Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [db9]

37 questions
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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) What connector I need to use in my board male or…
4Mhz Crystal
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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-Adapter-Kit-Female/FA067?CAWELAID=414464303 I've…
Jeremiah Malina
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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 realtime data to local developers. A key piece…
drewbug
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RS232 using a MAX3232 chip problems

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. When I connect the convertor to the rs232 device…
Greg S
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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…
A. Kier
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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 cable? Here are the pins of the serial cable: Before…
Andy
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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 for general use.
Osaid
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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 be automotive. The only place I have seen it is in…
vini_i
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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 + or - to -. The above wiring scheme was…
floppy380
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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 please bear with me. One of my friends brought me…
SercioSoydanov
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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 TX <->Pin0(RX) RX <->Pin1(TX) Seems simple enough. However when…
Richard Freedman
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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 DB9 wire, I was surprised to find 5 wires, since…
200ok404notfound
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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 to the following image: Now this document says…
gpuguy
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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 number, it's PS/2). Once cleaned up and checked…
Groucho
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How should I mount DB9 Connector?

How do I mount that DB9 Connector on this GPB? Any tricks?
MaNyYaCk
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