Datasheet

PD20-1-1210 Hardware Manual • Hardware Version V1.10 | Document Revision V1.20 • 2019-APR-03

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5 On-Board LED

The board oﬀers one LED in order to indicate board status. The function of this LED dependends on the

ﬁrmware version. With standard TMCL ﬁrmware the green LED should be ﬂashing slowly during operation.

When there is no valid ﬁrmware programmed into the board or during ﬁrmware update the green LED will

be permanently switched on. During reset to factory default values the green LED will be ﬂashing fast.

GREEN LED

Figure 3: PD20-1-1210 LED

6 Reset to Factory Defaults

It is possible to reset all settings in ﬁrmware for the PD20-1-1210 to factory defaults without establishing

a working communication connection. This might be helpful in case communication parameters of the

preferred interface have been set to unknown values or got lost.

For this procedure two pads on the bottom side of the module (electronics) have to be shorted (electrically

connected with each other) during power-on.

Please perform the following steps:

1. Switch power supply OFF (and disconnect USB cable if applicable)

2. Short CLK and DIO pads of programming pads on bottom of pcb (see ﬁgure 4)

3. Switch power supply ON again (or connect USB again if applicable)

4. Wait until the on-board red and green LEDs start ﬂashing fast (this might take a while)

5. Switch power supply OFF again (and disconnect USB cable if applicable)

6. Remove short between pads

After switching power supply ON again (and / or connecting USB cable) all permanent settings have

been restored to factroy defaults

Figure 4: Reset to factory default settings

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