Questions tagged [db9]
The db9 tag has no summary.
39 questions
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Confusion assigning correct pins and DTE/DCE terms for RS232 communication using MAX3232
I want to control a hardware device which is controlled by its RS232 interface and it has female DB9(DE-9) port for serial communication. Normally the hardware device is controlled via a PC's serial ...
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1
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342
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What do the different LED lights indicate on a DB-9 tester and what can I infer from them? [closed]
I have a machine with an RS-232 port. When I power ON the machine and connect the DB-9 tester all the machine's troubleshooting guide requires is to check if the RTS light is green. I see there are ...
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2
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1
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How can I use a serial port to listen to if a toggle is switched?
Using a PC and writing some software I want to detect if a user toggles a small electric switch with as little external hardware as possible. I was thinking that maybe I could use a USB to serial ...
- 305
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Can0 return no data, but with no error
I'm actually trying to get data from a CAN on vehicle connected by DB9 on my raspberry. The DB9 provides also energy to the raspberry (here the material that i'm using).
I've followed every of these ...
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-1
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1
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Doubts about Max232 IC chip
I have a Max 202 Ic and Max 232 Ic
I currently want to make a USB to RS232 Serial Db9 converter
i have the db9 male port, a max 232 and max 202 , usb female port and bunch of other passive components ....
1
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3
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2k
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PS/2 keyboard with RS232 (DB9) workstation port
I'm currently awaiting for dispatch/delivery of a 1995 PS/2 Model M keyboard w/attached flat cable but a missing PS/2 plug
It seems those flat cables were not very sturdy.
(Yes, I checked the model ...
- 53
0
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2
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1k
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12V/5A power through DB9
Required to use a DB9 connector to pass DC to unit requiring 12V/5A supply. An easy way to do that is using a DB-9 to Terminal Block adapter. But most DB-9 to TB adapters I see have 3 A or less ...
- 165
2
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2
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CAN bus DB9 pinout standards
There are two standards for DB9 pinouts when it comes to CAN bus.
This seems to be the industrial version. I've seen it in PLCs and VFDs.
7 - CAN-H
2 - CAN-L
3 - GND
6 - GND
9 - VBAT
This seems to ...
- 7,502
0
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1
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419
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Using DB9 connectors for LVDS signals
Has anyone utilized 9-pin DB9 connectors for driving and receiving LVDS signals? I wanted to use Micro-D connectors on a board I am developing but they take too long to get. Since DB9 connectors are ...
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3
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738
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Help wiring a Raspberry Pi and odd DB9 connection
I need to send a signal from a Raspberry Pi 4 to a PC running software that listens on a COM port and I'm having some trouble understanding the necessary wiring.
Here is the documentation I have for ...
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3
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Is it common practice to connect power supply to a DB9?
I got a project where many sensors which uses CAN were connected to a DB9.
And sensor power (24V and GND) too. I want to connect the DB9 terminal to power however how can I do it in a safe way? If I ...
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1k
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-2
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2
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What's the difference between a null modem cable and a gender changer? [closed]
Please ignore this question. It doesn't address the problem I was trying to solve (XY problem) and my edits have been reverted. Because it has answers, I can't delete it. It should be closed as off-...
- 180
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1
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Does this wiring pattern for a DB9 cable exist as a standard cable?
I have a scientific instrument that uses a DB9 cable to connect to the standard RS232 port on a computer for communication. I've deconstructed one of the cables as I needed to make another one but I ...
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1
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CAN communication on tms320f28377s using usbToCan driver with db9 connector
I am using launchpad xl f28377s. It has a CAN transceiver which is intagreted. How can I connect this card to usbToCAN ixxat driver using db9 connector ?
Thanks,
Regards.
3
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2
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6k
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What could be the reason for this RS422 wiring?
I usually follow the following wiring scheme for RS422 wiring:
As seen above R+ to T+; R- to T-; T+ to R+ and T- to R-. So for each point to point wire R and T coupled but the signes are same i.e + to ...
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491
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How to wire RJ12 to db9f modular adaptor?
I have a RJ-12 to DB9f modular adapter. There are 6 wires that come out of the adaptor (White, Black, Red, Green, Yellow Blue) - these, as I gather from pin out diagrams, correspond to the 6 jacks of ...
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1
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Two devices on Y 9pin Serial cable to 25pin printer input - Data Corruption
I have't been able to find a solution, and was hoping for some clarity. I have 2 machines (one is a bill counter, one is a coin sorter) that both support printing over DB9 serial connection, and one ...
3
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0
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877
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RS232 using a MAX3232 chip problems [closed]
I am trying to use RS232 to TTL convertor much like this: https://www.amazon.com/MAX3232-Female-Serial-Converter-Module/dp/B00BXX2OU2 I am not sure if the chip is authentic MAXIM or some knock off.
...
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2
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2k
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3.5mm to DB9 connector (differences) [closed]
I have 2 different type of connectors of 3.5mm to DB9 that I use to send RS232 commands from device to a screen. The 3.5mm is attached to the device on the serial port and the DB9 to a serial cable ...
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2
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How to Make DB9 F/F serial RS232 mini gender changer?
I want to connect My "USB to RS232(Male end)" to my NanoVolt Meter having RS232 male port. To make both communicate i need to make DB9 F/F serial RS232 mini gender changer. Any Circuit or suggestion ...
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1
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788
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Serial DB9 to Serial 3.5mm over HDMI cabling
Good afternoon everyone.
I am trying to control a Samsung TV via Serial from a remote processor and I am trying to use spare installed HDMI cabling to do it.
Samsung does not have an open API for IP ...
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3
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How to mount a DB-9 adapter to an enclosure
I have a DB-9 connector that needs to be mounted to an electronics enclosure. This hole for the DB-9 connector will be manually cut out.
Question: How can the DB-9 connector be secured to the ...
- 1,181
3
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1
answer
387
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Capacitors for MAX232
I want to use this chip (ST3232CDR) as an RS232 transceiver. The problem is that I want to power the chip using 2 levels of voltage (3.3V and 5.0V) using a simple jumper, but in the datasheet (http://...
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3
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Db9 shield connection? in plastic hood!
at my work there are a network of identical devices each of which control some 50 location-guidance light units. These devices or controllers are all linked together and then to a main server/computer ...
- 21
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3
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5k
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Changing DB9 Gender: Crossover or Straight? [closed]
I have a USB-DB9(Male) that needs to communicate with a device that has a DB9(Male) port.
Do I connect both DB9(male) ports together using a null modem (crossover) cable or a straight through cable?
...
- 1,181
0
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1
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409
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RS485 Pinout when using PyModbus
I am trying to control a RS-485 RTU device (Love 16C-3) using a Python script (pymodbus library) that runs on a Windows 10 PC. The hardware is connected to the ...
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2
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Making a DB9 Cable
I need to make a DB9 cable due to the need to have a custom pin out. I will get a few StarTech.com DB9 Serial Male D-Sub Crimp Connector (C9PCM) to get started.
What crimping tool do I need to secure ...
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DB9 male or female Connector in Board
In my design I am using RS232 with DB9 connector in my PCB. idea is to log the data in PC and for programming via serial. Which connector I need to use in my board , it is male DB9 or female DB9.
Q1) ...
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Extra 2 DB9 pins connection
Many DB9 symbols have 2 additional pins other than the 9 signal and GND pins that they are known for. How and to what are these 2 pins connected ? Pins 10 and 11.
Is it connected to chassis ground or ...
- 1,987
2
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2
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5k
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Voltage Conversion In PC Serial (DB9) Port
First of all, I am not even a noob when it comes to electronics. I don't even know what I am asking is possible but here it comes.
At first glance, it may seem as an computer-related question, but ...
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4
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What is a 3 wire type cross linked serial cable?
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 ...
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Pin assignment on rj45 when using rs232
I am having a problem creating a cable to connect with two devices. The first devisce is an Intellivue MP70 that I want to connect to the RS232 port using an RJ45 end. On the other side there should ...
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2
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Straight vs Null Modem Serial cable confusion
I have a cable having a DB 9 male at one end and a female at another end. I will be using this cable to connect BeagleBoard Xm ver C1 to the serial port of my PC. I understand the pins with respect ...
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3
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Can I connect a "J1708" port to my computer?
This question is related to another question I posted here on the new Reverse Engineering site.
I'm working with a small public transit agency on a neat open-source project that will help us to offer ...
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1
answer
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Is there any standard which defines that a particular connector or header on PCB has to be male or female?
Is there any standard which defines that connector (DB9, DB25, USB or header) type has to be MALE or FEMALE while choosing one to use on circuit board?
I am designing a microcontroller circuit board ...
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How do I do the 6 pin RJ11 to RS232 female serial adapter wiring?
I'm new to wiring and I have this RJ11 to DB9 RS232 adapter, and I'm not sure how to correctly insert the RJ11 wires into the DB9 female end. http://www.blackbox.com/Store/Detail.aspx/DB9-RJ-11-...
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2
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Is my SparkFun RS232 Shifter SMD faulty?
Product Link
I am connecting this to an Arduino. (once Arduino programmed I removed the USB connector as it shares the serial comms with Pin0&1)
RS232<->Arduino
VCC <-> 5V
GND <-> GND
...
2
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5
answers
12k
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Questions about wires in a DB9 cable
I stripped a DB9 extension cable which I will use to connect to a DB9 connector on one end and an RJ45 on another. I need to make connections to pin 2, 3, and 5 on the DB9 side.
When I stripped the ...
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