.
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Serin rpin,baudmode, [inputdata]
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In the above example the rpin is the STAMP 2 I/O pin that will be receiving serial data. Baudmode is the setting for the bit rate, data bits, parity, and polarity. The inputdata specifies what do to with the incoming data to compare it, ignore it, store it, or convert it from text to a numeric value, for example.
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TABLE 2-1 SINGLE FRAME OF SERIAL DATA BAUDMODE (Decimal Numbers) 8 BITS NO PARITY 7 BITS EVEN PARITY 8 BITS NO PARITY 7 BITS EVEN PARITY
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