Measurement Computing PC104-DAC06 - Manual (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
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