Questions tagged [rs232]

it refers to the standard for serial communication transmission of data.

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How do I Continuity Test/Troubleshoot a Linksprite RS232 V2 Shield?

I have a Linksprite RS232 v2 adapter (which uses a MAX232 chip), as per this image. I have soldered on the headers and tested the pins to make sure there are no solder bridges. I have set the jumpers ...
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627 views

Cannot upload to otherwise working bootloaded ATmega328P via RS232: “programmer is not responding”

I have an ATmega328P on a breadboard with the following circuitry around it: The ISP is a Tiny AVR Programmer. The RS232 to USB converter is this thing. Following is the test program I use: void ...
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111 views

How can i read and write the data from a Delta plc-s series through Arduino UNO?

I am trying to communicate PLC with arduino through rs232 as well rs 485. But, I am not able to read and write data. I can observe the data in PLC through ladder logic but not in arduino. I am trying ...
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44 views

Flow control between ESP32 and RS323 device

I'm trying to communicate an RS232 device with an ESP32 (Heltec Wifi/LoRa 32 v2) my problem is that I don't receive any response from the device, doing some research, I'm thinking that the trouble can ...
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206 views

can ModbusRtu.h library send data from slave to master using modbus(RS485) module?

i am using ModbusRtu.h library for modbus protocol. it works for sending data from master to slave but it can not send data from slave to master. master code: #include <ModbusRtu.h> #define ...
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35 views

Serial throughput using AltSoftSerial on Arduino

My project involves a commercially available device that can be remotely controlled by a computer over RS232. I'd like to put an Arduino Pro Mini, which has a second serial port provided by the ...
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1answer
332 views

Communicating with Arduino Mega 2560 Serial ports through x2 RS232

I am trying to driver a stepper motor using an Arduino Mega 2560. There will ideally be two RS232 signals being read into / written from the Arduino, each using male USB 3.0 connectors; one of these ...
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27 views

Can I use an atmega32u4 like an ftdi232rl?

Hey all since the 32u4 has built in USB I was wondering if I could make it into a FTDI232rl so I can send serial to usb commands. What I am looking to send it this: Any info on if and how I can do ...
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134 views

Arduino RS232 Shield with SD Card conflict

I have an Arduino Mega with a Ethernet2 Shield + RS232 Shield SD Card works well with Ethernet2 Shield, but it get a conflict when I add the RS232 Shield. Both hardware use the same PIN: #define ...
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747 views

Connect Arduino to PLC (Data Exchange)

The Arduino should read data from a PLC. Has anyone experience with this? What would be possible interfaces? I would prefer OPC-UA, but all the research I did, only OPC-DA was mentioned. Thanks in ...