PMDX-121 Economy Break-Out Board User`s Manual
Contents
1. USB Connector used for power only Table 1 Summary of PMDX 121 Connectors 2 1 Stepper Motor Connector J1 J2 J3 and J4 Connectors J1 through J4 contain buffered versions of the PC parallel port data bus signals which are normally used as stepper motor step and direction outputs The PMDX 121 buffers each of these signals Depending on the setting of jumper JP2 the buffer may have its outputs tri stated See section 3 2 Step Direction Output Enable for more information PMDX 121_Manual_14 doc 7 September 2004 2004 Practical Micro D esign Inc All Rights Reserved Page 4 of 16 PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above W hen the step and direction outputs are disabled by E Stop or charge pump failure the PMDX 121 provides a 10K ohm resistor between each step and direction signal and the S D COM signal This provides a known logic state when the output buffers are disabled The PMDX 121 does not define which signal is step and which is direction In fact the PMDX 121 allows these signals to be used for any purpose Their function depends on the software used to generate the signals on the PC The output connectors are labeled to denote which pin on the PC s parallel port that is associated with each connector pin Pin Number Label Description __ O S O Pin 2 Buffered signal from pin 2 of the PC parallel2. pump is O K and enables the output buffers W hen the signal stops toggling the PM DX 121 disables the output buffers This charge pump circuit is designed to work with the Mach2 CNC software However any software that can toggle pin 17 on the PC parallel port can make use of this feature If your software does not support this feature configure the jumpers to disable the charge pump circuit Jumper JP3 determines whether the output from the charge pump is used to enable and disable the output buffers See section 3 3 for more information Furthermore jumper JP2 determines whether the step and direction outputs are ever disabled See section 3 2 for more information NOTE The state of the charge pump signal is not reflected in the E Stop and Fault status that is output on the Ack signal to the PC pin 10 on the parallel port This is to prevent lock up of the software Mach2 requires that the Emergency Stop signal Ack not be asserted before it will start generating the charge pump signal 7 0 LEDs The PMD X 121 provides LEDs to show the state of many of the status and control signals These LEDs are described in the following sections 7 1 Outputs Enabled LED DS1 The O utputs Enabled LED is located near the center of the circuit board just above the serial number block and is labeled O utputs Enabled when lit This LED in on when the control output buffers are enabled Also
3. 0 Overview This document describes the configuration and operation of the PMD X 121 Break O ut Board The PMDX 121 provides an interface between a PC and a multi axis stepper motor system This document pertains to the following versions of the PMD X 121 Circuit Board Revision PCB 440B marked on the bottom of the board 1 1 Important Safety Information The PMDX 121 is intended for integration by the purchaser into industrial control systems It is solely the purchaser s responsibility to assure that the system is configured in a manner consistent with applicable safety requirements Practical Micro Design Inc does not control how this board is integrated into the purchaser s system and cannot be responsible for guaranteeing the safety of your system The PMDX 121 is not guaranteed to be fail safe The system into which the PMD X 121 is installed should provide fail safe protection and emergency stop capability The PMDX 121 contains circuitry that may be connected to dangerous voltages Care must be taken that user cannot come in contact with these voltages An enclosure that allows for modest ventilation but prevents intrusion by operator s hands and foreign objects especially conductive byproducts of machining operations should be utilized with this board Interlock switches on power circuits should remove power when the enclosure is opened Automated machine tools into which the PMDX 121 may be integrated can cause injury Precau
4. APA ee ee ee ee 8 2T lt Power Supply JII cascades tein tain enn eet AAA AN ict NA eae tt acta 10 2 8 USB COMETON PA AA AA PA PA 10 CARS 0 gt ee 10 Jil SD COMMON PD Kng annainn a haa an 11 3 2 Step Direction O utput Enable P2 si atustnincateiainainiancabantaiaaaianinlentahvdueilabatniend 11 3 3 O utputs Enabled Selection JPI waciav iatantancrtantahainiancatantaiwaaian inten aana hima bana 11 3 4 Pin 17 O utp t Source PAY nuesa iai 12 4 0 E Stop Input ae 12 5 0 Fault Inout esesssssesssseeessensennsneeeenseneeneeoesoeneeneeoesoesouneuaeuaesoeneuaeeaeeaesoeneuaeeaesoessuneuaeeaesaesseenaesoesey 13 6 0 Charge Pump watchdog aaa B FAQs WEDS ABA B 7 1 Outp ts E abled LED DS aNG GAGA BANANA NGABA 13 dab SATUS Input DEDS aNG ANA ANA 14 AB Relay State LED GANG GA ANGKAN AND 14 LAs SControlQwtput LED Sirian AAA NANANA NANANA NAN NANANA 14 Mas SEMO LED NCD SI Oy tiina ANAN ANAN AA NA ANAN NANANA ANAN cle 14 Mechanical Specifications AA AA 15 9 0 Electrical and Environmental SpecificationS s s ssssssususununununununnnnnnnnnnnnnnnnunnnunnnennnnnnn nnna 15 Appendix A W arranty umuna naawa nnn2N NON NAA NAAN NAN NON NAANAKN NON NAA NAANAA NAA NOANNAA NANANA ALAALA NANANA AA 16 PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 2 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above 1
5. able to provide more than 100mA Status Inputs Min input high 2 0V referenced to the Gnd terminal Max input low 0 8V referenced to the Gnd terminal Control O utputs Min output high 3 7V referenced to the Gnd terminal sourcing up to 16 mA per output Max output low 0 4V referenced to the Gnd terminal sinking up to 16 mA per output Environmental Temperature 0 to 55 C Relative H umidity 20 to 80 relative humidity non condensing PMDX 121_Manual_14 doc 2004 Practical Micro Design Inc Page 15 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above Appendix A Warranty Statement Practical Micro Design Inc PMD warrants that this hardware product is in good working condition according to its specifications at the time of shipment for a period of 90 days from the date it was shipped from PMD Should the product in PMD s opinion malfunction within the warranty period PMD will repair or replace the product without charge Any replaced parts become the property of PMD This warranty does not apply to the software component of a product or to a product which has been damaged due to accident misuse abuse improper installation usage not in accordance with product specifications and instructions natural or personal disaster or unauthorized alterations repairs or m
6. depending on the settings of jumpers JP2 the step and direction outputs are enabled when this LED is on see section 3 2 for more information PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 13 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above The O utputs Enabled LED is on when all of the following conditions are met e The E Stop input is driven low see section 4 0 e The Fault input is driven or allowed to float high see section 5 0 e optionally the charge pump circuit is OK depends on the setting of JP3 see section 3 3 7 2 Status Input LEDs The Status Input LEDs are located next to connector J5 just above each of the pin number labels pin 11 pin 12 etc Each LED is on when the corresponding input signal is driven low 7 3 Relay State LED The Relay State LED is located between the relay and connector J7 and is labeled pin 1 outputs since it is driven by the Strobe signal which is pin 1 on the PC s parallel port The LED is on when the relay is energized See section 2 4 for more information 7 4 Control Output LEDs The Control O utput LEDs are located next to connector J8 just above each of the pin number labels pin 14 pin 16 and pin 17 Each LED is on when the corr
7. port s 25 pin D connector o UT parallel port signal name D 0 Te Buffered signal from pin 3 of the PC parallel port s 25 pin D connector OUT parallel port signal name D 1 COM see section 3 1 for reference source Table 2 Stepper Motor Connector Pin Out J1 aaa Pin 4 Buffered signal from pin 4 of the PC parallel port s 25 pin D connector OUT parallel port signal name D 2 Pin 5 rare signal from pin 5 of the PC parallel port s 25 pin D connector OUT parallel port signal name D 3 S D Step amp Direction common voltage reference same for all four connectors COM see section 3 1 for reference source Table 3 Stepper Motor Connector Pin Out J2 Pin Number Label Description Cd Buffered signal from pin 6 of the PC parallel port s 25 pin D connector OUT parallel port signal name D 4 Buffered signal from pin 7 of the PC parallel port s 25 pin D connector OUT parallel port signal name D5 COM see section 3 1 for reference source Table 4 Stepper Motor Connector Pin Out J3 Pin Number Label Description _ O S O Pin 8 Buffered signal from pin 8 of the PC parallel port s 25 pin D connector o UT parallel port signal name D 6 hik Buffered signal from pin 9 of the PC parallel port s 25 pin D connector OUT parallel port signal name D 7 COM see section 3 1 for reference source Table 5 Stepper Moto
8. reference voltage appears on all four connectors See section 2 1 for more information on the step and direction output connectors Jumper JP1 labeled S D Common on the circuit board determines this voltage reference as shown in the following table Setting Label Description _ o Supplies 5V to the common terminals This configuration is commonly used when Ito 15V the motor drivers have optically isolated inputs and expect a pull down or open collector drive signal In this case the PMD X 121 supplies the 5V power to the opto couplers See also the note below Connects ground to the common terminals This setting would typically be used 2 to 3 GND with motor drivers that have non isolated TTL logic style inputs but also has enough drive for most opto couplers Table 12 Step Direction Common Jumper Settings JP1 NOTE Changing the common reference from 5V to Gnd via jumper JP1 when feeding optically isolated driver inputs will have the effect of inverting the step and direction signals WARNING W hen connecting to non isolated motor driver inputs do not connect the PMD X 121 s 5V reference to ground on the motor driver module Doing so may damage the buffer on the PMD X 121 the inputs to the motor driver and possibly the PC s parallel port 3 2 Step Direction Output Enable JP2 The PMD X 121 allows the E Stop Fault and charge pump circuits
9. to disable the step and direction output signals Jumper JP2 along with JP3 determine if and when the step and direction outputs will be disabled Jumper JP2 is labeled S D Enable on the circuit board Refer to section 2 1 Stepper M otor Connector for information on the behavior of the step and direction outputs when they are disabled Setting Label Description _ o The step and direction outputs are always enabled i e ignore the E Stop Fault and charge pump circuits Step and direction outputs are enabled as long as the O utputs Enabled LED is 2t03 CP OK on Note that this setting not only pertains to the charge pump the CP in CP O K but also to the emergency stop and fault inputs See sections 3 3 Outputs Enabled Selection and 7 1 Outputs Enabled LED for more information Table 13 Step Direction Output Enable Jumper Settings JP2 3 3 Outputs Enabled Selection JP3 Jumper JP3 is labeled O utputs Enabled and selects whether or not the charge pump circuit can disable the output buffers as well as when the O utputs enabled when lit LED in on PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 11 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above Setting Label Description o not Estop O utputs are enabled and LED is on w
10. 594 and above The following web sites provide information regarding the PC s parallel port including pin o uts signal names and useful data for software control of the parallel port e BM PC Parallel Port FAQ and tutorial http www pmdx co m Resources parallel port htmI and http et nmsu edu etti fall96 co mputer printer printer htmi e General information and lots of links http www lvr com parport htm e If the previous links do not work go to http www pmdx com our main web page click on the PMD X 120 link then look for the links to parallel port information pages N ote that these web links were accurate as of the printing date of this manual W hile we expect that these two sites will remain available at these addresses it is possible that they will move or disappear 2 7 Power Supply J11 Connector J11 is used to provide 7 to 12 VDC or 6 to 9 VAC power to the PMDX 121 This connector is a standard 2 1mm diameter coaxial power connector that is compatible with many wall mounted power packs WARNING When usingJ11 make sure that no power source is connected to J8 pin 5 Aux Power In See section 2 5 for more information Also the USB connector should not be connected though no damage should occur Pin Description o Positive voltage or AC voltage Table 11 Power Supply Connector Pin Out J11 2 8 USB Connector J12 The USB connector can be used as an alternate power source for the PMDX 121 T
11. PMDX 121 Break O ut Board User s Manual Document Revision 1 4 Date 7 September 2004 PCB Revision PCB 440B Serial Number 22594 and above PMDX W eb http www pmdx com 7432 Alban Station Blvd A105 Phone 1 703 912 4991 Springfield VA 22150 2321 USA FAX 1 703 912 5849 PMDX 121 Manual 14 doc 2004 Practical Micro Design Inc Page 1 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above Table of Contents LO OVEN WOW EE E E A E A PE A E E 3 1 1 Important Safety Information sssssssissssssrrssssssrrrsssssnrrssrsssnnnnrnsnnnnrisnnnnnrssnnnnn nnsa aaa 3 t Warranty Summaan aaan Aaaa 3 1 3 Feature Snan setieint anda india tindiahatiadaliainiatadiativalaniaiatenndehediaurdnaniaiatanniuiats 4 1 4 Updates to this MaNUahiaaaanaanakanakainhanaaanakanpinal bunakanakalimbalippbanakabahahphn 4 2 0 Connectors Xuan 4 2 1 Stepper Motor Connector J1 J2 J3 and J4 ummm anananaananasanasanaasaanasanassanasaaasaanasaasasaassasnssaaasssanssasssss 4 2 2 SEACUSIMOUE COMMECEO n5 iranerne annan ain A S shige Aa Ena adis 6 2 3 Fault and E Stop Connector JB cssccsssscsssscsssssssssssssssuscssuscssvsssssscssssssssessssesssssssssessssssssessesesssnsessusessneesseeessses 6 2 4 Relay Contact Connector 7 NA NANANA aa aa a 6 2 5 Control Output Connector B esses sana ae Rg 7 2 6 PE Paralel Porti Oh snes ANNA NA NANANA NANANA
12. ay with N O and N C terminals e LED indicator for relay state General Purpose O utputs e 3 each general purpose digital outputs PCB Revision PC B 440B Serial N umber 22594 and above Power Supply Input e 7to 12 VDC or6 to 9 VAC input via 2 1mm coaxial jack e Or 5V via USB connector e Or alternate 7 to 12 VDC or6 to 9 VAC input via J8 screw terminal connector Motor Step D irection e 4 axes of step and direction e Step and direction signals are buffered e Can supply 5V to motor driver opto couplers Special Features e Wire clamp screw terminals for all connections to motor drivers relay and control outputs and status inputs e Auxiliary 5 volt supply output e Outputs are buffered e LED indicator for each output 1 4 Updates to this Manual Check the PMDX web site for revisions or updates to this manual http www pmdx com The latest revision of this manual is available on the PMD X 121 page follow the links from the main page 2 0 Connectors The PMD X 121 contains the following connectors Refer to the following sections for details on the pin outs for each connector For all connectors pin 1 is the pin closest to the reference designator i e J1 pin 1 is the pin closest to the J1 text on the circuit board In addition all connectors have square pads on pin 1 look on the bottom of the circuit board EEn step and Drecon 9p J5 Status Input Signals J8 Control 0 vue
13. depending on the setting of jumper JP4 see section 3 4 PWR Altin Alternate power input terminal 6 GND Groundconnection Table 9 Control Output Connector Pin Out J8 NOTE Due to logic inside the PC some control outputs are inverted This means that that writing a 1 to a bit in the control register may result in a logic low at the 25 pin D connector Please refer to technical documentation on the PC parallel port or your control software for more information 2 6 PC Parallel Port J10 The PMDX 121 provides a Centronics style connector for connections to a PC s parallel port This allows the use of a standard PC printer cable NOTE Some printer cables do not have good signal shielding Some cables also omit some of the status or control signals Such as Auto Feed and Select O ut 25 pin D connector pin numbers 14 and 13 respectively W e recommend using cables that are listed as IEEE 1284 compliant PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 8 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above ne Numbers Direct ection BEAN 1 note3 Name to PC Signal Comment Raba Rela Ka ized wilo ic high at the st ee 4 Data out Step Dir input Step and direction signals are Step Dir input buffered and then connected to the 6 6 7 Step Dir
14. e refer to technical documentation on the PC parallel port or your control software for more information 2 3 Fault and E Stop Connector J6 J6 provides the Fault and E Stop input signals to the PMDX 121 Refer to sections 4 0 E Stop Input and 5 0 Fault Input for more information on using these signals Pin Number Label Description fa Fault input active low i e ground to signal a fault Emergency Stop input active high i e open to signal E Stop You must provide a ground via the E Stop switch chain or a direct jumper in order to enable the outputs on the PMD X 121 board Table 7 E Stop and Fault Connector Pin Out J6 2 4 Relay Contact Connector J7 The PMD X 121 uses the PC parallel port control signal Strobe pin 1 on the PC s 25 pin D connector to control the on board relay The relay provides both a normally open and a normally closed connection There is an LED near J7 to indicate the relay status This LED is on when the relay is energized The relay will be forced to the de energized state regardless of the state of the Strobe signal under the following circumstances e The E Stop signal in asserted see section 4 0 E Stop Input e The Fault signal is asserted see section 5 0 Fault Input e or optionally depending on the setting of jumper when the charge pump JP3 a failure in the charge pump circuit see s
15. ection 3 3 for information on the jumper setting and section 6 0 for information on the charge pump PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 6 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above Pin Numker Label Description CC N ormally O pen relay contact i e open when relay is not energized RLY Relay common terminal COM y N ormally Closed relay contact i e closed when relay is not energized Table 8 Relay Contact Output Connector Pin O ut J7 NOTE Due to logic inside the PC the Stobe control output is inverted This means that writing a 1 to a bit in the control register results in a logic low at the 25 pin D connector In order to energize the relay a 0 must be written to the parallel port control register Please refer to technical documentation on the PC parallel port or your control software for more information 2 5 Control Output Connector J8 The PMD X 121 supports three general purpose control outputs as shown in Table 9 below The fourth PC parallel port control signal Strobe is dedicated to the PMD X 121 s on board relay see section 2 4 The control outputs are buffered and each output has an LED that in on when the output signal is driven high The control output on pin 4 labeled Pin 17 can be driven by one of two sources ba
16. esponding output signal is driven high 7 5 Error LED DS10 The Error LED is located next to connector J6 and is labeled error when lit The LED indicates the state of the Ack signal to the PC and is on to indicate an error condition Error conditions are caused by either the Fault input or the E Stop inputs See sections 4 0 E Stop Input and 5 0 Fault Input for more information on these signals PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 14 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above 8 0 Mechanical Specifications 4 500 ma 0 175 2 650 n0006 4 each 0 150 dia holes for 6 screw Ba Ha A Figure 1 PMDX 121 Dimensions and Mounting Holes WARNING The PMDX 121 should be protected from liquids dirt or chips especially metal chips which can cause shorts coming in contact with the board 9 0 Electrical and Environmental Specifications Main Power 7 to 12 VDC or 6 to 9 VAC input 200 mA maximum USB Power 5V DC 200 mA maximum optional power source as alternate to main DC power Note 100mA is the USB standard current limit provided to un initialized USB devices by a USB hub Therefore you should only connect the PMD X 121 to self powered hubs or directly to a PC s USB port Bus powered USB hubs may not be
17. he PMDX 121 draws a maximum of 200mA from this connector See section 9 0 Electrical and Environmental Specifications for information regarding U SB hub requirements W hen using the USB as a power source there should not be any power source connected to J11 or to J8 pin 5 The PMDX 121 has series diode protection on the USB power supply lines so no damage to the USB host or the PMD X 121 should occur if another power source is connected along with the USB It is better to avoid this situation in the first place however NOTE The PMDX 121 is nota USB device It does not send or receive data or control information to the PC There are no device drivers that need to be installed on the PC The PMDX 121 uses the USB connector solely as an alternate power source 3 0 Jumpers The PMDX 121 contains four 3 pin jumpers that determine various aspects of its behavior Each jumper has silk screen labels that describe the function of the jumper and each possible setting Each jumper should have a shorting block installed either between pins 1 and 2 or between pins 2 and 3 PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 10 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above 3 1 S D Common JP1 The step and direction connectors provide a common voltage reference for all four step and direction output connectors i e the same
18. hen the E Stop and Fault signals are NOT asserted the charge pump circuit is ignored CP OK and O utputs are enabled and LED is on when the charge pump circuit is OK i e the charge pump circuit is enabled and the E Stop and Fault signals are NOT not EStop asserted 2to 3 Table 14 O utputs Enabled Jumper Settings JP3 3 4 Pin 17 Output Source JP4 Jumper JP4 is labeled pin 17 out and selects which circuits are driven by pin 17 on the PC parallel port Select In Setting Label Description _ S Ito jarma Pin 17 from the PC parallel port drives the pin 17 control output as well as the charge pump circuitry Pin 17 from the PC parallel port drives only the charge pump circuitry The pin 2 to 3 CP OK 17 control output is driven high or floats low based on the state of the E Stop and Fault inputs and the charge pump circuit See section 2 5 for more information Table 15 Outputs Enabled Jumper Settings JP3 4 0 E Stop Input The E Stop input provides an interface for external emergency stop circuits This signal is active high meaning that a logic high tells the system to stop and a logic low means all is O K The E Stop input is designed to be connected to an external normally closed switch or group of switches all wired in series The external switch es should be wired between the E Stop pin and ground such that the switch c
19. input PMDX 121 s step amp direction output connectors see section 2 1 7 Data 5 out Step Dir input 8 Data6 out Step Dir input 19 9 Data7 out Step Dir input Polo a a pamana pa opa pe Ps fasten Do a PRES a koa ala ea kam o es ao Select In note 2 amp 4 Control O utput Centronics connector only no No connect connection on the PC s 25 pin D po or the PMDX 121 Table 10 PC Parallel Port Connectors pt l and J9 NOTE 1 The PC Pin number column lists the pin numbers as they would appear on the PC s 25 pin D connector when using a standard printer cable NOTE 2 The Select In and Select O ut signals are named relative to the printer s point of view That is why the Select In is an output from the PC and Select O ut in an input NOTE 3 J10 is the Centronics 36 pin connector on the PMDX 121 NOTE 4 The character at the beginning of some of the signal names indicates a signal that is active low measured at the PC s 25 pin D connector when connected to a printer The PMD X 121 does not necessarily use the polarity implied by the signal names Refer to sections 2 2 and 2 5 for information on PMD X 121 signal polarities PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 9 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22
20. odifications Limitations All warranties for this product expressed or implied are limited to 90 days from the date of purchase and no warranties expressed or implied will apply after that period All warranties for this product expressed or implied shall extend only to the original purchaser The liability of Practical Micro Design Inc in respect of any defective product will be limited to the repair or replacement of such product Practical Micro Design Inc may use new or equivalent to new replacement parts Practical Micro Design Inc makes no other representations or warranties as to fitness for purpose merchantability or otherwise in respect of the product No other representations warranties or conditions shall be implied by statute or otherwise In no event shall Practical Micro Design Inc be responsible or liable for any damages arising a from the use of the product from the loss of use of the product from the loss of revenue or profit resulting from the use of the product or asa result of any event circumstance action or abuse beyond the control of Practical Micro D esign Inc whether such damages be direct indirect consequential special or otherwise and whether such damages are incurred by the person to whom this warranty extends or a third party b c d PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 16 of 16 7 September 2004 All Rights Reserved
21. ontacts open to signal an emergency stop condition The PMDX 121 provides a 2 2K ohm pull up resistor on the E Stop input This means that the external emergency stop circuit must be capable of sinking 2 7 mA of current when the switch contacts are closed this should not be a problem for mechanical switches The E Stop and Fault inputs are combined logic O R to drive the Ack status signal to the PC s parallel port NOTE The E Stop signal must be grounded driven low in order for the output buffers to be enabled and for the Ack status signal to the PC parallel port to go low W hen either or both the E Stop active high or Fault active low inputs are asserted the following actions take place e TheACK bit in the PC s status register reads as a 1 e TheLED labeled error when lit reference designator DS10 near J6 is on e TheLED labeled Outputs Enabled when lit reference designator D S1 near the center of the board is off e The status outputs are tri stated with a weak 10K ohm pull down e The relay is de energized e The step and direction outputs may be tri stated with weak 10K ohm pull down depending on the setting of JP2 see section 3 2 PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 12 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and abo
22. r Connector Pin Out J4 PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 5 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above 2 2 Status Input Connector J5 The PMDX 121 supports four general purpo se status input signals These inputs have a low pass RC filter to remove high frequency noise Each signal also has a pull up and an LED that is on when the input signal is driven low The input signals are buffered but not inverted before being passed to the PC parallel port The fifth status input on the PC parallel port is connected to the Fault and E Stop circuitry See sections 4 0 E Stop Input and 5 0 Fault Input for more information Pin Number Label Description 1 5V Auxiliary 5V output for external sensor power Aux Out Pin 11 Status input buffered to PC parallel port pin 11 Busy ce Status input buffered to PC parallel port pin 12 Paper End Li Pin13 Status input buffered to PC parallel port pin 13 Select O ut Pin15 Status input buffered to PC parallel port pin 15 Error e Ground connection Table 6 Status Input Connector Pin Out J5 NOTE Dueto logic inside the PC some status inputs are inverted This means that a logic high output from the PMD X 121 to the PC s parallel port is read as a O in the status register Pleas
23. sed on the setting of jumper JP4 See section 3 4 Pin 17 Output Source for more information The control signal output buffer will be disabled under the following circumstances e The E Stop signal in asserted see section 4 0 E Stop Input e The Fault signal is asserted see section 5 0 Fault Input e or optionally depending on the setting of jumper when the charge pump JP3 a failure in the charge pump circuit see section 3 3 for information on the jumper setting and section 6 0 for information on the charge pump The PMD X 121 provides 10K ohm pull down resistors on all of the control output signals W hen the output buffer is disabled these pull down resistors provide a known logic level low to the external devices N ote that this is a fairly weak pull down and can be overridden externally with a stronger pull up resistor if required WARNING When using the Aux Power In on J8 make sure that no power source is connected to J11 PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 7 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual PCB Revision PCB 440B Document Revision 1 4 Serial N umber 22594 and above Label Description Pin Number 5V 1 Aux Auxiliary 5V output Out Control output from PC parallel port pin 14 Auto Feed Control output from PC parallel port pin 16 Init Control output from PC parallel port pin 17 Select In or logic high
24. tions should be taken to assure that operators are trained in their proper operation and safety procedures and that they are protected from moving parts that may be under remote control and may move unexpectedly This product may not be used in life support or other critical safety applications 1 2 Warranty Summary The PMDX 121 is warranted against failure due to defective parts or workmanship for 90 days from the date of sale Refer to Appendix A for complete warranty details If you have an item requiring service please see the support page on the PMDX web site http www pmdx com for return instructions The purchaser must pay shipping to return the unit to PMDX W e will ship the repaired unit back to you via ground transportation at our expense Repairs are normally completed within 10 business days See Appendix A for our complete warranty details PMDX 121 Manual 14 doc 2004 Practical Micro D esign Inc Page 3 of 16 7 September 2004 All Rights Reserved PMDX 121 User s Manual Document Revision 1 4 1 3 Features The PMD X 121 has the following features PC Parallel Port e Buffers signals to from the PC parallel port e Allows use of all 8 data bits 4 control outputs and 5 status inputs e Centronics cable connector uses standard PC printer cable Status Inputs e 5 each status inputs w pull up resistors e Status signals are buffered e LED indicators for each input Relay Contact O utputs e Isolated rel
25. ve 5 0 Fault Input The Fault input provides an interface for external fault detection circuits such as the fault signals from the PMDX 150 stepper motor drivers This signal is active low meaning that a logic low indicates a fault condition and a logic high means all is OK The fault input is designed to be connected to an external wired or configuration of open collector status signals All of the open collector fault signals should be tied together and connected to the fault input The PMDX 121 provides a 10K ohm pull up resistor on the fault input This means the open collector drivers must be able to sink approximately 0 5 mA of current The E Stop and Fault inputs are combined logic O R to drive the Ack status signal to the PC s parallel port Refer to section 4 0 E Stop Input for a list of actions that take place when the Fault input is drive low NOTE The fault signal must be allowed to float high or be driven high in order for the output buffers to be enabled and for the Ack status signal to the PC parallel port to go low 6 0 Charge Pump watchdog The charge pump circuit also called a watchdog circuit is designed to disable the PMD X 121 outputs when the software running on the PC stops working properly It does this by monitoring pin 17 on the PC parallel port the Select In signal W hen this signal is toggling between high and low the charge
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