Hi Amara, If you want to control the signal through your Arduino, then leave the jumper open. If you are not controlling the signal through the Arduino, then you should close the jumper to ground the signal or leave it open, so the signal is pulled up to IOVDD. You'll need ENABLE and LDAC connected to ground, and RST connected to IOVDD for normal operation. The SPI data you are sending looks correct to load all DAC channels with the data you stored in the temporary registers for each channel. If you haven't previously written any data to the temporary registers, then the outputs will remain at 0V. You can try writing 0x348000. Best, Katlynne Jones
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