Feb 15, 2013 - Ubuntu 12.04LTS and later is default equipped with the Silabs drivers! Connect the PC via an USB cable to the USB UART port of the Xilinx. Slsnif is a serial line sniffer software. It listens to the specified serial port and writes all data coming through it into either stdout (default) or a log file (if specified -- see option -l ). Slsnif operates either by creating a pseudo tty (pty) and linking it to the serial port, or by linking two serial ports together.

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. 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. This means that if the two devices happen to talk simultaneously, the monitored information will be garbage.

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In most circumstances communication protocols work half duplex, in which case this RS232 cable will work without problems. Otherwise you need the full duplex RS232 monitor cable which is discussed here also. Half duplex RS232 spy / monitor / sniffer cable Connector 1 Connector 2 Spy Function 1 1 - Carrier detect 2 2 2 via R 1 Rx Rx spy 3 3 2 via D 1 Tx Rx spy 4 4 - Data terminal ready 5 5 5 Signal ground 6 6 - Data set ready 7 7 - Request to send 8 8 - Clear to send 9 9 - Ring indicator - - 1 + 4 + 6 DTR CD + DSR - - 7 + 8 RTS CTS The electronic diagram looks simple and strange at the same time with one diode and one resistor. The functionality is however straight forward. The spy computer is attached to the connector in the right bottom. The female connector at the left is attached to the spied computer and the male connector at the right to the attached device. When an RS232 port is in an, it will be in the so-called marking state with a negative voltage at the transmit output.