Xantrex Technology XTR 850 Watt - Manual (Page 80)

Local Operation
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3. Press the Rotary knob/Enter button to display SD 0 (shutdown on
logic 1) or SD1 (shutdown on logic 0).
4. Press the Rotary knob/Enter button to commit the desired polarity
setting.
For example: If you set the shutdown logic to 1 (SD1) and apply a
logic high (greater than 1.2 Vdc) to pin J3.12 relative to pin J3.6 on
the ISOL connector, the power supply will shut down. Conversely, if
you set the shutdown logic to 0 (SD0), the power supply will only
operate when you have a logic high (greater than 1.2 Vdc) to pin J3.2
relative to pin J3.6.
The SCPI command (s) for these instructions are:
[:]OUTPut[<channel>]:POLarity