C50- PARALLEL PORT INTERFACE CARD Rev. 1 User ... - CNC4PC
C50- PARALLEL PORT INTERFACE CARD Rev. 1 User ... - CNC4PC
C50- PARALLEL PORT INTERFACE CARD Rev. 1 User ... - CNC4PC
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<strong>C50</strong> (<strong>Rev</strong>. 1) <strong>User</strong> ManualCalculating the R1 value.Note: Rx is the unknown resistor value.R X = V EX .(R/V) - R (1)Where:V EX is the external power supply voltageV is the voltage across the R resistorAn external resistor and a voltmeter are required to calculate the internal resistor (Rx)value.Note. The user should know the R value to do this operation. A 4.7KOhm @ 1/2W isrecommended.SAMPLE: if you are using a 12V power supply (V EX ), and using a 4.7KOhm asexternal resistor (R), then the voltage across R should be 6V, using the equation 1,the Rx value is 4.7KOhm.<strong>Rev</strong>ision: 4/16/2012 http://cnc4pc.com/TechDocs/<strong>C50</strong>R1_<strong>User</strong>_Manual.pdf 11/14
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