When a user setpoint request for a DX9100 output point is processed, the device communication process must set the point value and a control bit. The control bit causes the output value to be held at the setpoint value and prevents the DX9100 internal programming from changing it. The hold may be manually released by clearing the control bit via a setpoint.

There are three types of control bits.

A supervisory control bit controls the first 8 binary outputs.

A control and status bit controls the first 8 analog outputs.

All other outputs are controlled by a hold control bit.

More information

	Supervisory control.
	Analog control and status.
	Hold control.
	About Johnson Controls N2 Bus Communications.

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