vb.net barcode scan event D.4 Virtual Parallel Port I/O Protocol in Software

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D.4 Virtual Parallel Port I/O Protocol
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This protocol is included as a convenience for extending the single byte parallel port to 4 input bytes and 4 output bytes. The protocol assumes there is multiplexing hardware connected to the parallel port. You can write your own protocol using the InPort and OutPort commands, but this protocol is provided for convenience and speed. This protocol makes use of the control port on the parallel port to put the port number on the multiplexer hardware (3 bits) and uses the fourth bit to clock the multiplexer and read the data or output the data depending on what port number is in use. The result is that one parallel port with only 8 I/O pins can be expanded to 4 8 Input and 4 8 Output pins. The hardware will not be discussed here (see Chap. 17 for a suggested design). On the parallel port connector, pins 2 to 9 are the data pins. Pins 1, 14, and 16 are used to set the address on the multiplexer. Where LSB (least signi cant bit) is pin 1. Pin 17 will be used to clock the multiplexer (low is HiZ, high is Clocked) assuming a rising edge trigger. Addresses 0 to 3 will be input ports (to the PC) and 4 to 7 will be output ports (from the PC). VPPortOut ExprN1,ExprN2 Outputs the byte value ExprN2 to the virtual parallel port number ExprN1. If ExprN2 is greater than 255 only the lower byte will be outputted. ExprN1 is limited to 1 to 4. If it is outside these limits the nearest limit will be set. VPPortIn ExprN1,VarN Reads the byte value at the virtual parallel port number ExprN1 and then puts it in the variable VarN. ExprN1 is limited to 1 to 4. If it is outside these limits the nearest limit will be set.
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PORTS AND SERIAL INPUT/OUTPUT
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WARNING! Use these commands with care. Badly designed hardware connected to the parallel port can damage the port. If you are going to experiment with electronics and these commands do so at your own risk and know what you are doing. Failure to do the correct design will damage your port if not your whole computer.
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D.5 General Ports I/O Commands
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OutPort ExprN1,ExprN2 Outputs the byte value ExprN2 to the PC port number ExprN1. If ExprN2 is greater than 255 only the lower byte will be outputted. ExprN1 can be any valid port number.
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WARNING! Using this command incorrectly can damage your system if you write or read from an incorrect port number.
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InPort ExprN1,VarN Reads the byte value at the PC port number ExprN1 and then put it in the variable VarN as a number. ExprN1 can be any valid port number.
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WARNING! Using this command incorrectly can damage your system if you write or read from an incorrect port number.
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D.6 Robot Simulator Serial I/O Protocol
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This protocol uses serial communication (can be Bluetooth virtual serial port) to communicate between RobotBASIC and a real robot with the ability to send and receive serial data. You can create your own protocol using the above serial communications commands. This protocol is provided for convenience. You can write programs normally using the simulator commands and functions. However if you signal RobotBASIC to use the serial port protocol the same program will run, but instead of simulating the robot on the screen it will send and receive data back and forth between a real robot and RobotBASIC. This allows you to test your simulated algorithms on a real physical robot. The microcontroller on the real robot receives data representing the commands (like rForward, etc.), responds to the commands and returns data to RobotBASIC to tell it that it received the command and acted upon it and that the current state of sensors is as per the data sent. You can write programs using the commands and function in the robot simulator, but the commands will not cause the simulated screen robot to move. Rather, a set of 2 bytes is sent via the serial port and then RobotBASIC will wait for a set of 5 bytes to be sent back. These 5 bytes are then stored and interpreted to provide data to be returned by the command or function.
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