Aggsoft
aggsoft.com › rs232-pinout-cable › modem-db9-to-db25.htm
RS232 Serial Modem Cable (DB9-DB25)
Pinout and signals for building a cable for RS232 serial modem (9pin - 25pin). Wiring diagrams and signal details included.
shadeBlue Help Desk
support.shadeblue.com › hc › en-us › articles › 114094174832-RS232-RS422-RS485-DB9-DB25-serial-port-pinouts-and-loopback-wiring
RS232 / RS422 / RS485 DB9 & DB25 serial port pinouts and loopback wiring – shadeBlue Help Desk
October 27, 2016 - When using hardware flow control, you will need to connect pins 4 to 6 and 7 to 8 for RS-232. Pins 7 and 8 are used for RTS/CTS hardware flow control where pins 4 and 6 are used for DTR/DSR hardware flow control.
[SOLVED] Plotter cable DB9 to DB25 pinout?
Hi, Long time lurker first time poster (I think). I'm wondering if anyone could help me figure out the pin-out for a DB9 to DB25 serial cable. A friend has this old plotter, from late 90's that has DB25 serial input. I'm trying to hook it up to a DB9, actually USB -> DB9 ->DB25. (the USB to... More on forum.allaboutcircuits.com
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August 20, 2021Rs-232 DB9 to DB25 cable pinouts
Hello everyone, How important is it to obtain cable pinouts from a vendor whem connecting a device with DB9 connector to a device with DB25 connector? Trying to avoid comms issues, and making sure we are specifying appropriate cable for the application( null modem cable vs. Straight-thru)... More on plctalk.net
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July 4, 2022Digi International
digi.com › support › knowledge-base › edgeport-rs-232-db9-and-db25-pinout-information
Edgeport RS-232 DB9 and DB25 pinout information | Digi International
Select your product for firmware, drivers, software, knowledge base articles and manuals
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 - As most of the computers are equipped with the DB9 serial port version, all wiring examples on this website will use that connector as a default. If you want to use the example with a DB25, simply replace the pin numbers of the connector according ...
Electronic Theatre Controls
support.etcconnect.com › faq
RS 232 Pinouts for DB25 and DB9 Connectors - Electronic Theatre Controls Inc
January 21, 2025 - Skip to main content · ETCconnect · Forums · Find A Dealer · Contact Us · RS 232 Pinouts for DB25 and DB9 Connectors · Last updated · Save as PDF · Pins commonly used for RS-232 (serial): · Commonly used RS232 Null Modem Pin out for DB25 and DB 9 connectors:
Metabee
metabeeai.com › home › blog › rectangular connectors › d-sub connectors › db9 to db25 pinout and wiring explained: how rs232 connections work?
DB9 to DB25 Pinout and Wiring Explained - MetabeeAI
February 25, 2026 - The DB9 to DB25 pin mapping defines how signals like TX, RX, and GND interconnect. Choosing the right cable type (straight vs. crossover) depends on whether you’re linking DTE to DCE or DTE to DTE devices.
Aggsoft
aggsoft.com › rs232-pinout-cable › serial-printer-db9-to-db25-cable.htm
RS232 serial printer cable (DB9-DB25)
Discover the pinout and signals layout needed to create an RS232 serial printer cable, enabling seamless communication between DB9 and DB25 devices.
Aggsoft
aggsoft.com › rs232-pinout-cable › nullmodem-db9-to-db25.htm
Null Modem Cable Pinout (DB9-DB25)
Discover the pinout and signal configurations for creating a reliable RS232 null modem cable, connecting 9-pin - 25-pin devices with precision.
Scribd
scribd.com › document › 94216798 › RS232-Wiring-Diagrams
RS232 Wiring and Pinout Diagrams | PDF | Electrical Connector | Electronic Engineering
The document provides pinout diagrams for DB25 and DB9 connectors commonly used for RS232 serial ports. It also includes examples of how to wire connections between computers, modems, and printers, noting that handshake signaling varies and may require different pin connections to be used.
All About Circuits
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[SOLVED] Plotter cable DB9 to DB25 pinout? | All About Circuits
August 20, 2021 - You can also buy 9 pin - 25 pin ... https://www.bb-elec.com/Learning-Center/All-White-Papers/Serial/What-Is-RS-232.aspx Do use a quality USB-RS-232 adapter....
Zytrax
zytrax.com › tech › layer_1 › cables › tech_rs232.htm
Tech Stuff - RS232 Cables and Wiring
We have received email suggesting that the above pinout looks like DTR from one side is driving into DSR/DCD on the other side - not normally a healthy situation. The emails miss the point that since this is a NULL modem connection both ends are DTEs. The two peer DTE's treat DSR/DCD signals as RX (INPUT) only. The INPUT DSR/DCD on one side is created by cross connecting the OUTPUT DTR signal for the other peer. Use when connecting a DB9 (e.g. a PC) to a DB25 (e.g.
Pccompci
pccompci.com › rs232-cable-technology.html
RS232 connector pin assignment - PCCOM
PCCOM RS232 RS422 RS485 Multi-port Serial card,Serial-TCP/IP Communication Product
Swindells
swindells.com › db25.htm
Connecting DB25 to DB9 serial connectors
RS232 DB25 Connector · RS530 DB25 ... and connect pins 7+8 together · Other common pinout for commercially sold DB25 to DB9 cables: 1-4 & 5, 2-2, 3-3, 4-6, 5-7, 6-20, 7 & 8-8, 9-22 ·...
Pinterest
pinterest.com › pin › rs232-db9-to-db25-converter--458452437058061478
RS232 serial cable pinout information - Pinterest
RS232 serial cable pinout information - Lammert Bies | Cable, Modem, Computer hardware · Skip to content · When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures · Log in · Sign up
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 - RS232 manages communication flowing between the DTE and DCE using serial pinouts of either the DB9 or DB25 variety. These D-sub connectors can terminate with an RS232 female pinout or DB25 or DB9 male connector pins.
PLCS.net
plctalk.net › home › forums › q & a › plc questions and answers
Rs-232 DB9 to DB25 cable pinouts | PLCtalk - Interactive Q & A
July 4, 2022 - In the DB-25 end of their SC-09 cable is hidden a protocol converter to RS-422. Click to expand... They also have a backdoor for lack of better words and a RS232 will work I sell a ton of these and there is no converter most are resellers ...
Scribd
scribd.com › document › 49307905 › RS232-serial-cable-pinout-1
RS232 Serial Cable Pinout Guide | PDF | Electrical Connector | Telecommunications Equipment
This document provides information about RS232 serial cable pinouts and connectors. It describes the pin assignments for DB25 and DB9 serial connectors as well as a DEC MMJ connector. It also includes a diagram showing how to convert between a DB25 and DB9 connector.
Firewall.cx
firewall.cx › networking › network-cabling › network-serial-cable.html
Serial Direct Cable Connection, DB9, DB25, COM Ports and Pinouts
Figure 5. Serial COM port pinouts for both DB-9 & DB-25 serial interfaces
Romtronic
romtronic.com › home › rs232 cable pinout diagrams for embedded applications
RS232 Cable Pinout Diagrams for Embedded Applications | Romtronic
September 30, 2025 - Make sure the signal ground is connected (Pin 5 on DB9 or Pin 7 on DB25) to complete the circuit.
Alibaba
electronics.alibaba.com › question › rs232-cable-pinout-guide-straight-vs-null-modem
What Is the RS232 Cable Pinout? DB9 Male/Female Wiring Explained
April 30, 2026 - DB25 Pin 4 (DTR), 5 (DSR), 6 (DSR), 8 (DCD), 20 (DTR), 22 (RI) map to DB9 pins 4, 6, 20 (not used), 1, and 9 respectively — but many adapters omit non-essential lines. ⚠️ Warning: Never assume a DB25-to-DB9 adapter is “passive” or ...