• Rs232 Serial Protocol
• Serial Data Sniffer
• Free Serial Port Sniffer

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Introduction

The Teensy is a wonderful small device with a lot of power and USB capability. See the official Website for more information.

I wrote a few programs to use the Teensy as dynamic USB device. The Teensy identifies itself as an USB device that is connected on another computer.All data is transferred through the Teensy. In this stage, its also possible to use the Teensy or the Raspberry Pi to analyze and modify the transmitted data and even send own data packets.The analyzer is more a spin off and a simple project. This page can be seen as educational information.

I wrote the program for the Teensy 2.0 and Teensy 3.2. There are two Teensy programs, one for Teensy 2.0 and one for Teensy 3.2. I had some data loss with the Teensy 2.0 and so I rewrote the whole program for the Teensy 3.2, which has a different processor architecture and more features. But later, I figured out, that the data loss came from the Raspberry Pi.

Meanwhile I prefer the Teensy 3.2, because it has more RAM, more I/O ports, a faster CPU and is easier to buy. The Teensy 2.0 seems to be sold out the most times.

The source codes of the programs are currently ugly and I have to clean up the code before I release it. But they work well and can be used as base for other projects. I tested themwith various hardware. I tested it with USB gamepads/controllers and other HID devices. Mass storage devices should work too, but I test them later.

The programs are written in C and C++.

-- WARNING --

I don't take any responsibility about damaged hardware or any other things. Use the information that you read here at your own risk!Inform yourself from other sources too.

Various connection methods

The target computer is the computer, which has the Teensy connected through USB. The target computer will identify the Teensy as USB device which is connected on another computerand is called 'source USB device' in the list below.

Note: You can use any computer that is able to act as USB host instead of the Raspberry Pi.

• Teensy 2.0 connected directly with a Raspberry Pi via LLC + UART

Target computer <- USB -> Teensy 2.0 <- UART via Logic Level Converter -> Raspberry Pi <- USB -> Source USB device

Target computer <- USB -> Teensy 2.0 <- UART -> USB Serial Cable <- USB -> Raspberry Pi <- USB -> Source USB device

Target computer <- USB -> Teensy 3.2 <- UART -> Raspberry Pi <- USB -> Source USB device

Target computer <- USB -> Teensy 3.2 <- UART -> USB Serial Cable <- USB -> Raspberry Pi <- USB -> Source USB device

Target computer <- USB -> Teensy 3.2 <- UART -> Teensy 3.2 <- USB -> Raspberry Pi <- USB -> Source USB device

Teensy 2.0 connection methods

The Teensy 2.0 runs on 5V. So you need a Logic Level Converter (LLC) to connect the Teensy 2.0 directly to the UART of a Raspberry Pi, which has a logic level of 3.3V. Its quite easy to use a logic level converter.I bought a 4 Channel IIC I2C Logic Level Converter Bi-Directional Module 5V to 3.3V. You can use a 2 channel version too.

WARNING: When you don't use a LLC, then you damage your Raspberry Pi!

TODO: SOLDERING INSTRUCTIONS, MORE IMAGES

You can connect the Teensy with a with the USB Serial Converter to any computer which has the source USB device connected.I bought a USB to TTL-converter-module with builtin CP2102 which is compatible to the Teensy 2.0 5V level. The connection with the Teensy 2.0 is simple. See the table.

Rs232 Serial Protocol

TODO: PHOTO

Teensy 3.0 connection methods

The Teensy 3.2 and the Raspberry Pi have the same logic level. You can connect them directly without logic level converter.

TODO: PHOTO Tamil movie amman devotional songs mp3 free download.

You can connect the Teensy with a with the USB Serial Cable to any computer which has the source USB device connected.I bought the COM-FOUR PL2303HX USB to TTL RS232 COM Cable-Module Converter 1 meter.

Serial Data Sniffer

TODO: PHOTO

I used a second Teensy 3.2 to have more I/O pins and the second Teensy is used as USB Serial Device. Both Teensys are connected together with theirSerial 1 port.

TODO: PHOTO

Flash the Teensy

The Teensy will be flashed over USB with the Teensy Loader. There is a GUI and a CLI version available. I prefer the CLI version. See Teensy Loader CLI/GUI for more information.

Source Codes

Coming soon..

© 2019 by Elmar Hanlhofer

Designing / debugging a communication project can be very stressful and time-consuming. Many software / site engineers get stuck on the protocol before they can actually control a serial device, such as RS232, RS485, RS422, TTL, Modbus, PLC, or SCADA. Serial protocol can be very complicated; it requires that you not only understand the context of the protocol and the data format (ASCII, Hexadecimal, Binary, etc.), but you must also know how to do the Checksum calculation (the additional bytes added at the end of the data string to check the data integrity. Checksum Calculation varies from the simplest xOR to sophisticated CRC). Timing is also critical since some protocols require acknowledgment / response within milliseconds.

Designed to tackle all these problems, 232Analyzer (an advanced RS232 Protocol Analyzer) allows you to play with the protocol with all available data formats (ASCII, Hexadecimal, Decimal, Octal, and Binary). It also helps you verify the problem by monitoring the communications between two serial devices. As an example, 232Analyzer allows you to control and monitor (spy) serial port devices right from your PC. With 232Analyzer, even non-technical people can understand and play with the protocol within minutes.

Free Serial Port Sniffer

232Analyzer comes with two communication modes: Debugging / Simulating and Monitoring. Debugging / Simulating mode (in which it functions as a Terminal, Debugger / Simulator) provides an easy way to test your command codes, from which you can send / receive commands / signals to / from external serial devices. Monitoring mode (both Half-Duplex and Full-Duplex are supported) allows you to monitor (spy) on communications between any other two serial devices. Timestamps in milliseconds are provided in this mode. All data communications are recorded and can be saved as .txt, .rtf or .doc files. Besides all formats of data inputs (Hexadecimal, Decimal, Octal, Binary, and ASCII), 232Analyzer also allows you to change / monitor RS-232's line states: RTS, DTR, CTS, DSR, DCD, and RI.

232Analyzer comes with an advanced Checksum Calculator that allows you to do the following calculations: Bit wise Logic Calculation: AND, OR, XOR, NOT, Reverse Bit Order Math Calculation: +, -, x, , Mod CRC-16 (for Modbus) calculation.

232Analyzer also comes with many other advanced features for you to test / debug your serial devices:

• Programmable Buttons:
  Programmable Buttons allows you to store command strings and signal controls into a single button with delay, repeat and interval options. You can also chain different buttons together, so that when the first button's commands are completed, it will continue to send commands that are stored in the following buttons. Programmable buttons are very useful as some devices need to receive a series of commands in order to perform certain tasks, such as moving a camera's pan / tilt head. There are a total of 32 programmable buttons.
• Programmable Auto-Response:
  Programmable Auto-Response allows the program to respond to certain incoming data. For example, when the program receives an Enquiry Code: 5, it can respond with Acknowledgment Code: 6. In addition to the code response, the program can also respond to line changes. For example, when the line state changes to DSR ON (external device is ready for receiving data), the program can send out the preset commands. Programmable Auto-Response is a useful feature that allows the user to communicate with the controlled device more effectively and precisely, especially since some controlled devices require a response within a certain timeframe, e.g. 500ms. There are a total of 16 numbers of Auto-Response.
• Programmable Macros:
  Programmable Macros is an advanced feature which provides an easy way for simulation and automation. There are a total of 8 Macros, each consists of 8 steps and 8 sub-routines. Steps are the running sequence of each Macro. There are two options in the Step: Send Commands (and/or Signals) or running Sub-Routines.
  • Send commands (and/or Signals) allows you to send out commands and/or signals with the options of Delay, Repeat, and Interval. There are a total of 8 Steps in each macro.
  • Sub-Routine allows you to check the incoming data (and/or line state) or signal, then respond accordingly. Three conditions are checked: IF, ELSE IF and ELSE. There are a total of 8 Sub-Routines in each macro.

• Two communication modes: Debugging / Simulating and Monitoring (Half- or Full-Duplex)
• Send / Receive data in all formats: Hexadecimal, Decimal, Octal, Binary, and ASCII
• Timestamps in Monitoring mode
• Send / Receive signals: RTS, DTR, CTS, DSR, DCD and RI
• Customizable Color-coded Communication Logging Window
• COM 1 to 16
• Frequently Used Keys: 00h to 1Fh (a total of 32 numbers)
• Programmable Buttons: send command strings, signals or data sequence with the click of a single button (a total of 32 numbers)
• Programmable Auto-Response: Upon receiving certain data or signal, program automatically send out data, and/or signals (a total of 16 numbers)
• Programmable Macros: send sets of data / signals, response to different types of incoming data / signals with timer and sequence (a total of 8 x 8 Steps, and 8 x 8 Sub-routines)
• Virtual LEDs: View RS-232 line state, control RTS and DTR, Break communication if necessary
• Data Logging: All communications are logged and can be saved into .txt, .doc or .rtf file for future analysis
• Checksum Calculator: Logic, Math and CRC calculation
• Notation Converter: Convert data from one notation to another
• ASCII chart: All 256 ASCII code in different formats
• User Notes: User notes can be input
• Device Profile: Settings for different devices can be save individually
• Flexible screen adjustment
• User preferences settings: General, Startup Actions, Exit Actions, etc.

• Industry-proven
• Award-winning software product with thousands of satisfied customers
• More features than most of the hardware analyzers on the market
• Software price is only a fraction of the hardware analyzer's.
• Extremely easy to use, no programming knowledge required.
• Fast activation, no frustrated waiting time.

• Programmers
• Software developers
• Hardware engineers
• System integrators
• Lab experts
• IT specialists

• Serial hardware development
• Serial device driver development
• Serial protocol development, implementation, or reverse-engineering
• Software testing
• Hardware testing
• COM port testing
• External serial device control and monitoring
• etc.

• SCADA
• PLC
• Building Automation
• A/V Control
• Security Systems
• Communication Systems
• Other Industrial/Commercial Control and Automation Systems
• Other Systems or devices that use serial communications (RS-232 / 485 / 422)
• etc.