The Eltron Company P310 manual Serial and Parallel Port Circuitry

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CHAPTER 3

3.4.4 Serial and Parallel Port Circuitry

Figure 3-6 shows the Parallel and Serial Port circuitry. Note that a Serial Host Port is optional. When used, the Micro Controller supplies the Serial Port data signals. U18 is a receiver/transmitter that has a built-in charge pump for outputs that require ±10-volt swings. Note that U18 connects to two port connectors. For these printers, only the host connection is used.

Parallel Port circuits can support bi-directional flow, with 3-state receiver transmitter U37 used to receive or transmit data between J14 and registers U38 and U39. An exchange of handshake signals controls the flow of data.

The host indicates its desire to send data by activating SELECTIN/* and placing data on the J14-P0~7 lines. The printer acknowledges by preparing the printer for data reception and activating ACK/. The Micro Controller raises the R_W/ line and delivers a CS// pulse to begin the related data read. A BUSY activation results. These, in turn, inform the host that an activation of STROBE// will transfer the data into the data reception register of the printer.

Note that the R_W/ and CS/ signals combine to set the latch (cross-coupled gates) to activate BUSY and ACK/, and enable U38 (at OC). Also note that activation of STROBE/* clocks the data into U38 and, with CS/ inactive, resets the latch. Reception or transmission through U37 is controlled by the Micro Controller via data placed in U40 (signals DIR and CS 1).

If the printer senses an error, an encoded response is sent to the host over the PERROR and FAULT/ lines. Possible responses are OK, Command Error, Out of Media, and Mechanical Error. The Micro Controller loads associated data into U40 during a related Write Operation.

Write Operations begin with the a CS// pulse with the R_W/ line low. When sending data, U39 is clocked into U39 by an associated CSWrite/ pulse. Similar to data reception, data also written into U40 enables U37 and determines its flow direction. Note also that writes to U40 can activate BUSY and ACK/ if, for example, the Micro Controller needs to hold off host transfers.

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980264-001 Rev.B

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Contents P310 Maintenance Manual Page Technical Support Return Materials AuthorizationForeword Copyright NoticeFCC Notice TrademarksCSA Notice Table of Contents Troubleshooting Table of Figures Viii Chapter General Description Printer DescriptionOptions Major Elements Card FeederPrinter Cleaning RollerSmart Card Docking Option About this Manual Magnetic Stripe Encoder OptionChapter Preparing a STATIC-SAFE Work Area Packaging ConsiderationsEnvironmental and Shock Protection Installation and Operation Installation UnpackingTape and Packing Card Input Hopper Installation Card Input Cartridge InstallationCard Output Hopper Cleaning Roller Cartridge Preparation Cleaning Roller InstallationCleaning Roller Tape Removal Shows removal of the tape protecting the tacky surfaceLocation Concerns Attaching CablesUSB Concerns Parallel an Serial Cable Diagrams 10. Cable WiringControls and Indicators OperationPrint Head Release and Latch Levers 12. Print and Lamination Head Latch and Release Levers13. Ribbon Installation Ribbon LoadingCard Gate Adjustment 14. Card Gate AdjustmentLoading Card Input Hopper 15. Card Cartridge LoadingStarting the Cleaning Cycle 16. Cleaning Card InstallationChapter Theory of Operation Color FundamentalsChapter Chapter Chapter Region Black Body Temperature Chapter Printing Card Path Elements Card Path Elements Circuit Descriptions Printer Module Block Diagram Print Head Circuitry CTN Motor Control Circuitry SD0 Status Circuitry Efilm Serial and Parallel Port Circuitry EXT2 EXT3 USB Port Circuitry Optional USB Port CircuitryMagnetic Stripe Encoder Circuitry Option Magnetic Stripe Encoder ElementsSmart Card Circuitry Option Smart Card Circuitry 10. Operator Panel Circuitry Power Regulator Circuitry Operator Panel CircuitryChapter Troubleshooting Diagnosing Basic Printer Problems Problems Duplicated by a Test PrintAdjustment Replace Or Cleaning Ment Diagnosing Computer Interface Problems Interface Diagnostic FlowChapter Replacement Procedures Required Tools Item No Tool DescriptionPart Replacements Rear Case RemovalFront Case Removal Bottom Plate Removal Power Supply Replacement Bottom Plate and Power SupplyCard Feeder Part Removals Card Feeder RearPrint Head Replacement Print Head Upper FastenersPrint Head Ground Lug Print Head Assembly Removal Print Head Connectors 10. Properly Positioned Print Head 11. Fan Replacement Fan RemovalRibbon Sensor Removal 12. Ribbon Sensor RemovalFront Belt Removals 13. Front BeltsCPU and Encoder Board Replacements 14. CPU and Encoder BoardsRear Plate Removal 15. Rear Plate RemovalsDaughter Board Removal 16. Daughter BoardFlag and Head Latch Sensor Board Replacement 17. Flag and Head Latch Sensor BoardRear Belt and O-Ring Removal 18. Rear Belts and O-RingSmart Card Interface Board Replacement Option 19. Smart Card PWB20. Smart Card Solenoid Removal 21. Smart Card Docking Station Encoder Head Replacement 22. Encoder Station Shroud24. Encoder Station Pressure Roller Rod 25. Encoder Head Pinch Roller Removal 26. Pressure Roller Rod Removal Chapter 29. Middle Panel Parts Ribbon Supply Spindle and Clutch Replacements 30. Supply Spindle Assembly Ribbon Take Up Spindle Replacements 31. Ribbon Take Up Spindle Chapter Maintenance and Adjustments Cleaning Cleaning MaterialsCard Transport, Platen, and Cleaning Rollers Card Transport Rollers Cleaning the Print Head Print Head CleaningObtaining and Installing Firmware Updates AdjustmentsStepper Belt Tension Stepper Motor FastenersStepper Motor Belt Tensioning Fixture Part No Stepper Belt Tensioning Print Head Tilt Adjustments Head Alignment Test CardsImage Brightness Adjustment Lower Print Head Fasteners Print Head Peel Bar Position Adjustment 10. Peel Bar FastenersImage Centering Result RemedyValue Appendix a Test Software Appendix a Launching the Card Printer Test SoftwareAppendix a Changing the COM Port Operating in Terminal Mode Typical Sub List Sensor Test Selection Zebra Technologies Corporation