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Model PMDX-120Parallel Port Accessory Module
The PMDX-120 has now transitioned to legacy product status. It is still possible to special order them but they are not recommended for new designs. OEMs and those needing replacements should contact us via email for price and availability quotations. The PMDX-126 is recommended to users seeking an replacement for the PMDX-120 in new designs.
Click on image for larger view The PMDX-120 is an accessory sub-system for small CNC machines using stepper motors or step-servos driven from the parallel printer port of a personal computer. It can be used with software such as MACH1, Master5, CNCPRO, EMC, TurboCNC, MaxNC (step/dir version), DANCAD, and probably many others. It is ideal for use with Gecko, Compumotor, or other motor drivers that accept step and direction inputs. It offers support for all pins of the parallel port and allows for isolation and protection of the parallel port on your computer. Dip switches provide settings for pinout selection, signal inversion, pulse conditioning, and debug/exercise modes. New version with alternate low voltage power input and 5VDC output. PMDX-120 Parallel Port Accessory Module FeaturesBreakout board feature comparison table. General:
PC Parallel Port:
Input Status Signals:
Relay Contact Outputs:
Motor Step/Direction:
Diagnostic Features:
Special Notes:
Note: The step and direction signals used to run this board as a real time CNC device require precise timing. These signals are normally provided by a personal computer motherboard with an onboard parallel port, a parallel port interface card plugged into a motherboard with ISA, PCI, or PCI-Express slots, or by an external device such as the SmoothStepper. You cannot use a USB to printer adapter because it will alter critical timing of CNC control signals. Documentation and Other Useful FilesDownload Manual in PDF format here (revision 1.6, 732 KB).
Board layout image with silk-screen legends
A good tutorial on parallel port interfacing can be found HERE |
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