standard for serial communication
Factsheet
EIA-232 Standard Interconnection of Data Terminal Equipment with a Communications Channel
Status Active
Year started 1960 (66 years ago) (1960)
EIA-232 Standard Interconnection of Data Terminal Equipment with a Communications Channel
Status Active
Year started 1960 (66 years ago) (1960)
Wikipedia
en.wikipedia.org › wiki › RS-232
RS-232 - Wikipedia
1 week ago - In October 1963, the EIA published its first revision, EIA RS-232-A. This revision introduced iterative improvements including different connector types and different voltage ranges. In October 1965, the EIA published EIA RS-232-B. This revision increased the capacitance specifications to allow longer cable lengths and increase signal timing. It also dropped the voltage from 25 Vpp to 15 Vpp. In August of 1969, the EIA published EIA RS-232-C: Interface Between Data Terminal Equipment and Data Communication Equipment Employing Serial Binary Data Interchange.
Eaton
tripplite.eaton.com › products › rs-232-serial-to-usb-adapters
RS232 Cable and Connectors Explained - Tripp Lite - Eaton
Since RS232 devices signal using higher voltages, the adapter also needs a "level shifter" to boost the signal voltage up to the level expected by the RS232 receiver and a transient suppressor to protect the USB circuitry from damage. USB to RS-232 Serial Adapter USB to RS-422/RS-485 Serial FTDI Adapter · What is the difference between a serial cable and a parallel cable?
rs232 - What is a 3 wire type cross linked serial cable? - Electrical Engineering Stack Exchange
I'm trying to use a controller which uses Serial communication with the PC. The documentation says I need to get a 3 wire type cross link serial cable. Is this a null modem cable? The following i... More on electronics.stackexchange.com
What is the use of this cable?
RS-232 Serial port to RJ11 (maybe RJ12). Lots of possible devices such as a 2-line LCD display, scale, barcode scanner, cash drawer, etc. Pretty common in PoS (Point of Sale) systems. More on reddit.com
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July 1, 2024Nowadays what are the uses of serial ports?
They work. They're the 'simplest' form of communication that almost every chip supports. I would bet even your phone has UART pads broken out. More on reddit.com
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July 26, 2018Are there still new laptops that can be had with an RS-232 serial connector onboard?
If you are putting together a crash bag I'm sure you'll already need to have a couple of db9 to rj45 cisco style console adapter cables. Probably also a couple of Micro-USB to USBA/C cables as well for switches that use that for console and maybe even a couple of db9 gender changers and null/crossover adapters. With all that stuff you might as well just add a USB-Serial cable rather then trying to find a laptop with a serial port and then being stuck if something happens to the laptop. I picked up a bunch of Keyspan/Tripp Lite USA-19HS back in the day and they've been working great. I've found that it's easy to find a USB to Serial cable that works at 9600 but most of the cheap ones break down if you try to connect at 115200. One important thing to include in your kit is a USB stick with drivers on it for whatever USB to Serial cable you settle on. More on reddit.com
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November 28, 2023Videos
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How to Make a USB to RS232 Serial Cable (Pick the Right Converter) ...
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How to Wire RS232 Connections - YouTube
10:56
RS-232 Explained: Working Principle, Pinout, Cables & Applications ...
08:27
RS232 DB9 Termination + Testing - Step-by-Step Guide - serial
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RS-232: The Ancient Cable That Still Runs Modern Machines #rs232 ...
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RS232 Explained in 2 Minutes (Serial Communication + Wiring Basics) ...
AV Access
avaccess.com › blogs › guides › what-is-rs232
RS232 Serial Port: 7 Facts You Need to Know before Using
October 19, 2023 - RS232 and RS485 are both serial communication standards, but RS232 is designed for point-to-point communication, while RS485 is designed for multi-drop communication. RS232 uses a single-ended communication scheme, while RS485 uses a differential ...
Virtual COM Port Driver
virtual-serial-port.org › virtual serial port driver › articles › what is serial port › rs232 pinout
All you have to learn about serial connector pinouts
October 3, 2024 - The RS232 protocol specifies the operation mode, electrical standards, number of bits, and voltage levels to be used when transferring data between a DTE and DCE. ... Serial communication devices make use of 9 or 25 pin D-type connectors for their ...
Computer Cable Store
computercablestore.com › home › info center › articles › network tools and adapters
RS-232 Serial Cables | Signals, Pinouts, and Applications | Computer Cable Store
The most popular of these is the DE-9, commonly (and incorrectly) referred to as DB9. Either or both of these connectors can be used for a serial cable. There are two general types of RS-232 serial cables: standard straight through cables (wired 1-1, 2-2, 3-3, etc.), and null modem cables.
CircuitDigest
circuitdigest.com › article › rs232-serial-communication-protocol-basics-specifications
RS232 Serial Communication Protocol: Complete Guide, Pinout & Applications (2025)
May 29, 2025 - Standard DB9 to DB9 cables are most common for modern applications. Most modern computers lack built-in RS232 ports, but USB-to-RS232 converters provide excellent compatibility. These adapters create virtual COM ports that work with existing ...
US Converters
usconverters.com › understanding-rs232-comprehensive-guide-to-cables-and-connectors
Understanding RS232: Comprehensive Guide to Cables & Connectors : U.S. Converters LLC, Serial Data Communication
Common RS232 connectors, including DB25, DB9, and DB15, each have distinct pin arrangements and applications, with the DB9 being the most widely used in contemporary serial devices. RS232 communication relies on effective cable characteristics, signaling for flow control, error detection methods, ...
Coolgear
coolgear.com › home › industrial usb to serial adapters | rs232 rs422 rs485 | com port retention › serial cables
Serial Cables - Coolgear
Our serial cables are designed to ensure seamless connectivity between devices such as computers, terminals, printers, and industrial equipment. Available in different lengths and configurations, Coolgear’s serial cables support RS232, RS422, and RS485 standards, providing robust solutions for your serial communication needs.
Cable Leader
cableleader.com › cables › serial cables › rs-232 serial cables
RS-232 Serial Cables | DB9 Male to Male & Female | CableLeader
RS-232 serial cables typically feature two types of connectors: DB9 male and DB9 female.
TALtech
taltech.com › support › serial_intro
RS232 and Serial Communications – TAL Technologies
Both 9 and 25 pin serial ports on a PC will always have a male connector. If you connect two DTE devices (or two DCE devices) using a straight RS232 cable, then the transmit line on each device will be connected to the transmit line on the other device and the receive lines will likewise be ...
RealPars
realpars.com › blog › rs232
What Is RS232 and What Is It Used For? - RealPars
One important thing to remember if you find yourself using RS232 devices is that there are actually two different types. DTE stands for Data Terminal Equipment. A common example of this is a computer. DCE stands for Data Communications Equipment. An example of DCE is a modem. The reason this is important is because two DTE or two DCE devices cannot talk to each other without some help. This is typically done by using a reverse (null-modem) RS232 cable connection to connect the devices.
Cables
cables.com › home › serial cables - rs-232
Serial Cables - RS-232
RS-232 Serial Cables RS-232 is used for connecting serial ports in computers. The most popular serial connector is DB9. We carry them with male or female connectors, and offer them in straight through and null modem configurations.
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Yes - I would call that a Null Modem cable.
If the cable you get (or make) doesn't work, my first debugging step for serial communications is to swap connections on pins 2 and 3. (Transmit and Receive data)
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Since the TXD (3) of one side is connected with the RXD (2) of the other, this is indeed a null-modem cable. Normal serial cables have pins 2 and 3 connected straight through, and the DCE is responsible for cross-connecting them internally.
Analog
analog.com › home › resource library › technical articles › fundamentals of rs-232 serial communications
Fundamentals of RS-232 Serial Communications | Analog Devices
November 4, 2025 - As we have seen, the cable-length specification once included in the RS-232 standard has been replaced by a maximum load-capacitance specification of 2500pF. To determine the total length of cable allowed, one must determine the total line capacitance. Figure 6 shows a simple approximation for the total line capacitance of a conductor.
ShowMeCables
showmecables.com › by category › bulk wire & cable › multi-conductor › serial
Bulk RS232 Serial Cable - DB9 Modem Cables, CM, PVC, Multi-Conductor Cord, 22 - 26 AWG, 1000 ft, DB15, DB25 | ShowMeCables.com
ShowMeCables offers a wide range of high-quality bulk RS232 serial cable for indoor use. These serial cables are available in different specifications to meet the needs of different applications. ShowMeCables DB9 modem cables (the same as RS232 serial cables) are available in 1 to 4 number of pairs with 22, 24 and 26 AWG sizes.
Delta Motion
deltamotion.com › support › webhelp › rmcwin › Communication_Types › RMC_CPU_RS232_Port › RS_232_Wiring.htm
RS232 Wiring
There are two versions of the serial port for the RMC product. The current style is a male DTE DB9. Early production RMCs have a female DTE DB9. However, because both connectors are DTE, the wiring is the same, so only a gender changer is needed to convert a cable between the two ports.
Solis PLC
solisplc.com › tutorials › rs232
What is the RS-232 Protocol, What it's used for, and RS232 Serial Communication in Industrial Automation
Figure 6.1: RS-232 protocol - Communication between DTE and DCE · You can select from different RS-232 cable types, including straight-through cables, null-modem cables, and crossover cables, each tailored to meet distinct connection requirements.
Lammert Bies
lammertbies.nl › home › tutorials on computer interfacing › cables for data interfacing › rs232 serial cables pinout
RS232 serial cable pinout information - Lammert Bies
August 18, 2021 - Only very few computers have been manufactured where both serial RS232 channels are implemented. Examples of this are the Sun SparcStation 10 and 20 models and the Dec Alpha Multia. Also on a number of Telebit modem models the secondary channel is present. It can be used to query the modem status while the modem is on-line and busy communicating. On personal computers, the smaller DB9 version is more commonly used today. The diagrams show the signals common to both connector types in black.
GlobalSpec
globalspec.com › ds › 3093 › areaspec › serial_rs232
RS232 Serial Cables | GlobalSpec
USB to RS232 Converter Cable 1.0 meter -- UMC-201 from L-com, Inc. These easy to install USB to Serial converter products allow you to Connect a USB port on a PC or laptop to legacy RS232 devices such as PDA's, GPS systems etc. These USB to Serial converters feature DB9 male connectors for the RS232 connection and a USB type A Male connector for the PC or Laptop...
Arcelect
arcelect.com › rs232.htm
RS232 Tutorial on Data Interface and cables
Category 5 cable is available as shielded twisted pair (STP) as well as unshielded twisted pair (UTP) and generally exceeds the recommendations making it an excellent choice for RS232 systems. ... In this document the term RS232 will be used when refered to this serial interface.