Measurement-computing PC104-DAC06 Manuel d'utilisateur télécharger pdf (Page 9)

Table 3-2. Range Select Jumpers

Jump Pins Range

2-4, 3-5 +/-10V

2-4, 5-6 +/-5V

1-2, 3-5 0 to 10V

1-2, 5-6 0 to 5V

3.4 OUTPUT TRANSFER FUNCTIONS

To program a DAC, you must select the output you desire in volts, then apply a

transfer function to that value. The transfer function for CODE = output is:

The UNIPOLAR transfer function of the DAC is:

FSV / 4096 * CODE = OutV or CODE = OutV / FSV * 4096

For Example:

If the range is 0 to 5V and you desire a 2V output:

CODE = 2/5 * 4096 = 1638

The BIPOLAR transfer function for the DAC is:

FSV/4096 * CODE − .5 * FSV or CODE = (OutV + .5 * FSV) / FSV * 4096

For example:

If the range is set to ±10 and you desire a −7V output:

CODE = (−7V + .5 * 20) / 20 * 4096=614.

3.5 CABLING

Several cabling and screw termination options are available.

C40FF-2 2 foot (and longer) ribbon cable with 40-pin connectors.

CIO-MINI40 Simple, 40-position 4"X4" screw terminal board.

C40-37F-2 2 foot ribbon cable maps 40-pin to 37-pin D connector.

CIO-MINI37 Simple, 40-position 4"X4" screw terminal board.

CIO-TERMINAL Full featured 4"X16" screw terminal board with prototype

and interface circuitry.

3.6 SIGNAL CONNECTIONS

The analog outputs are two-wire hookups; a signal, labeled D/A # OUT on the

connector diagram below, and a Low Level Ground (LLGND). The low level ground

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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Measurement-computing PC104-DAC06 Manuel d'utilisateur Page 9