I have a pc controller at my work that is outputting about 30 hexadecimal bytes repeatedly with the first 9 bytes being control info and the latter being 19 bytes for a message and an end byte for another control character. I need to output those 19 message bytes to a LED marquee, but it also has to…

Seems workable. You should figure out the level shifting specs and schematic before you hook anything to 12v. Maybe take a look at: [image] Best first 5 topics to read to reach Trust Level 1? Serial Input Basics - updated by @Robin2 -- How to read serial input without blocking other code from …

information needed: What protocol does the LED marquee expect (e.g., serial communication, TCP/IP)? Does the marquee need special control characters for message boundaries? Are there any specific formatting rules or requirements for the message structure? To address your issue, it sounds l…

Spot on. My marquee wants the 02 (STX), an address "01", the message, and then 03 (ETX). Funny thing was whether in Hexadecimal or ASCII DEC, STX and ETX seem to be the same binary output & numbers so I was hoping to be able to send the message HEX back out to marquee with the control characters app…

[image] eperic: Funny thing was whether in Hexadecimal or ASCII DEC, STX and ETX seem to be the same binary output & numbers Check out this link, it should show way you are seeing what you are. https://www.asciitable.com/

[image] eperic: Still wonder how arduino would know when to start reading the full 30 bytes though. Did you check out: [image] Best first 5 topics to read to reach Trust Level 1? Serial Input Basics - updated by @Robin2 -- How to read serial input without blocking other code from running…

Getting ready to start hooking up and creating sketches to upload. How does this look? byte msg[29]; //byte array to store hexadecimal values not including ending control character 0x12 void setup() { Serial0.begin(1200); // opens input serial port, sets data rate to 1200 bps Serial1.begin(12…

Hi @eperic , please use the code tags (from the menue bar of the editor window): [image] It makes reading and handling of code much easier in the forum, see here: byte msg[29]; //byte array to store hexadecimal values not including ending control character 0x12 void setup() { Serial0.begin(1200)…

I guess you did not try to compile your code for a MEGA ... ?! There is not Serial0 device, the MEGA has Serial Serial1 Serial2 and Serial3 [image] As Serial is connected to the USB which is used for uploads of code and (probably helpful) for debugging purposes you might choose one of the othe…

Here is a sketch that may show a possibility to handle messages of known length between a start and a stop character: https://wokwi.com/projects/409852867075662849 Sketch: /* Forum: https://forum.arduino.cc/t/reading-hex-binary-from-pc-serial-then-output/1302803/9 Wokwi: https://wokwi.com/pr…

Thank you ec2021, the code you posted, or wrote for me, was invaluable! I extrapolated so much info from just that alone. I had problems getting the msgFound to become true which led me down a simpler path of just finding the start character and reading it and the next 20 bytes in and then writing t…

Reading Hex/Binary from PC serial then output

Other Hardware Product Design

DaveX September 18, 2024, 12:46pm 2

Seems workable. You should figure out the level shifting specs and schematic before you hook anything to 12v.

Maybe take a look at:

Topic		Replies	Views
Receiving 8 byte hex through serial Programming	17	1243	January 3, 2023
Sending hexa decimal values through serial port of Arduino Programming	20	2856	March 31, 2023
Recieving hexadecimal serial communication Networking, Protocols, and Devices	39	1048	June 3, 2024
Arduino Mega and fast serial communication Networking, Protocols, and Devices	22	642	November 6, 2024
Receiving serial with null character General Guidance	17	605	February 26, 2025

Reading Hex/Binary from PC serial then output

Related topics