Reverse Engineering Stack Exchange
Reverse Engineering Stack Exchange

Questions tagged [serial-communication]

Process of sending data one bit at a time, sequentially, over a communication channel or computer bus. Most of the computer systems, and especially embedded systems, have such communication port.

97 questions
11
votes
2 answers

Reverse engineer Logitech Z906 serial console: getting started

I would like to control my logitech Z906 remotely, e.g. with a webservice running on a raspberry pi connected to it's console. The console is connected over a DB-15 port to the subwoofer. I called logitech but they were unable to provide me with…
Jens Timmerman
  • 211
  • 2
  • 6
6
votes
1 answer

Decoding serial data

I have an energy monitory and I managed to get into the feed. I got the handshake packets sorted but I am stuck on working out how to decode this data from HEX. All I know are the following values as shown on the monitor at time of dump. Pac = 81…
Piotr Kula
  • 163
  • 6
4
votes
2 answers

Anti-theft system rs485 keypad

I'm trying to recycle an Anti-theft system keypad. My goal is use this keypad as my system peripheral. This keypad is interfaced with its master device phisically using bus rs485. The first step in order to exploit this keyboard, is understand the…
Alessandro
  • 335
  • 1
  • 8
3
votes
1 answer

Help determining pinout for communications port

I have a Panasonic air conditioner that has a header on the mainboard that various optional (expensive) addon communications modules can connect into eg wifi The unit is a Panasonic Split system from the CU/CSZ20TKR range (however this connector is…
Andrew B.
  • 31
  • 1
2
votes
0 answers

LIN bus frame replacement

I am searching for a way to replace certain frames on a LIN bus network. My aim is to be able to intercept a frame in transmission, and change certain bits. Naturally, that involves recalculating the checksum. The problem I encounter is that after a…
Slav
  • 41
  • 2
2
votes
1 answer

Reverse engineering 12-byte serial packets from doorbell

I'm trying to reverse engineer the protocol used by a fairly old video intercom. Using a UART logic analyser was able to guess the baud rate, data bits, start/stop bit. It idles at 14v and pulls to GND for 0. when I press the same sequence…
user2006221
  • 23
  • 3
2
votes
1 answer

Help decoding this UART serial signal

I'm trying to break into a doorbell. It has a clearly labeled TX pin. Here's the output from my Labrador oscilloscope/logic analyzer.. I can't get it to make any sense though. Any ideas? I have the settings at 9600 baud/8/N.
justin
  • 475
  • 6
  • 13
1
vote
0 answers

Tapping into Ford SCP BUS

I'm looking to tap into the Ford SCP BUS to display text onto my dashboard on my '01 Jaguar S-Type. This car has a two row screen that displays the odometer, average fuel consumption - amongst other things. The radio also can display to this; when…
rileyhayes_
  • 11
  • 1
1
vote
1 answer

t.amp Quadro 500 DSP - calculate checksum

I'm trying to decode the protocol to control the PA amp t.amp Quadro 500 DSP (also branded as FiveO AR4). The serial interface is provided by an PL2303 interface, Baud 57600 8N1. To set volume on channel 1 I can increase from 0h00 to eg 0h3F using…
user1863017
  • 21
  • 3
1
vote
1 answer

2byte checksum for serial traffic

I'm working on an RFID reader that has partial implementation with ISO/IEC 14443-4 although not specifically compliant. I can decode a lot of the strings and understand the command base but I have not been able to crack the check sum. Read commands…
Andrew V
  • 13
  • 1
  • 3
1
vote
1 answer

What process should I follow to sniff USB serial packets and then replicate them?

Summary I'm currently using wireshark to sniff USB serial packets from a program that sends data to FPGA boards. So far I'm able to acquire the packets and data, but I'm not sure how to test each command I find. I want to develop my own program that…
SaundersB
  • 113
  • 2
1
vote
2 answers

Serial output garbage

I know you have seen this asked before but hear me out first. I have a prototype device that I am playing around with. On the main board there is a USB port, next to the port there is a FTDI FT232R chip. Next to the USB port there is a 20 pin JTAG…
Jonathan
  • 111
  • 1
  • 2
0
votes
1 answer

Reverse engineering checksum from RS-485 device

Attempting to reverse-engineer a checksum for a serial timing device that updates a display. Protocol is partly understood, however the checksum calculation specified does not produce the expected value. I would like to understand what is happening…
r a
  • 101
  • 2