MODEL RDAG12-8(H) USER MANUAL
Contents
1. WIN32IRQ This directory provides a generic interface for IRQ handling in Windows 95 98 NT Source code 1s provided for the driver greatly simplifying the creation of custom drivers for specific needs Samples are provided to demonstrate the use of the generic driver Note that the use of IRQs in near real time data acquisition programs requires multi threaded application programming techniques and must be considered an intermediate to advanced programming topic Delphi C Builder and Visual C samples are provided Page 2 2 Manual MRDAG12 8H Bc1 Findbase exe DOS utility to determine an available base address for ISA bus non Plug n Play cards Run this program once before the hardware is installed in the computer to determine an available address to give the card Once the address has been determined run the setup program provided with the hardware to see instructions on setting the address switch and various option selections Poly exe A generic utility to convert a table of data into an nth order polynomial Useful for calculating linearization polynomial coefficients for thermocouples and other non linear sensors Risc bat A batch file demonstrating the command line parameters of RISCTerm exe RISCTerm exe A dumb terminal type communication program designed for RS422 485 operation Used primarily with Remote Data Acquisition Pods and our RS422 485 serial communication product line Can be used to say hello to an installed mode2. re talking to the Pod Repeatedly pressing the Enter key should return this message each time This is a correct indication 2 Type and press enter You should receive back Main Help Screen and three possible other menus to access You could type 3 then press Enter and receive a menu back from the Pod regarding Analog Output Commands If you re receiving these messages you again know that you are communicating effectively with the Pod 3 Connect a DMM set for 20VDC range across pins 1 and 2 of the Pod s screw terminal block Type AC0 0000 00 00 01 0000 and Enter You should receive a CR carriage return from the Pod This command sets Channel 0 for the 0 10V range 4 Now type AO FFFO and Enter You should receive a carriage return from the Pod This command causes Channel 0 to output the commanded value FFF in hex 4096 counts or 12 bit Full Scale You should see the DMM read 10VDC Calibration is discussed in the following section 5 Type A0 8000 and Enter 800 in hex 2048 counts or 12 bit Half Scale You should receive a carriage return from the Pod You should see the DMM read 5VDC 6 You re now ready to begin your development and write your application program Note If you re ultimately going to use the Isolated Mode be sure that you put the jumpers on the processor board back to the ISO positions Also ensure that you wire the power up correctly to supp
3. 2400 4800 9600 14400 19200 Analog Outputs Channels Type e Non Linearity Monotonicity Output Range Output Drive Current Output 28800 and 57600 baud Crystal oscillator provided Eight independent 12 bit double buffered 0 9 LSB maximum bit 0 5V 5V 0 10V Low Power Option 5 mA High Power Option 250 mA 4 20 mA SINK User supplied excitation of 5 5V 30V Output Resistance 0 5 Settling Time Digital I O 15 usec to 2 LSB Seven bits configured as input or output Digital Inputs Digital Outputs Logic High 2 0V to 5 0V at 20HA max SmA max at 50V in Protected to 200 VDC Logic Low 0 5V to 0 8V at 0 4 mA max Protected to 140 VDC Logic Low Sink Current 350 mA maximum See note below Inductive kick suppression diode included in each circuit Note Maximum allowable current per output bit is 350 mA When all seven bits are used there is a maximum total current of 650 mA High Level Output Voltage Open Collector compliance with up to 50V DC user supplied voltage If no user supplied voltage exists outputs pulled up to 5 VDC via 10 KQ resistors Manual MRDAG12 8H Bc1 Page 1 3 RDAG12 8 Manual Interrupt Input For use with development kit Input Low 0 3V to 0 8V Input Low Current at 0 45V S5u A Input High 2 0V to 5 0V Environmental The environmental characteristics depend on the RDAG12 8 confi
4. Digital Input Output 6 17 19 21 23 25 27 VOUT4 Analog Volt Output 4 AOGND Analog Output Ground APGS Analog Power Ground 5 VOUTS Analog Volt Output 5 APG6 Analog Power Ground 6 VOUT6 Analog Volt Output 6 APPLV Application Power Ground 7 VOUT7 Analog Volt Output 7 APG7 Analog Power Ground 7 Table 2 1 50 Pin Connector Assignments Terminal markings and their functions are as follows PWR and GND Pins 7 15 31 35 and 37 These terminals are used to apply local power to the Pod from a local power supply Pins 35 and 36 are tied together The voltage can be anywhere in the range of 12 VDC to 16 VDC Higher voltage can be used 24 VDC for example if an external Zener diode is used to reduce the voltage applied to the RDAG12 8 See the Specification section of this manual to determine the Zener diode power rating required PWR Pin 40 This terminal accepts customer supplied 12V to 18 VDC 2A max It is used only in the High Power option RDAG12 8H Manual MRDAG12 8H Bc1 Page 2 7 RDAG12 8 Manual ISOV and ISOGND This is the power connection for the isolator section that may be supplied from the computer s 12VDC supply via a pair of wires on the RS 485 network or from a central power supply This power is independent of local power The voltage level can be from 7 5 VDC to 35 VDC An on board voltage regulator regulates the power to 5 VDC RDAG12 8 will require only about 5 mA of current when idling
5. address is programmable from 00 to FF hex and whatever address is assigned is stored in EEPROM and used as the default address at the next Power ON Similarly the baud rate is programmable for 1200 2400 4800 9600 14400 19200 28800 and 57600 The baud rate is stored in EEPROM and used as default at the next Power ON Analog Outputs These units consist of eight independent 12 bit digital to analog converters DACs and amplifiers for voltage outputs and voltage to current conversion The DACs may be updated in a channel by channel mode or simultaneously There are eight channels of voltage output and eight complimentary channels for 4 20mA current output sinks The output voltage ranges are software selectable Calibration is performed by software Factory calibration constants are stored in the EEPROM memory and can be updated by disconnecting the I O wiring and entering the software calibration mode Model RDAG12 8 can supply analog outputs of up to 5 mA on voltage ranges of 0 5V 5V and 0 10V By writing discrete values of a desired waveform into the buffers and loading the buffers into the DAC at a programmable rate 31 6 000Hz the units can generate arbitrary waveforms or control signals Model RDAG12 8H is similar except that each DAC output can drive loads up to 250mA using a 12V 2 5A local power supply RDAG12 8H is packaged in a non sealed T Box steel enclosure Digital I O Both models also have seven digital input outp
6. 1 to a simple stair step SEND A1 0000 0000 CR RECEIVE CR SEND A1 0001 8000 CR RECEIVE CR SEND A1 0002 FFFO CR RECEIVE CR SEND A1 0003 8000 CR RECEIVE CR Read Buffer from DAC n An iii Reads from buffer 0 lt n lt 7 0 lt 1111 lt 800h Example Read buffer entry number 2 for DAC 1 SEND A1 0002 CR RECEIVE FFFO CR Start Buffered DAC Output on DAC n An GOGOGO Writes buffer to DAC n at a timebase rate Example Begin Buffer writing on DAC 5 SEND A5 GOGOGO CR Manual MRDAG12 8H Bc1 Page 3 3 RDAG12 8 Manual RECEIVE CR Stop Buffered DAC Outputs on DAC n An STOP Ceases writing DAC n buffer to DAC Example Immediately cease pattern output on DAC 5 SEND A5 STOP CR RECEIVE CR Set Acquisition Rate S xxxx or s Set or read acquisition rate 0100 lt xxxx lt FFFP This function sets the update rate of the DAC Valid values range from 0100 to FFFF The value passed is the desired divisor of the rate clock 11 0592 MHz The equation to use in calculating the divisor is Divisor Clock 12 Rate or 921000 Rate Example Program the RDAG12 8 for 1K samples per second SEND S 0399 CR RECEIVE CR Note The sample rate configured is stored in EEPROM on the Pod and will be used as the default power on sample rate The factory default sample rate 100Hz or S 2400 can be restored by sending S 0000 to the Pod Configure Buffers and DACs ACn xx
7. devices is not much different from working with standard RS232 serial devices and these two standards overcome deficiencies in the RS232 standard First the cable length between two RS232 devices must be short less than 50 feet at 9600 baud Second many RS232 errors are the result of noise induced on the cables The RS422 standard permits cable lengths up to 4000 feet and because it operates in the differential mode it is more immune to induced noise Connections between two RS422 devices with CTS ignored should be as follows Table A 1 Connections Between Two RS422 Devices A third deficiency of RS232 is that more than two devices cannot share the same cable This is also true for RS422 but RS485 offers all the benefits of RS422 plus allows up to 32 devices to share the same twisted pairs An exception to the foregoing is that multiple RS422 devices can share a single cable if only one will talk and the others will all receive Balanced Differential Signals The reason that RS422 and RS485 devices can drive longer lines with more noise immunity than RS232 devices is that a balanced differential drive method is used In a balanced differential system the voltage produced by the driver appears across a pair of wires A balanced line driver will produce a differential voltage from 2 to 6 volts across its output terminals A balanced line driver can also have an input enable signal that connects the driver to its output terminals If the
8. enable signal is OFF the driver is disconnected from the transmission line This disconnected or disabled condition is usually referred to as the tristate condition and represents a high impedance RS485 drivers must have this control capability RS422 drivers may have this control but it is not always required Manual MRDAG12 8H Bc1 Page A 1 RDAG12 8 Manual A balanced differential line receiver senses the voltage state of the transmission line across the two signal input lines If the differential input voltage is greater than 200 mV the receiver will provide a specific logic state on its output If the differential voltage input is less than 200 mV the receiver will provide the opposite logic state on its output A maximum operating voltage range is from 6V to 6V allows for voltage attenuation that can occur on long transmission cables A maximum common mode voltage rating of 7V provides good noise immunity from voltages induced on the twisted pair lines The signal ground line connection is necessary in order to keep the common mode voltage within that range The circuit may operate without the ground connection but may not be reliable Driver Output Voltage unloaded GEBE Driver Output Voltage loaded LD and LDGND Driver Output Resistance Driver Output Short Circuit Current Receiver Common Mode Voltage Range Receiver Input Resistance Table A 2 RS422 Specification Summary Driver Output Rise Time EEE Receiver Sensitiv
9. place of n all DACs are affected S xxxx or S Set or read acquisition rate 00A3 lt xxxx lt FFFF xxxx CR ACn xxx0 dd tt mm Configure Analog Outputs See body text Hii BACKUP BUFFER Write buffer into EEPROM CR BUFFER BACKUP Read EEPROM into buffer CR Read calibration data for n bbbb mmmm CR mg ee BAUD nnn Set communication baud rate 1 lt n lt 7 Baud 0n CR Set digital mask to xx is output 0 is input CR Set bit x of digital mask to output or input Read the 7 digital input bits or bit n xx a Write byte xx to digital outputs 7 bits are significant CR Turn on or off digital bit n 0 lt n lt 6 CR Table 3 1 RDAG12 8 Command List Page 3 2 Manual MRDAG12 8H Bc1 Note Pod reset occurs upon power up programming process or watchdog time out Command Functions The following paragraphs give details of the command functions describe what the commands cause and give examples Please note that all commands have an acknowledgement response You must wait for a response from a command before sending another command Write to DAC Channel An xxx0 Writes xxx to DAC n Set polarity and gain using the AC command Example Program the Analog output number 4 to half scale zero volts bipolar or half scale unipolar SEND A4 8000 CR RECEIVE CR Load Buffer for DAC n An 1ili xxx0 Writes xxx to DAC n buffer 1111 Example Program buffer for DAC
10. received from the Pod are in hexadecimal form The factory default baud rate is 9600 Baud The Pod is considered to be in addressed mode any time its Pod address is not 00 The factory default Pod address is 00 non addressed mode Addressed Mode The address select command must be issued before any other command to the addressed Pod The address command is as follows Ixx CR where xx is the Pod address from 01 to FF hex and CR is Carriage Return ASCII character 13 The Pod responds with CR Once the address select command has been issued all further commands other than a new address select will be executed by the selected Pod The addressed mode is required when using more than one Pod When there s only one Pod connected no address select command is needed You can merely issue commands listed in the following table Terminology used is as follows The single lower case letter x designates any valid hex digit 0 E The single lower case letter b designates either a 1 or 0 The symbol designates either a or a All commands are terminated with CR the ASCII character 13 All commands are not case sensitive i e upper or lower case may be used The symbol means zero or more valid characters total msg length lt 255 decimal m o e gt General Note ALL numbers passed to and from the Pod are in hexadecimal Manual MRDAG12 8H Bc1 Page 3 1 RDAG12 8 Manual If the letter A is sent in
11. to which the equipment is exposed other than that use specified or intended as evidenced by purchase or sales representation Other than the above no other warranty expressed or implied shall apply to any and all such equipment furnished or sold by ACCES Page Hi Table of Contents Chapter 1 Introduction a a 1 1 a ec s sua a pakaq ss sama n ahua uD Pa s a kin ee aO s ER SDECHEAIONS een Lu akha ee ee ee Chapter 2 Installation oooooooocrrrnnn nn nn nn nn CD installation srs zu O ee a a BE ee ern Directories Created on the Hard Disk Getting MASON amp 7 0 MON ie oa Installation a Input Output Pin Connections 22 24 44 320425444284045 45 rien Chapters SoflWare 06 mogna cna a ann A 5 l helo a ee Generali eae ete Be es tees de a ek ge s ee eee Command Structure Command Functions nn EIOFGOGES x uu u nus da eee cooks bcos Sipan span p ao Boss date atap gence Bonsante e Quy Ba gS yaa gn pusa 3 Appendix A Application Considerations IAtrodellon u u E us nme eras S Chu Od aba Balanced Differential Signals RS485 Data Transmission Appendix B Thermal Considerations B 1 Page iv List of Figures Figure 1 1 RDAG12 8 Block Diagram Page 1 6 Figure 1 2 RDAG12 8 Hole Spacing Diagram Page 1 7 Figure 2 1 Simplifie
12. 2 8 Manual Page A 4 Manual MRDAG12 8H Bc1 Appendix B Thermal Considerations The low power version of the RDAG12 8 ships installed in a NEMA 4 box 8 75 long by 5 75 wide by 2 25 high The box has two round openings with a rubber glands for routing and sealing the I O cables When all 8 output channels are loaded with a 10mA load 5Vdc the power dissipation of the RDAG12 8 is 5 8W The thermal resistance of the box with an installed RDAG12 8 card is 4 44 C W At Tambien 25 C the temperature inside the box is 47 75 C The allowed temperature rise inside the box is 70 47 75 22 25 C Thus the maximum ambient operating temperature is 25 22 25 47 5 C The RDAG12 8 high power version can be packaged in several ways a In the T box 8 5 x5 25 x2 with a 4 5 x 5 slot for cable routing and air circulation b In an open enclosure exposed to free air c In free air with air circulation provided by the customer When the high power option is elected special attention must be paid to heat generation and heat sinking The output amplifiers are capable of delivering 3A at output voltage ranges 0 10V 5V 0 5V However the capability to dissipate the heat generated in the amplifiers limits the permissible load current This capability is determined in a significant degree by the type of enclosure the RDAG12 8 is packaged in When installed in the T box the total power dissipation can be estimated using the following calculations The p
13. A number which must appear on the outer label of the return package All units components should be properly packed for handling and returned with freight prepaid to the ACCES designated Service Center and will be returned to the customer s user s site freight prepaid and invoiced Coverage First Three Years Returned unit part will be repaired and or replaced at ACCES option with no charge for labor or parts not excluded by warranty Warranty commences with equipment shipment Following Years Throughout your equipment s lifetime ACCES stands ready to provide on site or in plant service at reasonable rates similar to those of other manufacturers in the industry Equipment Not Manufactured by ACCES Equipment provided but not manufactured by ACCES is warranted and will be repaired according to the terms and conditions of the respective equipment manufacturer s warranty General Under this Warranty liability of ACCES is limited to replacing repairing or issuing credit at ACCES discretion for any products which are proved to be defective during the warranty period In no case is ACCES liable for consequential or special damage arriving from use or misuse of our product The customer is responsible for all charges caused by modifications or additions to ACCES equipment not approved in writing by ACCES or if in ACCES opinion the equipment has been subjected to abnormal use Abnormal use for purposes of this warranty is defined as any use
14. ES 1 0 PRODUCTS INC 10623 Roselle Street San Diego CA 92121 Tel 858 550 9559 FAX 858 550 7322 www accesioproducts com
15. TPUT OUTPUT LATCHES DRIVERS APPL V O PROVIDES FLYBACK PROTECTION Figure 1 1 RDAG12 8 Block Diagram Manual MRDAG12 8H Bc1 Page 1 6 7 6 4 6 Figure 1 2 RDAG12 8 Hole Spacing Diagram Manual MRDAG12 8H Bc1 Page 1 7 Chapter 2 Installation The software provided with this card is contained on CD and must be installed onto your hard disk prior to use To do this perform the following steps applicable for your operating system Substitute the appropriate drive letter for your CD ROM where you see d in the examples below CD Installation WIN95 98 NT 2000 a Place the CD into your CD ROM drive b The install program should automatically run after 30 seconds If the install program does not run click START RUN and type d install click OK or press Exe Follow the on screen prompts to install the software for this card Directories Created on the Hard Disk The installation process will create several directories on your hard disk If you accept the installation defaults the following structure will exist CARDNAME Root or base directory containing the SETUP EXE setup program used to help you configure Jumpers and calibrate the card DOS PSAMPLES A subdirectory of CARDNAME that contains Pascal samples DOS CSAMPLES A subdirectory of CARDNAME that contains C samples Win32 language Subdirectories containing samples for Win95 98 and NT WinRISC exe A Windows dumb terminal type communica
16. and 33mA current when data is being transmitted so any loading effects on the computer power if used will be low Note If separate power is not available ISOV and ISOGND must be jumpered to the local power terminals which defeats the optical isolation RS485 and RS485 These are the terminals for RS485 communications TRx and TRx APPLV This terminal is for the application power or the user provided voltage source to which digital outputs are connected through the loads Open collector Darlington amplifiers are used at the outputs Inductive suppression diodes are included in the APPLV circuit The application power level APPLV can be as high as 50 VDC APGO 7 These terminals are for use with the High Power version of the Pod RDAG12 8H Connect all load returns to these terminals AOGND These terminals are for use with the Low Power version of the Pod Use these for returns of voltage outputs as well as current outputs GND These are general purpose grounds which can be used for Digital Bit returns Power return connections and so on To ensure that there is minimum susceptibility to EMI and minimum radiation it is important that there be a positive chassis ground Also proper EMI cabling techniques cable connected to chassis ground twisted pair wiring and in extreme cases ferrite level of EMI protection may be needed for input output wiring VOUTO 7 Analog Output Voltage signal use in conjunction wi
17. d Schematic for Voltage and Current Sink Outputs Page 2 9 Figure A 1 Typical RS485 Two Wire Multidrop Network Page A 3 List of Tables Table 2 1 50 Pin Connector Assignments Page 2 7 Table 3 1 RDAG12 8 Command List Page 3 2 Table A 1 Connections Between Two RS422 Devices Page A 1 Table A 2 RS422 Specification Summary Page A 2 Page v Chapter 1 Introduction Features Remote Intelligent Analog Output and Digital I O Units with Opto Isolated RS485 Serial Interface to Host Computer Eight 12 Bit Analog Current Sinks 4 20mA and Voltage Outputs Software Selectable Voltage Ranges of 0 5V 0 10V 5V Low Power and High Power Analog Output Models Seven Bits of Digital I O Configured on a Bit by Bit Basis as either Inputs or High Current Outputs Field Connections Accomplished via 50 pin Removable Screw Terminals Onboard 16 bit 8031 Compatible Microcontroller All Programming and Calibration in Software No Switches to Set Jumpers Available to By Pass Opto Isolators if Desired Protective NEMA4 Enclosure for Harsh Atmospheric and Marine Environments for Low Power Standard Model Protective Metal T Box for High Power Model Description RDAG12 8 is an intelligent 8 channel digital to analog converter unit that communicates with the host computer via EIA RS 485 Half Duplex serial co
18. d terminal program which can also be used in Windows 3 x and 9x For Windows 9x NT 4 NT 2000 you can use our WinRISC program You can select the COM port number COMS COM8 etc baud data bits parity and stop bits ACCES Pods ship at 9600 7 E 1 respectively The simplest test to see if you have a good COM port without connecting anything to the COM Port connector on the back of your computer is to select either COM 1 or COM 2 whichever one is showing up in your device manager from WinRISC See Running WinRISC then clicking on Connect If you don t get an error that is a very good sign that you re in business Click the checkbox called local echo then click into the text window where you should see the blinking cursor and start typing If you ve Manual MRDAG12 8H Bc1 Page 2 3 RDAG12 8 Manual succeeded in getting to the last step you re ready to connect the hardware and attempt to communicate with it 2 After you have verified that you are able to communicate through your COM port set up your COM card for half duplex RS 485 and wire it up using two wires to the Pod You may need to move some jumpers on the COM board to accomplish this Or if you re using our RS 232 485 Converter please connect it at this time Communication with the Pod should be two wire RS 485 Half Duplex with Termination and Bias applied Also select No Echo where Echo exists on the COM card See your manual for the COM card f
19. d the cover is secured to the body by four recessed M 4 stainless steel captive screws Two long M 3 5 X 0 236 screws are provided for mounting to the body Mounting holes and cover attaching screws are outside the sealed area to prevent ingress of moisture and dust Four threaded bosses inside the enclosure provide for mounting the printed circuit card assemblies To install the card without the box in your own enclosure see Figure 1 2 for the hole spacing The RDAG12 8H enclosure is a non sealed steel enclosure painted IBM Industrial Gray The enclosure measures 8 5 long by 5 25 wide by 2 high There are three jumper locations on the unit and their functions are as follows JP2 JP3 and JP4 Normally these jumpers should be in the ISL position If you wish to by pass the opto isolators then you can move these jumpers to the ISL position Input Output Pin Connections Electrical connections to the RDAG12 8 are through a watertight gland that seals the wires and are terminated inside to a Euro style screw terminal block that plugs into a50 pin connector Electrical connections to the RDAG12 8H are through openings on the end of the T Box terminated in the same Euro style screw terminal block Connector pin assignments for the 50 pin connector follow Page 2 6 Manual MRDAG12 8H Bc1 Pin Sima Pin Signal 5 vourz_ Analog Volt Output 2 6 APG2 Analog Power Ground 2 GND Local Power Ground 8 DIO6
20. ds will return an error 4 if an attempt is made to write to a bit configured as an input Writing a one to a bit asserts the pull down for that bit Writing a zero de asserts the pull down Therefore if the factory default 5V pull up is installed writing a one will cause zero volts to be at the connector and writing a zero will cause 5 volts to be asserted Examples Write a one to bit 6 set output to zero volts assert the pull down SEND O6 CR RECEIVE CR Page 3 6 Manual MRDAG12 8H Bc1 Write a zero to bit 2 set output to 5V or user pull up SEND O2 CR or SEND 002 CR RECEIVE CR Write zeros to bits 0 7 SEND O00 CR RECEIVE CR Write zeros to every odd bit SEND OAA CR RECEIVE CR Read Firmware Revision Number V Read the firmware revision number This command is used to read the version of firmware installed in the Pod It returns X XX CR Example Read the RDAG12 8 version number SEND V CR RECEIVE 1 00 CR Note The H command returns the version number along with other information See Hello Message following Resend Last Response n Resend last response This command will cause the Pod to return the same thing it just sent This command works for all responses less than 255 characters in length Normally this command is used if the host detected a parity or other line fault while receiving data and needs the data to be sent a second time The n com
21. e amplifier is 12 5 x 250 1 750W The maximum allowed junction temperature is 125 C Assuming the junction to case and case to heat sink surface thermal resistance for the TO 220 package is 3 C W and 1 C W respectively The junction 0 heat sink resistance R 4 C W The temperature rise between the heat sink surface and the junction is 4 C W x1 75W 7 C Thus the allowed maximum temperature of the heat sink is 125 107 18 C Therefore if any of the channels of the RDAG12 8 has a 250mA load the ambient temperature rise is limited to 18 C The allowable maximum ambient temperature will be 25 18 43 C If forced air cooling is provided then the following calculation will determine the allowable load for the RDAG12 8 allowable power dissipation for the power amplifier Page B 2 P 125 C T amb max Rus R us where Heatsink thermal resistance Rys 21 C W Junction to heatsink surface thermal resistance Ryys 4 C W Operating temperature range 0 50 C Maximum ambient temperature T mb max 50 C At air velocity of lt 100 ft min Pu 3W At air velocity of 100 ft min Pu SW As determined by the heat sink characteristics Manual MRDAG12 8H Bc1 Customer Comments If you experience any problems with this manual or just want to give us some feedback please email us at manuals accesioproducts com Please detail any errors you find and include your mailing address so that we can send you any manual updates ya ACC
22. ers and search for WinRISC You can also explore the CD and look for disks tools win Win32 WinRISC exe 2 Once you rein WinRISC select a baud rate of 9600 factory default for the Pod Select Local Echo and the following other settings Parity Even Data Bits 7 Stop Bits 1 Leave other settings at the default Select the verified COM port top left and click on Connect 3 Click into the main box You should see a blinking cursor 4 Type a few characters You should see them print to the screen 5 Proceed to the section TALKING TO THE POD Page 2 4 Manual MRDAG12 8H Bc1 Running RISCterm 1 For Win 95 98 run the program RISCTerm exe found in Start Programs RDAG12 8 For DOS or Win 3 x look in CARDAG12 38 2 Enter the base address of the COM card then enter the IRQ In Windows this information is available by viewing the ControlPanel System DeviceManager Ports Properties Resources 3 Once you re in RISCTerm verify a selection of 9600 baud factory default for the Pod The bar across the bottom of the screen should say 7E1 4 Type a few letter characters You should see them print to the screen 5 Proceed to the section TALKING TO THE POD Talking to the Pod 1 Picking up from step 5 of RUNNING WINRISC or RUNNING RISCTERM Press the Enter key afew times You should receive Error use for command list unrecognized command This is your first indication that you
23. g ACCES I O PRODUCTS INC 8 10623 Roselle Street San Diego CA 92121 TEL 858 550 9559 FAX 858 550 7322 MODEL RDAG12 8 H USER MANUAL FILE MRDAG12 8H Bc1 Notice The information in this document is provided for reference only ACCES does not assume any liability arising out of the application or use of the information or products described herein This document may contain or reference information and products protected by copyrights or patents and does not convey any license under the patent rights of ACCES nor the rights of others IBM PC PC XT and PC AT are registered trademarks of the International Business Machines Corporation Printed in USA Copyright 2000 by ACCES I O Products Inc 10623 Roselle Street San Diego CA 92121 All rights reserved Warranty Prior to shipment ACCES equipment is thoroughly inspected and tested to applicable specifications However should equipment failure occur ACCES assures its customers that prompt service and support will be available All equipment originally manufactured by ACCES which is found to be defective will be repaired or replaced subject to the following considerations Terms and Conditions If a unit is suspected of failure contact ACCES Customer Service department Be prepared to give the unit model number serial number and a description of the failure symptom s We may suggest some simple tests to confirm the failure We will assign a Return Material Authorization RM
24. guration Low and High power output configurations Operating Temperature Range 0 C to 65 C Optional 40 C to 80 C Temperature De rating Based on the power applied maximum operating temperature may have to be de rated because internal power regulators dissipate some heat For example when 7 5VDC is applied the temperature rise inside the enclosure is 7 3 C above the ambient temperature Note Maximum operating temperature can be determined according to the following equation Vics 120 lt 22 5 0 2T 4 Where T is the ambient temperature in C and V yr 120 is the voltage at which the integral voltage regulator junction temperature will rise to a temperature of 120 C Note The junction temperature is rated to 150 C maximum For example at an ambient temperature of 25 C the voltage V can be up to 17 5V At an ambient temperature of 100 F 37 8 C the voltage V can be up to 14 9V Humidity 5 to 95 RH non condensing Size NEMA 4 Enclosure 4 53 long by 3 54 wide by 2 17 high Page 1 4 Manual MRDAG12 8H Bc1 Power Required Power can be applied from the computer s 12VDC power supply for the opto isolated section via the serial communication cable and from a local power supply for the rest of the unit If you do not wish to use power from the computer a separate power supply isolated from the local power supply may be used for the opto isolated section The power used by thi
25. her commands to that particular Pod This command needs to be issued only once prior to executing any other commands Once the address select command has been issued that Pod will respond to all other commands until a new address select command 1s issued Manual MRDAG12 8H Bc1 Page 3 9 RDAG12 8 Manual Error Codes The following error codes can be returned from the Pod 1 Invalid channel number too large or not a number All channel numbers must be between 00 and 07 3 Improper Syntax Not enough parameters is the usual culprit 4 Channel number is invalid for this task For example if you try to output to a bit that is set as an input bit that will cause this error 9 Parity error This occurs when some part of the received data contains a parity or framing error Additionally several full text error codes are returned All begin with Error and are useful when using a terminal to program the Pod Error Unrecognized Command command received CR This occurs if the command is not recognized Error Command not fully recognized Command received CR This occurs if the first letter of the command is valid but the remaining letters are not Error Address command must be CR terminated CR This occurs if the address command xx CR has extra characters between the Pod number and the CR Page 3 10 Manual MRDAG12 8H Bc1 Appendix A Application Considerations Introduction Working with RS422 and RS485
26. his directory contains sixteen bit DLL drivers for use with VisualBASIC 3 0 and Windows 3 1 only These drivers provide four functions similar to the ACCES32 DLL However this DLL is only compatible with 16 bit executables Migration from 16 bit to 32 bit is simplified because of the similarity between VBACCES and ACCES32 PCI This directory contains PCI bus specific programs and information If you are not using a PCI card this directory will not be installed SOURCE A utility program is provided with source code you can use to determine allocated resources at run time from your own programs in DOS PCIFind exe A utility for DOS and Windows to determine what base addresses and IRQs are allocated to installed PCI cards This program runs two versions depending on the operating system Windows 95 98 NT displays a GUI interface and modifies the registry When run from DOS or Windows3 x a text interface is used For information about the format of the registry key consult the card specific samples provided with the hardware In Windows NT NTioPCLSY S runs each time the computer is booted thereby refreshing the registry as PCI hardware is added or removed In Windows 95 98 NT PCIFind EXE places itself in the boot sequence of the OS to refresh the registry on each power up This program also provides some COM configuration when used with PCICOM ports Specifically 1t will configure compatible COM cards for IRQ sharing and multiple port issues
27. ity VE To prevent signal reflections in the cable and to improve noise rejection in both the RS422 and RS485 mode the receiver end of the cable should be terminated with a resistance equal to the characteristic impedance of the cable An exception to this is the case where the line is driven by an RS422 driver that is never tri stated or disconnected from the line In this case the driver provides a low internal impedance that terminates the line at that end Page A 2 Manual MRDAG12 8H Bc1 RS485 Data Transmission The RS485 Standard allows a balanced transmission line to be shared in a party line mode As many as 32 driver receiver pairs can share a two wire party line network Many characteristics of the drivers and receivers are the same as in the RS422 Standard One difference is that the common mode voltage limit is extended and is 12V to 7V Since any driver can be disconnected or tri stated from the line it must withstand this common mode voltage range while in the tristate condition The following illustration shows atypical multidrop or party line network Note that the transmission line is terminated on both ends of the line but not at drop points in the middle of the line TERMINATION RESISTORS He TX ENABLE RX ENABLE ZRI Kr TX ENABLE TX ENABLE RX ENABLE RX ENABLE Figure A 1 Typical RS485 Two Wire Multidrop Network Manual MRDAG12 8H Bc1 Page A 3 RDAG1
28. m RISCTerm stands for Really Incredibly Simple Communications TERMinal Getting Started To begin working with the pod you first need an available working serial communications port on your PC This can be either one of our RS422 485 Serial Communication cards or an existing RS 232 port with a 232 485 two wire converter attached Next install the software from the 3 2 diskette RDAG12 8 Software Package You should also run the RDAG12 8 setup program which is on the 3 2 diskette to help you with option selection 1 Verify that you are able to communicate through the COM port see details in the appropriate COM card manual View Control Panel Ports NT 4 or Control Panel System Device Manager Ports Properties Resources 9x NT 2000 for information about installed COM ports Communication verification can be done by using a loop back connector with the card in full duplex RS 422 mode A working knowledge of serial ports in Windows will significantly contribute to your success You may have built in COM ports 1 amp 2 on your Motherboard but the software necessary to support them may not be installed in your system From the Control Panel you may need to add new hardware and select standard serial communication port to add a COM port to your system You may also need to check in the BIOS to ensure that the two standard serial ports are enabled We provide two terminal programs to aid with this task RISCTerm is a DOS base
29. mand may be repeated Example Assuming the last command was I ask Pod to resend last response SEND n RECEIVE FF CR or whatever the data was Manual MRDAG12 8H Bc1 Page 3 7 RDAG12 8 Manual Hello Message H Hello message Any string of characters starting with H will be interpreted as this command H CR alone is also acceptable The return from this command takes the form without the quotes Pod aa RDAG12 8 Rev rr Firmware Ver x xx ACCES I O Products Inc aa is the Pod address rr is the hardware revision such as B1 X xX is the software revision such as 1 00 Example Read the greeting message SEND Hello CR RECEIVE Pod 00 RDAG12 8 Rev B1 Firmware Ver 1 00 ACCES VO Products Inc CR Configure Baud Rate When Shipped by Acces the Baud Rate Is Set at 9600 BAUD nnn Program the Pod with a new baud rate This command sets the Pod to communicate at a new baud rate The parameter passed nnn is slightly unusual Each n is the same digit from the following table et j 9600 14400 19200 28800 57600 Therefore valid values for the command s nnn are 000 111 222 333 444 555 666 or 777 The Pod returns a message indicating it will comply The message is sent in the old baud rate not the new one Once the message is transmitted the Pod changes to the new baud rate The new baud rate is stored in EEPROM and will be used even after power reset until the next BAUD nnn command is is
30. mmunications standard ASCII based command response protocol permits communication with virtually any computer system RDAG12 8 is one of a series of remote intelligent Pods called the REMOTE ACCES Series As many as 32 REMOTE ACCES Series Pods or other RS485 devices may be connected on a single two or four wire multidrop RS485 network RS485 repeaters may be used to extend the number of Pods on a network Each unit has a unique address Communication uses a master slave protocol wherein the Pod talks only if questioned by the computer An 80C310 Dallas microcontroller with 32k x 8 bits RAM 32K bits non volatile EEPROM and a watchdog timer circuit gives RDAG12 8 the capability and versatility expected from a modern distributed control system RDAG12 8 contains CMOS low power circuitry an optically isolated receiver transmitter and power conditioners for local and external isolated power It can operate at baud rates up to 57 6 Kbaud and distances up to 4000 feet with low attenuation twisted pair cabling such as Belden 9841 or equivalent Data collected by the Pod can be stored in local RAM and accessed later through the computer s serial port This facilitates a stand alone Pod mode of operation Manual MRDAG12 8H Bc1 Page 1 1 RDAG12 8 Manual All programming of RDAG12 8 is in ASCH based software ASCII based programming permits you to write applications in any high level language that supports ASCII string functions The module or Pod
31. or further details You also have to wire appropriate power to the Pod terminals See the Screw Terminal Pin assignments for help with this For best results you ll need 12V and a return to power the pod in the non isolated mode For bench testing and setup with one power supply you ll need to install wire jumpers between the following terminals on the terminal block ISOV to PWR and ISOGND to GND This defeats the optical isolation feature of the Pod but eases the development setup and only requires one power supply You should also check the processor board as described in Option Selection to ensure the jumpers JP2 JP3 and JP4 are in the ISO position 3 Verify your wiring then turn on power to the Pod If you re checking the current draw should be approximately 250mA 4 Now you can again run the setup and calibration program DOS Win3 x 9x This time the setup program should auto detect the Pod from the auto detect menu item and allow you to run the calibration routine If you re using Windows NT you can run the setup program to set the jumpers regarding isolated or non isolated communication To run the calibration routine just use a DOS boot disk then run the program We can provide this if necessary Running WinRISC 1 For Windows 9x NT 4 NT 2000 start the WinRISC program which should be accessible from the start menu Start Programs RDAG12 8 WinRISC If you can t find it go to Start Find Files or Fold
32. ort that mode It requires 12V of local power and 12V of isolated power Isolated Power can be supplied from the computer s power supply or some other central supply Current draw on this source is negligible so voltage drop in the cable is of no consequence Be aware that the High Power Pod version RDAG12 8H requires 12V Gnd and 12V for Local Power Manual MRDAG12 8H Bc1 Page 2 5 RDAG12 8 Manual Calibration The setup software provided with the RDAG12 8 and RDAG12 8H supports the ability to check calibration and to write correction values into EEPROM so they are available automatically on power up Calibration checks need only be performed periodically not every time power is cycled The SETUP EXE software calibration procedure can be used to calibrate all three ranges and store the values in the EEPROM For Windows NT you ll need to boot to DOS to run this program You can create a DOS boot disk from any Windows system not running NT We can provide a DOS boot disk if necessary The SAMPLE1 program illustrates the procedure of recalling these values and adjusting the readings The description of the CALn command shows the order in which the information is stored in the EEPROM Installation The RDAG12 8 enclosure is a sealed die cast aluminum alloy NEMA 4 enclosure that is easily mounted Outside dimensions of the enclosure are 8 75 long by 5 75 wide by 2 25 high The cover incorporates a recessed neoprene gasket an
33. ower dissipated in the output amplifier for each channel is Pda Vs Vout x ILoad Where Pda Power dissipated in the output power amplifier Vs Power supply voltage Iload Load current Vout Output voltage Thus if the power supply voltage Vs 12v the output voltage range is 0 5V and the load is 40Ohms the power dissipated in the output amplifier by the load current is 7V x 125A 875W The power dissipated by the quiescent current Io 016A Po 24Vx 016A 4w Thus the total power dissipated in the amplifier is 1 275W In the idle mode of operation the outputs not loaded at 25 C ambient air temperature the temperature inside the box in the proximity of the power amplifiers is 45 C The power dissipation in the idle mode is 6 7W The thermal resistance of the box Ren measured in the proximity of the power amplifiers is estimated to be 2 C W Thus the allowed output power for a maximum temperature inside the enclosure 70 C is 25 C 2 C w 12 5W at 25 C ambient air temperature Thus the allowed total power dissipation with outputs driving resistive loads is 19 2W at 25 C ambient temperature Derating for the ambient temperature rise is 1 R meno SW for each degreeC of ambient temperature rise Operation In Free Air Manual MRDAG12 8H Bc1 Page B 1 RDAG12 8 Manual The heatsink temperature of the amplifier supplying 250A at 5V DC can reach100 C max measured at ambient room temperature of 25 C The power dissipated by th
34. res digital bits as inputs or outputs Mx Configures digital bit x as output Mx Configures digital bit x as input These commands program the digital bits on a bit by bit basis as input or output A zero in any bit position of the xx control byte designates the corresponding bit to be configured as an input Conversely a one designates a bit to be configured as an output Note Any bit configured as an output can still be read as an input if the current value output is a one Manual MRDAG12 8H Bc1 Page 3 5 RDAG12 8 Manual Examples Program even bits as outputs and odd bits as inputs SEND MAA CR RECEIVE CR Program bits 0 3 as input and bits 4 7 as output SEND MFO CR RECEIVE CR Read Digital Inputs I Read 7 bits In Read bit number n These commands read the digital input bits from the Pod All byte responses are sent most significant nibble first Examples Read ALL 7 bits SEND I CR RECEIVE FF CR Read only bit 2 SEND I2 CR RECEIVE 1 CR Write Digital Outputs Oxx Write to all 7 digital output bits Port 0 Ox Set bit x hi or low These commands write outputs to digital bits Any attempt to write to a bit configured as an input will fail Writing to a byte or word wherein some bits are input and some are output will cause the output latches to change to the new value but the bits which are inputs will not output the value until unless they are placed in output mode Single bit comman
35. s section is minimal less than 0 5W Low power version Local Power 12 to 18 VDC 200 mA See box that follows Opto Isolated Section 7 5 to 25 VDC 40 mA Note Due to the small amount of current required voltage drop in long cables is not significant High power version Local Power 12 to 18 VDC at up to 2 1 2 A and 12 to 18V at 2A depending on the output load drawn Opto Isolated Section 7 5 to 25 VDC 50 mA Note Due to the small amount of current required voltage drop in long cables is not significant Note If the local power supply has an output voltage greater than 18VDC you can install a Zener diode in series with the supply voltage The voltage rating of the Zener diode V should be equal to V 18 where V is the power supply voltage The power rating of the Zener diode should be gt V x0 12 watts Thus for example a 26VDC power supply would require using an 8 2V Zener diode with a power rating of 8 2 x 0 12 1 watt Manual MRDAG12 8H Bc1 Page 1 5 RDAG12 8 Manual Pai ISA XTAL WATCHDOG 7 TYPICAL OF EIGHT Sa osc CIRCUIT 7 CURRENT Ll OUTPUT DACS VOLTAGE OPTO Rodas OUTPUT l ISOLATORS if u TYPE ADDRESS GAIN AND DECODE POLARITY Y DS80C310 LOGIC SELECT z ISOPWR ISOLATED g 7 5 24V POWER MICRO z SOGND SUPPLY CONTROLLER POWER 12 16V GND DIGITAL INPUT SRAM EEPROM INTERFACE LATCHES 32K 32K LOGIC OU
36. sued Example Set the Pod to 19200 baud SEND BAUD 555 CR Page 3 8 Manual MRDAG12 8H Bc1 RECEIVE Baud 05 CR Set the Pod to 9600 baud SEND BAUD 333 CR RECEIVE Baud 03 CR Configure Pod Address POD xx Program the currently selected Pod to respond at address xx This command changes the Pod s address to xx If the new address is 00 the Pod will be placed into non addressed mode If the new address is not 00 the Pod will not respond to further communications until a valid address command is issued Hex numbers 00 FF are considered valid addresses The RS485 specification allows only 32 drops on the line so some addresses may be unused The new Pod address is saved in EEPROM and will be used even after power down until the next Pod xx command is issued Note that if the new address is not 00 i e the Pod is configured to be in addressed mode it is necessary to issue an address command to the Pod at the new address before it will respond The Pod returns a message containing the Pod number as confirmation Example Set the Pod address to 01 SEND Pod 01 CR RECEIVE Pod 01 CR Set the Pod address to F3 SEND Pod F3 CR RECEIVE Pod F3 CR Take the Pod out of addressed mode SEND Pod 00 CR RECEIVE Pod 00 CR Address Select Ixx Selects the Pod addressed xx Note When using more than one Pod in a system each Pod is configured with a unique address This command must be issued prior to any ot
37. th AOGND IOUTO 7 4 20mA Current Sink Output signal use in conjunction with an external power supply 5 5V to 30V Page 2 8 Manual MRDAG12 8H Bc1 Voltage Output 5mA maximum DAC Analog Voltage Output Load APPLICATION CARD Excitation Voltage APPLICATION 5 5 30 V maximum Observe Polarity Current Output Load DAC Analog Output Current Sink Ground Figure 2 1 Simplified Schematic for Voltage and Current Sink Outputs Manual MRDAG12 8H Bc1 Page 2 9 Chapter 3 Software General The RDAG12 8 comes with ASCII based software provided on CD ASCII programming permits you to write applications in any high level language that supports ASCII text string functions allowing the REMOTE ACCES series modules to be used with virtually any computer that has an RS485 port The communication protocol has two forms addressed and non addressed Non addressed protocol is used when only one REMOTE ACCES Pod is to be used Addressed protocol must be used when more than one REMOTE ACCES Pod is to be used The difference is that an address command is sent to enable the specific Pod The address command is only sent once during communication between the specific Pod and the host computer It enables communication with that specific Pod and disables all other REMOTE ACCES devices on the network Command Structure All communication must be 7 data bits even parity 1 stop bit All numbers sent to and
38. tion program designed for RS422 485 operation Used primarily with Remote Data Acquisition Pods and our RS422 485 serial communication product line Can be used to say hello to an installed modem ACCES32 This directory contains the Windows 95 98 NT driver used to provide access to the hardware registers when writing 32 bit Windows software Several samples are provided in a variety of languages to demonstrate how to use this driver The DLL provides four functions InPortB OutPortB InPort and OutPort to access the hardware This directory also contains the device driver for Windows NT ACCESNT SYS This device driver provides register level hardware access in Windows NT Two methods of using the driver are available through ACCES32 DLL recommended and through the DevicelOControl handles provided by ACCESNT SYS slightly faster Manual MRDAG12 8H Bc1 Page 2 1 RDAG12 8 Manual SAMPLES Samples for using ACCES32 DLL are provided in this directory Using this DLL not only makes the hardware programming easier MUCH easier but also one source file can be used for both Windows 95 98 and WindowsNT One executable can run under both operating systems and still have full access to the hardware registers The DLL is used exactly like any other DLL so it is compatible with any language capable of using 32 bit DLLs Consult the manuals provided with your language s compiler for information on using DLLs in your specific environment VBACCES T
39. ut ports Each port can be individually programmed as an input or an output Digital input ports can accept logic high input voltages up to 50V and are overvoltage protected to 200 VDC Output drivers are open collector and can comply with up to 50 VDC of user supplied voltage Each output port can sink up to 350 mA but total sink current is limited to a cumulative total of 650 mA for all seven bits Watchdog Timer The built in watchdog timer resets the Pod if the microcontroller hangs up or the power supply voltage drops below 7 5 VDC The microcontroller may also be reset by an external manual pushbutton connected to PBRST pin 41 of the interface connector Page 1 2 Manual MRDAG12 8H Bc1 Specifications Serial Communications Interface e Serial Port Opto isolated Matlabs type LTC491 Transmitter Receiver Compatible with RS485 specification Up to 32 drivers and receivers allowed on the line I O bus programmable from 00 to FF hex 0 to 255 decimal Whatever address is assigned is stored in EEPROM and used as default at next Power On e Asynchronous Data Format 7 data bits even parity one stop bit Input Common Mode Voltage 300V minimum opto isolated If opto isolators are by passed 7V to 12V Receiver Input Sensitivity 200 mV differential input Receiver Input Impedance 12KQ minimum Transmitter Output Drive 60 mA 100 mA short circuit current capability e Serial Data Rates Programmable for 1200
40. x0 dd tt mm 1111 Xxx0 is the desired power on initial state of DAC n dd is the divisor for the output rate 00 lt dd lt FF tt is the number of times to run mm is the polarity and gain select for DAC n mm 00 5V mm 01 0 10V mm 02 0 5V lili is the buffer array entry 000 lt 1111 lt 800h Example To configure DAC 3 to Power on at 8000 counts Use one half the Sxxxx timebase as its buffered output rate Output the Buffer a total of 15 times then stop Page 3 4 Manual MRDAG12 8H Bc1 Use the 5V range Output a buffer a total of 800 hex entries long Use the command AC3 8000 02 0F 00 0800 CR Set Calibration Parameters CALn bbbb mmmm Write span and offset calibration values in two s complement hex as two four digit numbers Example Write a span of 42h and an offset of 36h to DAC 1 SEND CAL1 0036 0042 CR RECEIVE CR Read Calibration Parameters CALn Recalls the scale and offset calibration constants Example Read calibration parameters after the above write SEND CAL1 CR RECEIVE 0036 0042 CR Store Calibration Parameters BACKUP CAL Backup the last calibration This function stores the values required to adjust the measurement readings to agree with the last calibration The setup program will measure and write these calibration parameters The SAMPLE program illustrates using the CALn Command with the results of this function Configure Bits as Input or Output Mxx Configu
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