Serial Tap

Key Features

• Designed for use with IO Ninja software (http://ioninja.com/).
• Monitors TX, RX, RTS, CTS, DTR, and DSR lines of serial ports.
• All inputs are connected to an 18-position, quick-release terminal block.
• RS232, RS485, and UART (TTL) modes, selectable via a slide switch:
• RS232 mode:
  • Two onboard DB9 connectors offer true "cable wedge" sniffing;
  • Six jumpers for swapping and loopbacking signals;
  • Six bi-color LEDs indicate the status of monitored RS232 lines;
  • DB9 connectors additionally pass through DCD and RI signals.
• RS485 mode allows to monitor TX and RX signal pairs.
• UART (TTL) mode allows to monitor UARTs of IC chips (1.8-5V logic).
• Six yellow LEDs indicate the state of six monitored lines.
• Full-speed (12Mbps) USB2.0 interface on a USB-C connector.
• USB-powered, no additional external power necessary.
• Supplied with a USB-C cable and two DB9 gender changers.
• Compact, outside dimensions only 82 x 74 x 30 mm.

Wedge RS232 Monitoring

The Serial Tap allows you to insert (wedge) it in between two RS232 devices. Here is how this is done.

Let's suppose that two serial devices are interconnected by a serial cable. Let's also suppose that the first device has a DB9-F connector, while the second device has a DB9-M connector. The serial cable is, therefore, of the M-to-F type.

To wedge the Serial Tap between these two devices, you will need the second M-to-F cable:

The Serial Tap has an additional useful feature allowing you to swap and loopback the signals in TX/RX, RTS/CTS, and DTR/DSR signal pairs. To achieve this, two jumpers are provided for each of the three pairs. There are three standard jumper configurations:

• Normal — In this position, the lines are arranged in such a way that wedging the Tap between the serial devices does not change anything. Meaning, TX on one end goes to RX on another end, and vice versa.
• Swapped — This swaps signals in a pair. Meaning, TX goes to TX, and RX goes to RX.
• Loopbacked — Both serial devices "receive back" their own signals. Meaning, the TX line on each side "comes back" through the RX line.

The following diagram illustrates the jumper arrangements. The diagram shows the jumpers for the TX and RX signal pair. RTS/CTS and DTR/DSR jumpers work in the same way:

Key Features

• USB-powered, no additional external power necessary;
• Supplied with a USB-C cable and two DB9 gender changers;
• Three operating modes: RS232, RS485, and TTL-level UART;
• Quick-release terminal block facilitates convenient wiring;
• Monitoring of TX, RX, RTS, CTS, DTR, and DSR lines;
• Onboard LEDs for line status indication;
• "Wedge" monitoring of RS232 communications:
  • DB9 connectors for placing the Tap "between" RS232 devices;
  • Jumpers for swapping and loopbacking RS232 signals within TX/RX, RTS/CTS, and DTR/DSR signal pairs;
  • Bi-color LEDs for distinguishing between positive, negative, and zero voltage levels on RS232 lines.

Hardware Specifications

Usage

Open the Serial Tap plugin in IO Ninja and select a tap device connected over a USB cable. Then you specify the the baudrate at which the communication to be sniffed works. After that hit the Capture button and you shall see all the communications (including data, control line changes and status line changes) from the DTE point of view.

Note, that you can adjust the serial parameters at any time and flip the DTE/DCE roles without re-wiring, simply by adjusting the Flip DTE/DCE setting.

Remote Capturing

Starting with IO Ninja v5.1.0, it is possible to capture data with a Serial Tap device remotely. For more information, please navigate to the Serial Tap over SSH plugin page.

Documentation