Hi Juergen,
What voltage did you measure on AOUT2? Have you confirmed continuity to the AOUT2 pin and from AISEN through the resistor to GND?
When AOUT1 goes high, AOUT2 should go low if the AOUT2 pin. If it does not, there is usually a connection problem or the device may be damaged.
You can also try sending 0x003d. This should cause AOUT1 to be 0V and AOUT2 to be 12V.
What voltage did you measure on AOUT2? Have you confirmed continuity to the AOUT2 pin and from AISEN through the resistor to GND?
When AOUT1 goes high, AOUT2 should go low if the AOUT2 pin. If it does not, there is usually a connection problem or the device may be damaged.
You can also try sending 0x003d. This should cause AOUT1 to be 0V and AOUT2 to be 12V.