Spectrum Brands MI.20xx - Manual (Page 83)

Option Extra I/O Analog Outputs
(c) Spectrum GmbH 83
Analog Outputs
In addition to the digital I/Os there are four analog outputs available. These outputs are directly programmed with the voltage values in mV.
As the analog outputs are driven by a 12 bit DAC, the output voltage can be set in a stepsize of 5 mV. The table below shows the registers,
you must write the desired levels too. If you read these outputs, the actual output level is given back from an internal software register.
After programming the levels of all analog outputs by the registers above, you have to update the analog outputs. This is done by the register
shown in the table below. To update all of the outputs all you need to do is write a “1“ to the dedicated register.
Programming example
The following example shows how to use either the digital I/O#s and the analog outputs.
Register Value Direction Description Offset range
SPC_XIO_ANALOGOUT0 47120 r/w Defines the output value for the analog output A0. ± 10000 mV in steps of 5 mV
SPC_XIO_ANALOGOUT1 47121 r/w Defines the output value for the analog output A1. ± 10000 mV in steps of 5 mV
SPC_XIO_ANALOGOUT2 47122 r/w Defines the output value for the analog output A2. ± 10000 mV in steps of 5 mV
SPC_XIO_ANALOGOUT3 47123 r/w Defines the output value for the analog output A3. ± 10000 mV in steps of 5 mV
Register Value Direction Description
SPC_XIO_WRITEDACS 47130 w All the analog outputs are simultaniously updated by the programmed levels if a “1“ is written.
// ----- output 8 bit on D7 to D0 and read 8 bit on D15 to D8 -----
SpcSetParam (hDrv, SPC_XIO_DIRECTION, XD_CH0_OUTPUT | XD_CH1_INPUT); // set directions of digital I/O transfer
SpcSetParam (hDrv, SPC_XIO_DIGITALIO, 0x00005A); // write data to D7-D0
SpcGetParam (hDrv, SPC_XIO_DIGITALIO, &lData); // read data and write values to lData
// ----- write some values to the analog channels. -----
SpcSetParam (hDrv, SPC_XIO_ANALOGOUT0, -2000); // -2000 mV = -2.0 V
SpcSetParam (hDrv, SPC_XIO_ANALOGOUT1, 0); // 0 mV = 0.0 V
SpcSetParam (hDrv, SPC_XIO_ANALOGOUT2, +3500); // 3500 mV = 3.5 V
SpcSetParam (hDrv, SPC_XIO_ANALOGOUT3, +10000); // 10000 mV = 10.0 V
SpcSetParam (hDrv, SPC_XIO_WRITEDACS, 1); // Write data simultaneously to DAC