Part 2

Plug-In Assembly Configuration 429If your application requires a different logic level or more than 1.6 mA of current,you can set J1 and J2 to the ISOLATED position which removes the internal pullupfrom the circuit. However, you must supply a current source to the optoisolator onthe card. A sample connection is shown in Figure 108. Connect + to OUTPUT HIand - to OUTPUT LO for proper operation.J1,JZNON ISOLATEDISOLATOROUTPUT LO4 ~ =1.6mA (MAXIUSERCIRCUIT&COUNTER CARDJ1,JZISOLATED1 15v1 USER SUPPLIEDCURRENT SOURCEISOLATOROUTPUT HIUSER CIRCUITCOUNTER CARDIOPTIONALIFigure 108. Option 060 - Output Circuit Pullup ConfigurationsTo illustrate some ways that the counter can be configured, two examples follow.The first example uses an open collector input to produce a level change output formeasurement complete or overflow. The second example uses a square wave inputto produce a pulse train output. Although both examples show a square wave in-put, the counter can accurately handle a wide variety of inputs, including sine waves.For this example, a 5v square wave signal is to be input to the counterthrough an open collector NPN transistor. From Figure 105, limits for a 5vinput signal range are V(Hi) = 4.2~ minimum and V(Lo) = 1.0~ max foreither isolated or nonisolated input mode. Since the input meets thesecriteria, select nonisolated input mode by setting S1 to NONISOLATEDposition.Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com