Serial ProgrammingRS 4. Wikibooks, open books for an open world. All bookshelves Science bookshelf Computer Science bookshelf Serial communications bookshelf RS 4. Technical Manual. IntroductioneditANSITIAEIA 4. RS 4. 85, is a standard defining the physical layer of a two wire multipoint communications network. This standard is one of the more misunderstood of EIAs standards. Many engineers have worked on an RS 4. Yet few of these engineers have ever seen the standard, let alone read it. The RS 2. 32, RS 4. RS 4. 85 standards are not comprehensive communications protocols, but are electrical layer standards that are intended to be used in conjunction with other standards. These other standards provide the protocol and other requirements that are needed for two devices to transfer information. IndianJRadiolImaging_2010_20_4_240_73527_b3.jpg' alt='Serial Ports Vs Parallel Ports For Computers' title='Serial Ports Vs Parallel Ports For Computers' />Just because a protocol is used with a particular implementation of RS 2. RS 4. 85, does not mean it is part of the standard. A direct quote from the RS 4. This Standard does not specify other characteristics, such as signal quality, timing, protocol, pin assignments, power supply voltage, operating temperature range, etc., that are essential for proper operation of interconnected equipment. The RS 4. RS 4. 85 standard includes the asynchronous start stop communication bit protocol the UART bit protocol commonly used with a RS 2. This free tutorial explains the various ports on a computer such as audio, video, USB, Firewire, etc. Simple circuits and examples to describe how to use PC parallel port as general purpose output port. Introduction. ANSITIAEIA485, commonly called RS485, is a standard defining the physical layer of a two wire multipoint communications network. This appendix will attempt to explain what RS 2. RS 4. 22, and RS 4. Serial ATA SATA, abbreviated from Serial AT Attachment is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives. Serial ATA Serial Advanced Technology Attachment or SATA is a standard for connecting and transferring data from hard disk drives to computer systems. In computing, Serial Attached SCSI SAS is a pointtopoint serial protocol that moves data to and from computerstorage devices such as hard drives and tape drives. RS 4. 22 and RS 4. ASCII communication with a UART. HistoryeditThe EIA once labeled all its standards with the prefix RS Recommended Standard, but the EIA TIA officially replaced RS with EIATIA to help identify the origin of its standards1 starting in 1. The EIA has officially disbanded and these standards are now maintained by the TIA. The RS 4. 85 standard is obsolete and has been superseded by TIA 4. RS designation even though it has officially changed. Because the EIA was accredited by ANSI to help develop standards in its areas, these standards may be described as an ANSI standard e. ANSITIAEIA 4. 85. Title Electrical Characteristics of Generators and Receivers for Use in Balanced Multipoint SystemsNote The following information is is believed to be correct but verification is neededDeveloper Electronics Industries Association EIA. Association of Industrial Electronics. RS 4. 85. A Recommended Standard 4. Edition A 1. 98. EIA 4. A 1. 98. TIAEIA 4. A 1. Approved March 3, 1. TIAEIA 4. 85 A 2. Reaffirmed March 2. International and national standards based on the standard RS 4. ISOIEC 8. 48. 2 Second edition 1. ISO 8. 28. 4 1. 98. ITU T v. 1. 1 1. ITU T v. CCITT v. 1. 1 1. The IHS Standards Store has relabeled all of the 2. TIA 2. 32. It is not clear as to what the actual standard name is for each release. E verifiedAccording to the IHS Standards Store 2 The RS 2. RS 2. 32 Revision 1. Edition. Published May 1, 1. Title Interconnection of Data Terminal Equipment with a Communications Channel. Pages 8. PURPOSE AND SCOPE OF COVERAGE This standard is intended to provide a method of interconnecting data terminal equipment and a data communication channel when each is furnished by different companies. It defines a means of exchanging control signals and binary serialized data signals between data terminal equipment and a data communication channel in cases where interchange point. RS 2. 32 Revision Revision APublished October 1, 1. Title Interface Between Data Processing Terminal Equipment and Data Communication Equipment. Pages 1. 2PURPOSE AND SCOPE OF COVERAGE This standard is applicable to the interconnection of data processing terminal equipment and data communication equipment. It defines a means of exchanging control signals and binary serialized data signals between data processing terminal equipment and data communication equipment, and is of particular importance when each is furnished by a different company. RS 2. 32 Revision Revision BPublished October 1, 1. Title Interface Between Data Processing Terminal Equipment and Data Communication Equipment. Pages 1. 2PURPOSE AND SCOPE OF COVERAGE This standard is applicable to the interconnection of data processing terminal equipment and data communication equipment. It defines a means of exchanging control signals and binary serialized data signals between data processing terminal equipment and data communication equipment, and is of particular importance when each is furnished by a different company. RS 2. 32 Revision Revision CPublished August 1, 1. Title Interface Between Data Terminal Equipment and Data Communication Equipment Employing Serial Binary Data Interchange. Pages 3. 4PURPOSE AND SCOPE OF COVERAGE This standard is applicable to the interconnection of data terminal equipment DTE and data communication equipment DCE employing serial binary data interchange. It defines 2. Revision Revision DPublished November 1. Title Interface Between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange. Pages 5. 3PURPOSE AND SCOPE OF COVERAGE This standard is applicable to the interconnection of data terminal equipment DTE and data circuit terminal equipment DCE employing serial binary data interchange. It defines ANSIEIATIA 2. E 1. 99. 1Revision Revision EPublished January 1, 1. Title Interface Between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange. Pages 4. 3PURPOSE AND SCOPE OF COVERAGE This standard is applicable to the interconnection of data terminal equipment DTE and data circuit terminating equipment DCE employing serial binary data interchange. It defines ANSIEIATIA 2. F Revision Revision FPublished October 1, 1. Title Interface Between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange. Pages 4. 7PURPOSE AND SCOPE OF COVERAGE Unavailable. ANSIEIATIA 2. 32 F Revision Revision FPublished October 1, 1. Title Interface Between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange Includes all amendments and changes through Reaffirmation Notice, October 1. Pages 5. 1PURPOSE AND SCOPE OF COVERAGE unavailable. TIA 2. 32 F Revision Revision FPublished October 1, 1. Title Interface Between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange Includes all amendments and changes through Reaffirmation Notice, December 7, 2. Pages 5. 4PURPOSE AND SCOPE OF COVERAGE unavailableStubDocument ConventionseditThis document is primarily directed at discussion of RS 4. RS 2. 32 and RS 4. Direct quotations from one of the standards are shown inside quotation marks in a fixed width fontAll three standards have annexes. These annexes clearly state that they are not a part of the standard, and are included for informational informative purposes only. These annexes are discussed in this document but it should be clear that they are not a part of the standard even though they are included in the standard. Many references and examples are made to asynchronous start stop communication with a UART or UART communications. This is the 7 or 8 bit protocol commonly associated with serial ports. Parallel port output. For Spanish version click here. Copyright Tomi Engdahl 1. Index. PC parallel port can be very useful IO channel for connecting your. PC. The PCs parallel port can be used to perform some very amusing hardware interfacing experiments. The port is very easy to use when you first understand some basic tricks. This document tries to show those tricks in easy to understand way. WARNING PC parallel port can be damaged quite easily if you make mistakes. If the parallel port is integrated to the. Safest bet is to buy an inexpensive IO card which. If you manage. to damage the parallel port on that card, replacing it is easy and inexpensive. NOTE The IO port level controlling details here has proven to work well with parallel ports on the PC motherboard and expansion cards connected to ISA bus. The programming examples might not work with PCI bus based IO cards they can use different hardware andor IO addresses, their drivers make they just look like parallel ports to normal applications. The programming examples do not work with USB to parallel port adapters they use entirely different hardware, their drivers make them to look like normal parallel port to operating system normal applications. Every reasonable care has been taken in producing this information. However, the author can accept no responsibility for any effect that this. It is the responsibly of the end user to determine fitness. The circuits and software shown here are for non commercial use without. PC parallel port is 2. D shaped female connector in the back of the. It is normally used for connecting computer to printer, but many. Not all 2. 5 are needed always. Usually you can easily do with only 8. I have presented those. Those output pins are adequate for many purposes. Pins 1. 8,1. 9,2. Those datapins are TTL level output pins. This means that they. V when they are in low logic level 0 and 5. V when they. are in high logic level 1. In real world the voltages can be something. The output current capacity of the parallel port is limited to only. Here is a simple idea how you can connect load to a PC parallel port data pins. Dn Out. Sourcing Load up to 2. A 2. 4 v. Ground. This is not the only way to connect things to a parallel port. The parallel port data pins are TTL outputs, that can both. In ordinary parallel port implementations the data outputs are 7. LS3. 74 IC totem pole TTL outputs which can source 2. A and sink 2. 4 m. A. Regular TTL outputs basically consist of a two stacked transistor in series. This is called a totem pole output. At any given time one of these. To pull the output high. H, which sources positive. To pull the output low, only the lower. L conducts, sinking current to ground an external device. H on V. TTL output on 1 high, sourcing current. L off V. Gnd. 5. H off. V. TTL output off 0 low, sinking current. Gnd. The outputs are designed so that they give at least 2. V at 2. 6 m. A load. This 2. 6 m. A figure is for ordinary LS TLL circuits used, the LSI implementations used in many computers can give more or less. For example quite popular few years ago UM8. C1. 1 C parallel port chip can only source 2 m. A. Simple current sinking load connection. Dn Out. Sourcing Load up to 2. A 2. 4 v. Ground. When taking current from PC parallel port, keep the load low, only up to few milliamperes. Trying to toke too much current for example shorting pins to ground can fry the parallel port. I have not killed any parallel port yet in this method, but I have had in cases where too much load has made the parallel port IC very hot. Be careful. If you have an external 5 volt supply, you have another option. Data Out pins to sink up to 2. A from your 5 volt supply. This can be made with a circuit like this. Sinking Load up to 2. A 4. 2v. Power Supply. Dn Out. Ground Gnd. The load gets power then you have external 5. V on and the printer. This circuit gives you capability of. You need to be careful with this circuit, because with this. My advice is to be very careful with this type. V power supply gets. V though the load to printer port when. The most convient source external 5. V might. be from same other port on your PC USB, joystick, keyboardmouse etc. I have used mostly sinking type circuits and this article. Simple LED driving circuits. You can make simple circuit for driving a small led through PC. The only components needed are one LED and one. You simply connect the diode and resistor. The resistors is needed to limit the current taken. LEDs and is still safe value not overloading the parallel port. In practical case the output current will be few. LED, which will cause a typical LED. Then you connect the circuit to the parallel port. LED and another one goes to any of the ground pins. Free Adobe After Effects 7 Templates For Microsoft there. Be sure to fit the circuit so that the LED positive lead the longer. If you put the led in the wrong way, it will. You can connect one circuit to each of the parallel port data pins. In this way you get eight software controllable LEDs. When you send out 1 to the datapin where the. LED is connected, that LED will light. When you send 0 to that same pin. LED will no longer light. Here are two photos of circuit above I have built. Pn those circuits I have wired the ground wire only to one ground pin it works also well, you can use any of the ground pins. Technical specifications of parallel port pins. The IBM specifications says accoding http www. IO Port Programming 6. The data output pins pins 2 9 sink 2. A, source 1. 5 m. A, and their high level output is min. V. The low state for both is max. V. Pins 1, 1. 4, 1. V through 4. 7 kiloohm resistors sink 2. A, source 0. 5. 5 m. A, high level output 5. V minus pullup. Non IBM parallel ports probably deviate from this standard. Warning Be careful with grounding. You can break parallel ports by connecting devices to them when PC is powered on. It is not a good idea to short the pins to ground or 5. V, this can damage the port. It might be a good thing to use a parallel port not integrated on the motherboard for things like this. You can usually get a second parallel port for your machine with a cheap standard multi IO card. The following program is an example how to control parallel port LPT1. This example directly controls the. It works nicely under. MSDOS. You can look the Borland Pascal 7. LPTOUT. EXE. This has worked nicely for me in DOS systems and Windows 9. On recent testings this program has worked unreliably on some Windoes 2. Program lpt. 1output. Mem. W0. 04. 0 0. ValParam. Str1,data,e. Portaddr data. How to use the program. LPTOUT. EXE is very easy to use program. The program takes one. That value must be integer in decimal format for example 2. Hexadecimal numbers can also be used, but they must be preceded by. FF. The program hoes not have any type of error. If your number is not in correct format. NOTE I have found out that this program does not work reliably on. Windows 2. 00. 0 systems I have tested on this. I dont know. what is causing this specific problem other than you should not. Windows NT based system. I have not tested this program with Windows XP. Example how to use the program. LPTOUT 0. Set all datapins to low level. LPTOUT 2. 55. Set all datapins to high level. LPTOUT 1. Set datapin D0 to high level and all other datapins to low level.