Serial Port Complete - Latest Microcontroller projects
Chapter 3 " !" A device interface GUID identifies devices that applications can access in the same way. Dur ...
COM Ports on PCs 3 For .NET’s programmers, the SerialPort class provides a convenient way to ...
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4 RS-232 is an interface that is suitable for many basic communication tasks between two computers. This chapter in ...
Chapter 4 International Telecommunication Union (ITU) and ISO 2110 from the Inter- national Organization for Standardization (IS ...
Inside RS-232 $ % These are the three essential lines for 2-way RS-232 communications: TX. Carries data from the D ...
Chapter 4 Software drivers for some USB virtual COM ports don’t allow applications to read CTS directly. An application that req ...
Inside RS-232 The status and control signals use the same voltages, but with positive logic. A positive voltage indicates a logi ...
Chapter 4 1 % The TIA-232 standard includes timing specifications that RS-232-compliant chips must meet. The specified ...
Inside RS-232 gle +3V or +3.3V supply with signal voltages referenced to ground. Microcon- trollers typically use positive logic ...
Chapter 4 $ #()*) The MAX232 (Figure 4-1) includes two drivers that convert TTL or CMOS inputs to RS-232 outputs and two rece ...
Inside RS-232 Figure 4-1: Chips like the MAX232 and MAX233A simplify interfacing 5V logic to RS-232. ...
Chapter 4 The MAX3212 has several advanced power-saving features. When all of the RS-232 inputs are less than +3V and greater th ...
Inside RS-232 Instead of requiring or generating their own negative voltage sources, Maxim/Dallas Semiconductor’s DS275 and DS27 ...
Chapter 4 off and R2 pulls RS-232 Out near 5V. When the TTL/CMOS output is high, Q1 switches on, and RS-232 Out is near 0V. At t ...
Inside RS-232 The RS-232 receiver is much like the previous circuit’s, but the driver’s circuit is different. When TTL Serial Ou ...
Chapter 4 The power comes from otherwise unused outputs. To comply with the stan- dard, an RS-232 driver’s output must be at lea ...
Inside RS-232 for power might be a solution if you’re using the port to control a synchronous interface and using flow-control l ...
Chapter 4 Because you can count on getting at most a few milliamperes from the port, use the lowest-power components you can fin ...
Inside RS-232 Table 4-4: In addition to RS-232, there are several other EIA/TIA interfaces for unbalanced lines. + ...
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