Part 2

428 Plug-In Assembly ConfigurationSetting the Output CircuitsAs noted, the counter output circuits are configured with jumpers J1 ,J2,J7 and J8.Figure 107 shows a simplified signal flow diagram for the counter output circuits.J7 selects either interrupt mode or pulse output mode, J7 selects positive true ornegative true logic and JI,J2 allow the internal pullup to be connected into thecircuit.With J8 in the NEG TRUE position, the output starts and stops in the high state.With J8 in the POS TRUE position, the output starts and stops in the low state. Theoutput for the interrupt mode (J7 in INTR position) is a level change for counteroverflow or measurement complete conditions. The output for the pulse output mode(J7 in PULSE position) is a square wave pulse train with frequency equal to half theinput frequency.OUTPUT CIRCUITS-SIGNALFLOWLEVEL CHANGEFROU COUNTERON MEASUREMENT 1COMPLETE OR OVERFLOW -J7 TO INTRI INTERRUPT UODE IJ1.JZ IN NON-ISOLATED POSITIONCONNECTS INTERNAL+5v PULLUPNEG TRUE7-r Jl"- OUTPUT HIOPTO-ISOLATORJ2-,POS TRUE 1 1 1OUTPUT LOORTO USER-EXTERNAL PULLUP REQUIRED WHEN J1.JZ.IN ISOLATED IOPENI POSITION.I PULSE OUTPUT MODE (JI,J2 IN NON-ISOLATED POSITIONCONNECTS INTERNAL'5V PULLUPL"JJ-mUOUTPUT HI' OPTO-CIRCUITISOLATOROUTPUT LOJ7TO PULSE- -POS TRUEFigure 107. Option 060 - Output Circuit Signal FlowInternal Versus External PullupA special consideration for the output circuits is whether to use the internal pullupor to use an external pullup. With J1 and J2 in the NONISOLATED position, the internalpullup is connected and supplies a 5 volt signal with 1.6 mA of current (maximum)to an external circuit.Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com