RS232 serial spy monitor cable • • • • Introduction on monitoring serial RS232 data The RS232 standard defines an asynchronous way of communication between DTE, data terminal equipment (computers, printers, etc.) and DCE, data communication equipment (modems). This type of communication has become the minority and nowadays serial communications is mainly between two DTE devices using a. Although this is 1:1 communication, it is possible with special cables to monitor the data streams.

RS232 provides 2 data lines for each data channel. One is for transmitting data and the other for receiving. Because of these two separate lines, data can be send full duplex. This means that both ends can send and receive data simultaneously without mutual interference.

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Sniff data on serial ttyS0 by virtualbox COM. Added user to group for serial. Now: I am using sniffer on host; ie jpnevulator. Linux virtualbox serial-port. My dell dimension 8400 has a serial port on the back. I want to use minicom to interface the serial port on this computer with Ubuntu installed. How to find serial port. Ask Question 6. My dell dimension 8400 has a serial port on the back. I want to use minicom to interface the serial port on this computer with Ubuntu installed.

In most situations however the high level communication protocol only allows half duplex communications because most simple protocols with external devices work with a master-slave, or question-answer configuration. One of the parties is the master which is in charge of communications.

This master sends commands and requests to the slave which responds to them. The slave will never by itself start a communication sequence so in practise the communication is half duplex: There is no single moment when both sides send data simultaneously. That most RS232 communication is performed in a half duplex way is important if the data stream has to be monitored. A half duplex communication protocol can be spied with a computer with just one serial port attached. This port listens to both RS232 communication lines simultaneously but no data will be garbled because only one party sends at a time. This type of communication can be spied with simple software like the terminal emulation program HyperTerminal which is shipped with the Windows operating system. In the situation of full duplex communication on a RS232 channel we cannot simply tie both lines together and listen to it.

For this situation you need two separate serial ports on the spionage computer. Also special sniffer software is handy that listens to both ports simultaneously and outputs the data of both lines to the screen or to disk. Half duplex RS232 spy / monitor / sniffer cable It is not difficult to monitor half duplex RS232 serial communication between two devices with a PC. To do this you need the RS232 monitor cable which is displayed in the next picture. Two DB9 connectors are wired straight through. The spy computer is connected to the third connector. This monitor cable taps communication from two sources on only one RS232 receiver port.