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| Thread ID: 105963 | 2009-12-20 09:21:00 | Advice from people that remember using parallel ports to send stuff | nedkelly (9059) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 841464 | 2009-12-20 09:21:00 | Hi my uncle has 2 computer numerical controlled lathes to make valves and components. Both have a Parallel Com 1 port. He wants to run a cable between both com 1 ports and make it so on one machine he sets it to receive the program file to make the component and the other to send it. Does the cable have to have its pin outs changed at all to make one end sending and the other receiving? |
nedkelly (9059) | ||
| 841465 | 2009-12-20 18:57:00 | Are you really meaning parallel? "COM 1" normally refers to serial ports, although with a CNC lathe that assumption may well go out the window. If they are truly parallel, then are they standard PC-type parallel ports? If so, take a look at nullmodem.com - you're probably looking at either the null modem pinout for serial or the "LapLink cable" for parallel if your hardware uses PC-compatible ports. | MushHead (10626) | ||
| 841466 | 2009-12-20 19:15:00 | You are probably looking at an RS232 interface rather than parallel. www.arcelect.com HTH |
Sweep (90) | ||
| 841467 | 2009-12-20 23:05:00 | The ports are parallel but are labelled COM 1. Yes the standard parallel ports on every desktop. | nedkelly (9059) | ||
| 841468 | 2009-12-20 23:16:00 | Serial ports come in several forms. Connectors While the RS-232 standard originally specified a 25-pin D-type connector, many designers of personal computers chose to implement only a subset of the full standard: they traded off compatibility with the standard against the use of less costly and more compact connectors (in particular the DE-9 version used by the original IBM PC-AT). Starting around the time of the introduction of the IBM PC-AT, serial ports were commonly built with a 9-pin connector to save cost and space. However, presence of a 9-pin D-subminiature connector is neither necessary nor sufficient to indicate use of a serial port, since this connector was also used for video, joysticks, and other purposes. Some miniaturized electronics, particularly graphing calculators and hand-held amateur and two-way radio equipment, have serial ports using a jack plug connector, usually the smaller 2.5 or 3.5 mm connectors and use the most basic 3-wire interface. Many models of Macintosh favored the related (but faster) RS-422 standard, mostly using German Mini-DIN connectors, except in the earliest models. The Macintosh included a standard set of two ports for connection to a printer and a modem, but some PowerBook laptops had only one combined port to save space. Which is from this Wikipedia page. en.wikipedia.org |
KarameaDave (15222) | ||
| 841469 | 2009-12-20 23:18:00 | So we are talking about one of these? 25 pins. en.wikipedia.org Or are we talking about a serial port 15 or 9 pins which are Com ports? |
Sweep (90) | ||
| 841470 | 2009-12-20 23:21:00 | The ports are parallel but are labelled COM 1. Yes the standard parallel ports on every desktop. OK. So if these CNC controllers are just glorified PC's, then there should be a way to run something like the old LapLink to transfer data between them over their parallel ports. If this a built-in function of the CNC software though, then they might be relying on a particular cable configuration specific to the manufacturer. Do the machines run a "normal" OS - say DOS, or Windows? |
MushHead (10626) | ||
| 841471 | 2009-12-20 23:27:00 | KarameaDave + Sweep: It is a DB-25 MushHead: They are running customised Windows NT. Only one has a floppy drive or else we would just use that. Also before anyone suggests taking hard drives out, its not going to happen. They have too many cables going in to the pc box which is also part of the CNC machines. |
nedkelly (9059) | ||
| 841472 | 2009-12-21 00:12:00 | Right, so if it is a DB-25 it could be either serial or parallel, IMHO it is more likely to be serial. from the same page! Hardware abstraction Operating systems usually use a symbolic name to refer to the serial ports of a computer. Unix-like operating systems usually label the serial port devices /dev/tty* (tty an abbreviation for teletype) where * represents a string identifying the terminal device; the syntax of that string depends on the operating system and the device. The Microsoft MS-DOS and Windows environments refer to serial ports as COM ports: COM1, COM2, etc. On Linux, 8250/16550 UART hardware serial ports are named /dev/ttyS*, USB adapters appear as /dev/ttyUSB* and various types of virtual serial ports do not necessarily have names starting with tty. |
KarameaDave (15222) | ||
| 841473 | 2009-12-21 00:25:00 | So do I need to change any pin outs? | nedkelly (9059) | ||
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