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The four analog outputs can also be configured for unipolar (positive voltages only) or bipolar (both positive and
negative output voltages). In unipolar mode, the outputs range between 0-10V. In bipolar mode, the outputs range
between ±10V. Install the jumper for unipolar mode, as shown below. The default configuration is bipolar mode
(jumper out).
If the jumper is in, the outputs resets to the bottom of their range (zero-scale). If the jumper is out, the outputs
resets to the middle of their range (mid-scale). Normally, the D/A is configured to power up to 0V. When the
power is turned on, the device connected to the analog output does not see a step change in voltage. Therefore, for
unipolar mode, the outputs should normally be configured for zero-scale reset, and for bipolar mode the outputs
should be configured for mid-scale reset because 0V is halfway between -10V and +10V, for the ±10V range.
RS-485 Mode Selection (J18)
Jumper block J18 is used to select RS-485 mode for COM3/COM4.
Note 1. RS-485 mode needs to be set in the BIOS.
Note 2. Echo is enabled when RS-485 is set in half-duplex mode.
Diamond Systems Corporation
Figure 26: Analog Output Configuration Selection
Figure 27: J18 Jumper Block
Athena II User Manual
Page 38
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