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VISUAL BASIC MSCOMM ONCOMM EVENT SUMMARY COMMEVENT CODE DESCRIPTION
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comEvSend comEvReceive comEvCTS comEvDSR comEvCD comEvRing comEvEOF comEventBreak comEventFrame comEventOverrun comEventRxOver comEventRxParity comEventTxFull comEventDCB
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1 2 3 4 5 6 7 1001 1004 1006 1008 1009 1010 1011
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Speci ed number of character sent Speci ed number of characters received Change in the CTS line Change in the DSR line Change in the carrier detect line Ring detect is active End of le character received Break signal received Framing error in incoming data Receive port overrun Receive buffer over ow Parity error in received data Transmit buffer is full Unexpected device control block error
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For basic OnComm events, to allow the OnComm handler to respond to the problems, the OnComm handler code simply has to be written. If the handler is not present and the error or event takes place, then it simply will be ignored by Visual Basic.
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Parallel Port
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Several years before the IBM PC rst became available, Centronics built and sold printers using a simple parallel bus interface. This bus was used to pass data from a computer to a printer and poll the printer status, waiting until additional characters could be sent. As part of the format, a special connector also was used. This connector format became very popular and was adopted by a number of printer manufacturers and quickly became an industry standard. The Centronics printer port s advantages were that its hardware could be replicated by using a few simple components, it was relatively fast compared with RS-232 ports, and software could be written easily for it. Today, the parallel port is the rst device most people look to
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PRACTICAL PC INTERFACING
when simple input-output (I/O) expansion must be implemented in the PC. I consider this unfortunate because this port is actually poorly designed for the purpose, and if you are looking for ef cient digital input/digital output in the PC, I suggest that a USB DI/DO card should be considered rst. The parallel port itself is very simple; the design used in the PC/AT consists of just seven TTL chips and provides a simple, byte-wide parallel bidirectional interface into the PC. Over the last 20 years, as PCs have gotten more complex, so have their printers. When the PC was rst introduced, the standard printer was a relabeled Epson (with an IBM Badge) dot-matrix Centronics-compatible graphics printer that used the parallel port s data and handshaking lines to control the data transfer a byte at a time from the PC. The early printer interfaces in the PC, after sending a byte, would wait for a handshaking line to indicate that the printer was ready for the next character before sending the next one. As you could imagine, this method was very slow and took up all the PC s cycles in printing a le. As printers have improved, data buffers have been built into them to allow faster data transfers, as well as byte-wide checking of data information. Specialized devices, such as scanners, have been added to the PC s parallel port because of the reasonably high bandwidth that can be obtained using this port. This method of passing data to a printer printing works reasonably well but can be inef cient for large volumes of data, and it can be dif cult to create drivers that work under Windows to share the printer port with another device. To model the parallel port, I usually go right to the base circuit shown in Fig. 19.3. This diagram shows the parallel port connector pin out along with the registers involved with passing data and the appropriate bits for the different functions. The control
Data Bus O/C Data Latch
(Base+0) _OE
Data Pins 2 9 _Strb 1 _SlctI 17 Init 16 -Auto FDXT 14 -Ack 10 _Error 15 _SlctO 13 Busy 11 PE 12 Gnd 18 25
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