User Manual
PD-1021 Hardware Manual (Rev. 1.00 / 2012-JUN-20) 15
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4 Reset to Factory Defaults
It is possible to reset the PD-1021 to factory default settings without establishing a communication link.
This might be helpful in case communication parameters of the preferred interface have been set to
unknown values or got accidentally lost.
For this procedure two pads on the bottom side of the board have to be shortened (see Figure 4.1).
Please perform the following steps:
1. Power supply off
2. Short two pads as marked in Figure 4.1
3. Power up board
4. Wait until the on-board green LED start flashing fast (this might take a while)
5. Power-off board (disconnect USB cable)
6. Remove short between pads
7. After switching on the power-supply all permanent settings have been restored to factory
defaults
Short these two pads
Figure 4.1 Reset to factory default settings
5 On-board LED
The board offers one LED in order to indicate board status. The function of the LED is dependent on the
firmware version. With standard TMCL firmware the green LED flashes slowly during operation.
When there is no valid firmware programmed into the board or during firmware update the green LED is
permanently on.
Green LED
Figure 5.1 On-board LED