Rs232 Pin Assignment

In fact, it's overkill for most standard communication.However, it's good enough to have become an industry standard.These connectors provide the same necessary pins as a DB-25, but are smaller, more manageable connectors.

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In this case, serial cables simply leave the unused pins disconnected.

There are two cable configurations in use today for serial equipment: These different configurations determine which signal a device expects on which pin. Because terminals are typically DTE, and modems are typically DCE, you must use a different cable between a computer and a terminal than between a computer and a modem.

DIN-8 serial connectors are small, and almost circular.

They are used on Macs, and often on laptops because they are so compact.

RJ-45 connectors look a lot like standard telephone connectors ... They house eight wires instead of the four wires in a telephone connector.

Dissertations & Theses From Start To Finish - Rs232 Pin Assignment

RJ-45s are not typically found on computers or normal serial equipment, but, because they are so small, they are often used on devices that have a lot of ports very close together.However, since male connectors are more susceptible to injury than female, most expensive computing hardware these days has female connectors, while cables are male on both ends.Since RS-232 defines signals that are not used for most standard communication, sometimes DB-25 connectors are missing unneeded pins.When you are connected via a modem, if the carrier signal is lost, you want the modem to hang up.If you are using soft carrier, DCD is assumed to be asserted, so even if you lose the signal, the modem can remain connected.This is a pretty conservative figure and has been stretched as far as 1,000 feet.How far the limit can be stretched depends on the brand of terminal and computer you are using.Most serial ports follow a standard called the RS-232 specification.RS-232 is a sort of "do all" specification, and as such is not perfect in every situation.For instance, with a terminal, it lets you use only 3 wires for a connection: transmitted data, received data, and signal ground.However, in a modem connection, you really want to pay attention to DCD.

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