Delta Tau PMAC2A-PC/104 - Manual (Page 34)

PMAC2A PC104 Hardware Reference Manual
Software Setup 28
Analog Inputs Setup
The optional analog-to-digital converter inputs are ordered either through Option-12 on the baseboard or
Option-2 on the axes expansion board. Each option provides two 12-bit analog inputs with a ±10Vdc range.
The M-variables associated with these inputs provided a range of values between +2048 and –2048 for the
respective ±10Vdc input range. The following is the software procedure to setup and read these ports.
Baseboard Analog Inputs
I903 = 1746 ;Set ADC clock frequency at 4.9152 MHz
WX:$C014, $1FFFFF ;Clock strobe set for bipolar inputs
M105->X:$0710,12,12,S ;ADCIN_1 on JMACH1 connector pin 45
M205->X:$0711,12,12,S ;ADCIN_2 on JMACH1 connector pin 46
Acc-1P Analog Inputs
I907 = 1746 ;Set ADC clock frequency at 4.9152 MHz
WX:$C034, $1FFFFF ;Clock strobe set for bipolar inputs
M305->X:$0714,12,12,S ;ADCIN_1 on JMACH1 connector (Acc-1P) pin 45
M405->X:$0715,12,12,S ;ADCIN_2 on JMACH1 connector (Acc-1P) pin 46