beaglebone-black - Flipbook - Page 77
BeagleBone Black
7.5 Serial Header
Each board has a debug serial interface that can be accessed by using a special serial cable that is plugged
into the serial header as shown in Figure 54 below.
Fig. 7.5: Serial Debug Header
Two signals are provided, TX and RX on this connector. The levels on these signals are 3.3V. In order to access
these signals, a FTDI USB to Serial cable is recommended as shown in Figure 55 below.
Fig. 7.6: PRU-ICSS Block Diagram
The cable can be purchased from several di昀昀erent places and must be the 3.3V version TTL-232R-3V3. Information on the cable itself can be found direct from FTDI at: pdf
Pin 1 of the cable is the black wire. That must align with the pin 1 on the board which is designated by the
white dot next to the connector on the board.
Refer to the support WIKI http://elinux.org/BeagleBoneBlack for more sources of this cable and other options
that will work.
Table is the pinout of the connector as re昀氀ected in the schematic. It is the same as the FTDI cable which can
be found at https://ftdichip.com/wp-content/uploads/2020/07/DS_USB_RS232_CABLES.pdf with the exception
that only three pins are used on the board. The pin numbers are de昀椀ned in Table 14. The signals are from the
perspective of the board.
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Chapter 7. Connectors
