Connectors are not part of RS-485 standard.
As the old joke has it, standards are so good everyone should have their own:
Here are several conflicting specifications for half-duplex RS-485 on D-shell 9-pin connectors:
- Modbus uses pins 5 and 9 and 1. Standard, section 3.5
- Digi uses 3 and 9 and 5. Ref
- Virtual Serial Port uses 3 and 7 and shell. Ref, fig 3.9
If there's something common in your industry, use that. Otherwise I'd suggest Modbus, because "RS-485 on DE-9 per Modbus standard" is easy to say, easy to check, and buy ready-made cables for.
Answer from jonathanjo on Stack ExchangeVirtual COM Port Driver
virtual-serial-port.org › serial port software › articles › what is serial port › rs485 pinout
RS485 Pinout - RS485 connector pinout and contacts
October 3, 2024 - There is no specific type of connector used to implement the RS485 protocol but in most scenarios, a DB9 connector or terminal block are employed. Specific RS485 connectors may have different pinouts.
Startech
sgcdn.startech.com › 005329 › media › sets › DB92422_manual › DB92422_Manual.pdf pdf
422 RS485 Serial DB9 to Terminal Block Adapter - DB92422
422 RS485 Serial DB9 to Terminal Block Adapter · Signal · 9 Pins · TXD- (DATA-) 1 · TXD+ (DATA+) 2 · RXD+ 3 · RXD- 4 · GND · 5 · NC · 6 · NC · 7 · NC · 8 · NC · 9 · Secure lock screws · DB9 female connector · 3.5mm pitch terminal · block connector ·
Modbus, how to connect the DB9 pins - SiePortal - Siemens
Loading · Please enable JavaScript to continue using this application More on sieportal.siemens.com
RS232 and RS485 DB9 pinouts
Hi guys. In my current project i am trying to communicate with RS232 and RS485. Both should be present but one should be active. I am using MAX3160E transceiver, which allows me to switch between RS232 and RS485. Aim is to connect them to DB9 and control the transceiver to switch. But pin... More on forum.allaboutcircuits.com
3
February 28, 2022RS485 Modbus Wiring with DB9
Good Day, I'm looking for a help regarding communication test of a Modbus network on ModScan. Please help me out in following issues: i) I've a 4 wire RS485 port available on Accuload iii.net to establish a link with another network on Modbus protocol, I'm a little confused in wiring the... More on control.com
2
June 9, 2015Standard connector/pinout for RS-485?
Standard: two screw terminals labeled + and -. See www.Modbus.org The problem with your idea is that often RS-485 requires termination resistors to prevent communication problems from reflections. So with screw terminals we can just insert the resistor. If anything make it plug-in. That way it is a “plug” but one I can easily wire up. With DB-9, RS-485, etc., we can’t do any of that. We are back to making goofy connectors by hand. The pins require special tools and often fall out. DB9 was used because DB25 was huge. DB25 existed for mouse immunity with every other pin grounded back in the teletype days with massive noise problems if the day. Connections were still soldered so a hollow pin made lots of sense at that time. Plus DB9 is already associated with RS-232. RJ-45 is Ethernet. Reusing these (which some vendors do) just creates confusion. If I see DB9, there’s a 95% chance it’s RS-232. There are vendors who do this (Allen Bradley) and it causes nothing but problems. People are constantly trying to plug an Ethernet device into the RS-485 “DPI” ports. Now there are exceptions and this is also why AB and others do it. A common configuration is where you have say an RJ-45 or RJ-11 or RJ-12 6P6C connector bug two pins carry 24 V and ground abc 2 carry RS-485/Modbus. This is a “remote keypad” port used on a lot of VFDs on the market. It has the convenience that the port can double as a programming or networking port and that if the factory cable breaks you can get a new one anywhere. More on reddit.com
11
2
July 26, 2022Which DB9 pins carry RS485 signals?
Pin 1 is Data+ (A/non-inverting) and Pin 2 is Data- (B/inverting). Pin 5 is signal ground. All other pins are typically unused.
industrialmonitordirect.com
industrialmonitordirect.com › industrial monitor direct › knowledgebase › rj12 to rs485 db9 wiring guide for industrial converters
RJ12 to RS485 DB9 Pinout Wiring Diagram & Conversion Guide – ...
What is the standard RJ12 to RS485 pinout?
No universal standard exists. RJ12 pin 1 typically maps to RS485 Data+ (A) and pin 2 to Data- (B), but manufacturer implementations vary significantly.
industrialmonitordirect.com
industrialmonitordirect.com › industrial monitor direct › knowledgebase › rj12 to rs485 db9 wiring guide for industrial converters
RJ12 to RS485 DB9 Pinout Wiring Diagram & Conversion Guide – ...
Can I use any RJ12 to DB9 cable for RS485?
No. You must verify the pinout mapping matches your specific equipment. Incorrect wiring can damage transceivers or cause communication failures.
industrialmonitordirect.com
industrialmonitordirect.com › industrial monitor direct › knowledgebase › rj12 to rs485 db9 wiring guide for industrial converters
RJ12 to RS485 DB9 Pinout Wiring Diagram & Conversion Guide – ...
Videos
Top answer 1 of 3
13
Connectors are not part of RS-485 standard.
As the old joke has it, standards are so good everyone should have their own:
Here are several conflicting specifications for half-duplex RS-485 on D-shell 9-pin connectors:
- Modbus uses pins 5 and 9 and 1. Standard, section 3.5
- Digi uses 3 and 9 and 5. Ref
- Virtual Serial Port uses 3 and 7 and shell. Ref, fig 3.9
If there's something common in your industry, use that. Otherwise I'd suggest Modbus, because "RS-485 on DE-9 per Modbus standard" is easy to say, easy to check, and buy ready-made cables for.
2 of 3
4
No, because the RS-485 standard itself does not define any connector or any pinout, among many other things that the standard does not define.
Also a DB9 connector does not exist, but I will assume you mean DE9 connector.
However, many other standards that build on top of the RS-485 standard do define a connector and a pinout. So this means there can be many different pinouts used by many different standards on DE9 connector.
Just pick a pinout that is commonly used, standard or non-standard.
Many other differential buses that don't use RS-485 but still have rather compatible cabling and might use a DE9 connector in practice do exist.
Scribd
scribd.com › document › 905852875 › 9pin-Details
RS485 DB9 Female Pinout Details | PDF
JavaScript is disabled in your browser · Please enable JavaScript to proceed · A required part of this site couldn’t load. This may be due to a browser extension, network issues, or browser settings. Please check your connection, disable any ad blockers, or try using a different browser
Digi
docs.digi.com › resources › documentation › digidocs › 90001537 › references › r_rs_485_db9_on_connect.htm
RS485 DB9 on Connect Products
This Wiki page directly covers products which use a standard DB9 serial port (a DTE or PC-like port).
Alicat
documents.alicat.com › pinouts › DOC-PINOUT-DB9.pdf pdf
DB9 (Male and Female) Standard Pinout
DB9 (Male and Female) Standard Pinout · Always identify proper wiring via continuity check & color when using multi-strand cables. The calibration certificate for the device should be used as the definitive reference for custom wiring options. Note: Do not connect RS-485 to RS-232 units or cables.
DFRobot
dfrobot.com › home › prototyping & accessories › electronics › headers › db9 female connector for rs232/rs422/rs485
DB9 Female Connector For RS232/RS422/RS485 - DFRobot
DB9 Female Connector For RS232/RS422/RS485
Quality DB9 female connector for RS232, RS485, RS422 interfaces, solder tail package. Maximum cable length varies by baud rate, up to 1000ft at 4800 baud.
Price $0.39
Industrialmonitordirect
industrialmonitordirect.com › industrial monitor direct › knowledgebase › rj12 to rs485 db9 wiring guide for industrial converters
RJ12 to RS485 DB9 Pinout Wiring Diagram & Conversion Guide – Industrial Monitor Direct
3 weeks ago - Converting RJ12 to DB9 RS485 requires understanding that no universal pinout standard exists.
Raveon
raveon.com › ApplicationNotes › AN236(SerialComm).pdf pdf
Serial Communications RS232, RS485, RS422
provide both RS422 and RS485 interfaces. RS-422 Multi-Drop and 4-Wire RS485 can be ... The RS-232 is usually a 9-pin serial I/O connector. Computers often have DB9 solderless · RS232 D-SUB serial connector with a 9-pin Port Terminal. On radio modems, it is a female
Opengear
portal.opengear.com › s › article › RS232RS422RS485standardDBconnectorpinout661d308e7cf0c
RS232, RS422 & RS485 standard DB connector pinout - Opengear
July 26, 2012 - Opengear - RS232, RS422 & RS485 ... Transmit Signal Element Timing25 Unassigned Location of Pin 1 on DB connector FEMALEMALE25 pin DB259 pin DB98 pin RJ45 RS422 and RS485 DB9 pinout...
Siemens
sieportal.siemens.com › en-us › support › forum › posts › - › 120753
Modbus, how to connect the DB9 pins - SiePortal - Siemens
Loading · Please enable JavaScript to continue using this application
All About Circuits
forum.allaboutcircuits.com › home › forums › hardware design › digital design
RS232 and RS485 DB9 pinouts | All About Circuits
February 28, 2022 - But is it proper to connect them to pin1 and pin4 which are actually DCD and DTR pins of standard DB9 pin layout? What is the difference between RTS/CTS flow control and DTR/DSR/DCD on the hardware side? Thanks in advance. edit: This is another configuration I wonder if it is proper: Click to expand... Unfortunately there are many "standards" depends if its a male or female, and if its a DTE or a DCE !!
Scribd
scribd.com › document › 651399623 › 485SD9R-Startup
RS-485 DB9 Female Pinout Guide | PDF | Equipment
It allows 2-wire half-duplex communication between an RS-232 device and an RS-485 network. The converter uses pins 3 and 2 on the RS-232 side to pass through transmit and receive signals.
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 - Figure 3: RS-422/485 female DE-9 plug with connections required for loopback test
INTEG Process Group
jnior.com › home › blog page › rs-485 wiring
RS-485 Wiring - INTEG Process Group
November 11, 2024 - Signal DB-9 -------------------- ------ Signal Ground (GND) 5 RS485 TX- 2 RS485 RX- 3 RS485 RX+ 7 RS485 TX+ 8 · You can make wiring of the DB9 connector easier by obtaining a breakout board like this one from Amazon.
US Converters
usconverters.com › index.php
RS232 Pinout : U.S. Converters LLC, Serial Data Communication
Below is the pinout of a typical standard male and female 9-pin RS232 connector, this connector type is also referred to as a DB9 connector.
ETechnoG
etechnog.com › 2022 › 02 › rs-232-pinout-db9-pinout-rs-485-pinout.html
RS 232 Pinout, DB9 Pinout, RS 485 Pinout Diagram Explained - ETechnoG
December 1, 2024 - Here, you can see the pinout diagram ... number 1. It is a DB9 Male connector. For a female connector, the upper right side to the left is to be counted from number 1....
ShowMeCables
showmecables.com › blog › post › DB9-Connector-Pinout
DB9 Connector Pinout | ShowMeCables.com
June 28, 2023 - When building or repairing DB9 cable assemblies many customers request a DB9 connector pinout reference drawing in order to determine where each conductor of the cable should be terminated to. There are several primary types of DB9 connector pinout schemes that we will review in blog post. ... First, we will take a look at the DB9 connector pin locations for a male and female DB9 connector.
Brainboxes
brainboxes.com › home › pinouts - how do i wire my brainboxes db9 serial port for rs485 half-duplex ?
How do I wire my Brainboxes DB9 serial port for RS485 Half-Duplex ? | Brainboxes Documentation
1 week ago - We often receive requests for how to wire our serial products which feature a DB9 connector in a Half-Duplex configuration. The following will outline the pinouts for Brainboxes RS-485 DB9 serial devices, and how they can be connected both to another Brainboxes serial device, but also to an RS485 ...
Control.com
control.com › home › forums › communication › modbus
RS485 Modbus Wiring with DB9 | Automation & Control Engineering Forum
June 9, 2015 - >PIN 3 for D+ & PIN 7 For D- > >Then check at which com port the DB9 connector is >connected. > >Then set Baud rate (9600 ) Parity ( none ) Stop bit ( 1 ) as >you have set in transmitting device .....