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PORTS AND SERIAL INPUT/OUTPUT
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string returned will be null. Use the CheckSerBuffer command to determine how many bytes (if any) of data are waiting on the buffer. SerBytesIn ExprN,VarS,VarN This command reads ExprN bytes from the serial input buffer and puts them in to the string variable VarS. VarN is set to the number of bytes actually read before a time out occurred. The command will wait until ExprN bytes are read. If a time-out occurs before all the characters are retrieved then what ever characters have been read are returned inside VarS and VarN is set to the number actually read. See SetTimeOut and GetTimeOut commands. The maximum amount for ExprN is 4095 bytes and the minimum is 1. ExprN will be set to the closest limit if it is outside the range 1 to 4095. SetTimeOut {ExprN} This command sets the time-out for the serial port reading commands. ExprN is the number of milliseconds to wait before a time out occurs. ExprN is optional and if not given or is less than one then 5000 is assumed (i.e., 5 seconds). 5000 is also the default on program startup. GetTimeOut VarN This command reads the current setting for the time-out for the serial port and puts the value in VarN. The number returned is in milliseconds. CheckSerBuffer VarN This command assigns the number of characters in the serial input buffer to the variable VarN. The buffer can be read with the commands above. ClearSerBuffer {ExprN} This command clears the input and output serial buffers. If ExprN is not given or is 0 then both buffers are cleared. A value of 1 will clear the input buffer. A value of 2 will clear the output buffer. Any other values are ignored.
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D.3 Parallel Ports I/O Commands
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These commands read and write byte values to the parallel port speci ed. These commands assume that your system has a bidirectional parallel port (ECP standard). If your system does not have this then only output is possible and no input can occur. You can check if your system has this capability and set it using the BIOS setup while starting your PC. If you have more than one parallel port you can specify which one to use by specifying its base address using the SetPPortNumber command. PPortOut ExprN1 Outputs the byte value ExprN1 to the parallel port If ExprN1 is greater than 255 only the lower byte will be outputted. PPortIn VarN Reads the data byte at the parallel port.
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SetPPortNumber {ExprN} This command sets the base address of the parallel port to be used by all the parallel port commands including the virtual ones below. The system defaults to address 888 (hex 0x378), which is usually the rst and only parallel port on
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APPENDICES
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many systems. If your system has more than one port and you wish to use other than the default rst port use this command to specify the port number (in decimal). You can nd the addresses of available ports from the BIOS setup upon starting your computer, or you can use the Windows system to do the same. Beware the reported addresses are usually given in hexadecimal format. You need to convert them to integer to use it for ExprN in this command [see function HextToInt()]. ExprN is optional and if it is not given or it is less than one then the system will use port number 888 (hex 0x378).
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WARNING! If you specify the wrong address the commands will not function and you may even damage your system.
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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 use the correct design will damage your port if not your whole computer.
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