![]() Server computers may use a serial port as a control console for diagnostics, while networking hardware (such as routers and switches) commonly use serial console ports for configuration, diagnostics, and emergency maintenance access. However, serial ports are still frequently used in applications demanding simple, low-speed interfaces, such as industrial automation systems, scientific instruments, point of sale systems and some industrial and consumer products. ![]() Modern consumer personal computers (PCs) have largely replaced serial ports with higher-speed standards, primarily USB. While interfaces such as Ethernet, FireWire, and USB also send data as a serial stream, the term serial port usually denotes hardware compliant with RS-232 or a related standard, such as RS-485 or RS-422. Throughout most of the history of personal computers, data has been transferred through serial ports to devices such as modems, terminals, various peripherals, and directly between computers. This is in contrast to a parallel port, which communicates multiple bits simultaneously in parallel. On computers, a serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time. ² These signals should be provided by the device if converters from RS485 to fibre optic transmission are to be supported.Communication interface transmitting information sequentiallyĪ male D-subminiature connector used for a serial port on an IBM PC compatible computer along with the serial port symbol Repeater Steuersignal (Senderichtungssteuerung) Table: pin assignment of 9-pin Sub-D-connector Please scroll with your mouse over the display! Pin assignment of 9-pin Sub-D-connector front sidet Use only Sub-D-connectors that ensures a good conducting of the shield with the connector by some grooves. This applies particularly to the use of insulation displacement technology.Īt least one of the PROFIBUS connectors should have a socket for a programming or diagnostic device (piggy-back socket) which is best located at the beginning or the end of the cable (segment). You should always refer to the specific manufacturer’s instructionss.Įnsure that you are only using PROFIBUS cables approved by the connector manufacturer for use with the respective connector. However, they do not provide full assembly instructions. The following sections provide examples of a few implemented solutions from different manufacturers. This also offers the benefit that the PROFIBUS cable can be easily reconnected in case of repair or maintenance.įor field assembled PROFIBUS cables the following technologies are used: For this reason, you should always select a method that can be field-assembled for on-site installation. The wiring techniques for pre-assembled PROFIBUS cables require special tools. ![]() Wiring techniques differ from manufacturer to manufacturer these can be divided into two groups: preassembled PROFIBUS cables and field-assembled PROFIBUS cables. The PROFIBUS guideline Interconnection Technology specifies the following assignment: The color scheme must be used consistently within a segment i.e. These two terminals connect to the two data wires in the PROFIBUS cable. ![]() Each set of terminals is normally labeled “A” and “B” or given a color reference, e.g. For this reason, PROFIBUS connectors normally have two cable entries, each with a set of terminals. This allows PROFIBUS station connection without using T-junctions (which introduce spur lines). The PROFIBUS cables are normally daisy-chained through the connector. Unless using pre-made cable assemblies, the connector must be fitted to the PROFIBUS cable. The 9-pin Sub-D connector is suitable for use inside control cabinets (IP 20). WBT PROFIBUS Installation Guide - 2 Assembling PROFIBUS cables
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