What is a serial crossover cable?
What is a serial crossover cable?
A null modem serial cable (frequently called a crossover cable) is used to connect two DTE devices together without the use of a DCE device in between. For this to happen, the Transmit (TXD) and Receive (RXD) pins on one of the serial connectors are flipped.
What cable is used for serial communication?
Serial cables are used for the serial transmission of data. They support communication standards such as RS232, RS422, and RS485, as well as Fibre Channel, IEEE 1394 or FireWire® (Apple Computer, Inc.), and universal serial bus (USB).
Are there different types of serial cables?
The RS-232 specification defines two types of serial devices, DTE and DCE. DTE normally refers to the serial port on a PC or terminal, while DCE refers to a modem or other type of communications device.
How far can a serial cable be run?
50 feet
Serial (RS-232) – The maximum cable length that we suggest is 50 feet. At lengths greater than 50 feet, there may be a loss in signal integrity which may affect data.
When would you use a serial cable?
A serial cable is a cable used to transfer information between two devices using a serial communication protocol. The form of connectors depends on the particular serial port used. A cable wired for connecting two DTEs directly is known as a null modem cable.
How do I know if my port is DCE or DTE?
Solution(By Examveda Team) The show controllers serial 0 command will show you whether either a DTE or DCE cable is connected to the interface. If it is a DCE connection, you need to add clocking with the clock rate command.
What is a RS 485 cable?
RS-485 is an industrial specification that defines the electrical interface and physical layer for point-to-point communication of electrical devices. The RS-485 standard allows for long cabling distances in electrically noisy environments and can support multiple devices on the same bus.
How many wires are in a serial cable?
The RS-232 Standard Although RS-232 does not specify connector configurations, two have become de facto standards: DB25 (a 25-pin connector, in which usually no more than 10 wires are used), and DB-9 (a 9-pin connector, in which usually all 9 wires are used).
What is RS-232 cable used for?
A serial port complying with the RS-232 standard was once a standard feature of many types of computers. Personal computers used them for connections not only to modems, but also to printers, computer mice, data storage, uninterruptible power supplies, and other peripheral devices.
What does RS-232 stand for?
Recommended Standard 232
In telecommunications, RS-232 or Recommended Standard 232 is a standard originally introduced in 1960 for serial communication transmission of data.
What is the maximum distance for Cat 6 cable?
328 ft
What is the maximum allowed length for a Cat 5e / Cat 6 cable? For Ethernet copper cabling when used for 10/100/1000BASE-T, the maximum allowed length of a Cat 5e / Cat 6 cable is 100 meters (328 ft).
Are serial ports still used?
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.
What is the difference between serial DCE and serial DTE?
The term DTE Data Terminal EQUIPMENT is used to describe the initiator or controller of the serial connection, typically the computer. A PLC is defined as a DTE device. The term DCE Data Communications EQUIPMENT describes the device that is connected to the DTE device such as a modem.
Is a router a DCE or DTE?
The router is the DTE (Data Terminal Equipment) and the external device is the DCE (Data Communications Equipment), where the DCE provides the clocking.
What is the difference between EIA-485 and RS485?
RS-485, also known as TIA-485(-A) or EIA-485, is a standard defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced, and multipoint systems are supported.
Are serial cables still used?
Does TX Go to Tx or Rx?
It’s important to note that those RX and TX labels are with respect to the device itself. So the RX from one device should go to the TX of the other, and vice-versa.