9 pin serial plug

A modem or other device that receives this DTR signal may do various things. If a modem has been configured a certain way it will hang up the telephone line when DTR is negated. In other cases it may ignore this signal or do something else when DTR is negated turned off. It's like this for all the 6 signal lines. However, most pins have certain functions which they normally perform but this may vary with the operating system and the device driver configuration.

Under Linux, one may modify the source code to make these signal lines behave differently some people have. A cable from a serial port always connects to another serial port. An external modem or other device that connects to the serial port has a serial port built into it. For modems, the cable is always straight thru: pin 2 goes to pin 2, etc. There are good reasons why it works this way. One reason is that the signals are unidirectional.

If pin 2 sends a signal out of it but is unable to receive any signal then obviously you can't connect it to pin 2 of the same type of device. If you did, they would both send out signals on the same wire to each other but neither would be able to receive any signal.

There are two ways to deal with this situation. One way is to have a two different types of equipment where pin 2 of the first type sends the signal to pin 2 of the second type which receives the signal. There's a second way to do this without having two different types of equipment: Connect pin sending pin 2 to a receiving pin 3 on same type of equipment. A serial adapter, also referred to as a serial converter is a small electronic device which can convert one type of data signal into a different type of data signal.

The difference between an adapter and a converter generally is that an adapter usually only adapts the physical interface of a device to match a different type of physical interface of a different device whereas a converter converts the actual data stream between two devices.

Therefore we will use the term "converter" in the following. Even the RS standard is an older communication protocol it is still used by many modern devices in both business and consumer markets and is also often used for personal and office devices. Actually many new devices designed today are designed with a RS serial port, often because RS is a very robust and reliable protocol which is fairly easy for program writes to integrate into their system. Serial converters are used a lot in industrial applications as a way to communicate with factory machinery or to interface with test equipment, however in one particular area the serial converter has also become very useful for consumers who need a serial port in their personal computer.

Most new computers today does not have a RS COM port which makes the use of a USB to serial converter useful for connecting equipment such as serial printers, scanners, scales and GPS devices, but also many types of business, office and laboratory equipment.

Wireless Serial Solutions. Serial to Ethernet Converters. Serial Port Cards. Serial Accessories. Ring Indicator — The ring indicator RI signal will be activated if a modem that operates as a data set detects low frequency. When this occurs, the data terminal is alerted, but the RI will not stop the flow of serial data between devices.

Understanding the ins and outs of the 9 pin RS cable pinout can be challenging for even experienced design services professionals. But with support from a proven engineering team, you can optimize the transmission of data via a RS 9 pin pinout. Stratus Engineering supplies a broad array of RS hardware monitoring solutions , along with application expertise and extensive hardware and software engineering experience.

To learn more how we support electronics and software for embedded systems, please contact us today at Call us! An RS pinout 9 pin cable features nine pins: 1.