Open Access v4 Jumpers: Difference between revisions
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[[File:AC400_1024x1024_jumpers.png]] | [[File:AC400_1024x1024_jumpers.png]] | ||
The Open Access comes ready to run out of the box | The Open Access comes ready to run out of the box, advanced users may want to customize their hardware. The following is a list of hardware features that can be selected via jumpers. | ||
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Latest revision as of 14:41, 11 May 2014
Hardware Settings and Defaults
The Open Access comes ready to run out of the box, advanced users may want to customize their hardware. The following is a list of hardware features that can be selected via jumpers.
Jumper Table
- 1 USB Power - Enable this jumper to allow the board to be powerd via USB or power an attached accessory.
- Default: ON
- Recommend turning this off if you need to ensure that your external device does not remain powered by the OA's 5V USB connection.
- 2 USB/RPi Selector - Determines whether the Open Access communicates via the mini-USB port or the Raspberry Pi connector
- Default: Both jumpers UP (USB)
- Set both jumpers in the pair to "USB" (top) setting to connect the serial output to the FTDI-based USB port.
- Important: Move both jumpers for proper operation. One jumper is for TX and one is for RX to the Atmgea328P.
- 3 RS-485 Termination - Enables a termination resistor for end-of-bus on an RS-485 circuit
- Default: ON
- Recommendation: Leave this to ON if connecting 0-1 devices, or if it is the last unit in the circuit.
- 4 Reset Enable - Can be used to disable the resetting and re-flashing of the Open Access CPU
- Default: ON (Reset enabled)
- Recommendation: Set this to OFF for increased security; setting it to OFF will prevent a reset and bootloader access. Set to OFF if a USB-attached peripheral may hard-reset and interfere with operation of the unit. Set to ON to allow programming/reset from USB.