What is RS-232 null modem cable?
A null modem cable is a RS-232 serial cable where the transmit and receive lines are crosslinked. In some cables there are also handshake lines crosslinked. In many situations a straight-through serial cable is used, together with a null modem adapter. The adapter contains the necessary crosslinks between the signals.
What is a USB null modem cable?
The USB to Null Modem Serial Adapter Cable (1-Port) converts an available USB 1.1 or 2.0 port into an RS232 Null Modem serial DB9 port, solving DCE/DTE conflicts directly, without requiring additional cross-wired serial cables or adapters.
Can you convert USB to RS-232?
A USB to serial adapter, also referred to as a USB serial converter or RS232 adapter is a small electronic device which can convert a USB signal to serial RS232 data signals. RS232 is the type of signal which is in many older PCs and is referred to as a serial COM port.
What is USB to RS-232 cable?
The Rts (Radhey Techno Servies) RS-232 USB to Serial converter is the perfect solution for transferring data from a PDA or digital camera. The USB to DB9 provides a connection between an available USB port and the more traditional RS-232 serial port found on many devices.
What is the difference between null modem and RS-232 cables?
Null modem, also called crossover, is a term associated with serial (RS-232) cables. A standard serial cable, also called an AT cable, has the wires inside the cable running straight through. Take a DB9 cable as an example. Pin 1 on one end of the cable would be connected to Pin 1 on the other end.
Is RS232 the same as USB?
Although RS232 and USB (universal serial bus) are both serial communication standards to connect peripherals to computers, they are totally different in design. There are however converter modules and cables that can be successfully used to connect RS232 devices to computers via an USB port.
Is RS232 same as VGA?
But I’m curious because you say that the connectors look “exactly like VGA ports.” Usually RS232 utilizes a DB9 (DE9 for the educated and/or purist) with is the same size as a VGA (HD15) but has only 9 pins in two rows instead of 15 pins in three rows.
Does USB use RS232?
Most commonly the USB data signals are converted to either RS232, RS485, RS422, or TTL-level UART serial data. The older serial RS423 protocol is rarely used any more, so USB to RS423 adapters are less common.
Are there different types of RS-232?
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.