vb.net barcode scan event PORTS AND SERIAL INPUT/OUTPUT in Software

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APPENDIX
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PORTS AND SERIAL INPUT/OUTPUT
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D.1 General Information
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The following commands allow for using direct port input/output (I/O) where you can read/write a byte from/to a particular port on the PC. There is a set of special commands for I/O to the parallel port as a special case for ease of use. There is also a set of commands that allow for serial I/O using either actual comm ports on the PC or virtual comm ports created by protocols such as Bluetooth devices or USB devices. These devices will create a virtual port number that can be used for all intents and purposes as if it were a physical serial comm port. The robot simulator has an extension that allows for the use of serial I/O to communicate to and from a real robot, effectively enabling programming of a real robot using the RobotBASIC language. The protocol extension will be explained in its own section below. To facilitate serial comm port setup there are a set of constants that are listed in the Constants help page within the IDE. The I/O commands are not case sensitive. Throughout this section there will be reference to the following items:
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ExprN implies that a numeric resulting expression is required. ExprS implies that a string resulting expression is required.
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APPENDICES
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Expr implies that any type expression is required. {Expr} or {Var} implies that it is optional and {Expr...} means many can be given. Var implies that a variable name must be provided. If VarS is speci ed then it will be lled with a string if VarN is speci ed then it will be lled with a number.
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If a Var is expected in any of the commands, then if Var exists it will be replaced with the result otherwise it will be created and assigned the result.
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NOTE:
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Always refer to the help pages within the RobotBASIC IDE for the most upto-date information regarding material mentioned in this appendix.
D.2 Serial I/O Commands
SetCommPort ExprN1 {,ExprN2 {,ExprN2 {,ExprN3 {,ExprN4 {,ExprN5}}}}} This command sets the comm port number and parameters and activates the port for communications.
ExprN1 is the port number 1 to 5000. ExprN2 is the baud rate 0 to 14 (see the Constants help page for details of codes). Defaults to 6, that is, 9600 baud. ExprN3 is the number of data bits in the transmitted byte can be 4, 5, 6, 7, or 8. Defaults to 8. ExprN4 is the parity check 0 to 4 (see Sec. B.7.6). Defaults to 0 (no parity). ExprN5 is the number of stop bits in the transmission (see the Constants help page). Ranges from 0 to 2. Defaults to 1, that is, 1 stop bit.
ExprN6 is the ow-control protocol (see the Constants help page). Ranges from 0 to 2. Defaults to 0, that is, none.
To deactivate the communication port issue the command SetCommPort 0
SerOut Expr {,Expr {; Expr ...}} This command is similar to the Print command. The output of the command is sent to the serial port in place of the Terminal Screen. Outputs the values of Expr.... to the serial port. A comma (,) between the expressions makes them print with no space between them. A semicolon (;) prints them with a tab space between them. You must specify at least one expression. The result of all the expressions is put together as speci ed by the commas and semicolons into one string and the string is outputted to the serial port as speci ed by the SetCommPort command. The total length of the resulting string will be truncated to 4095 bytes if it exceeds this size. SerIn VarS This command reads the data that is currently in the serial communications buffer all in one go and puts it as a string in the variable VarS. You can use string manipulation commands and functions as well as conversion functions to make use of the data. The command will not cause a time out. If there are no bytes in the input buffer the
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