ISA / PC-104 High Speed Interface User`s Manual
Contents
1. misuse or maintenance mishandling misapplication or damage caused by acts of God 3 You must retain your bill of sale or provide other proof of purchase 4 Any replacement parts furnished at no cost to the purchaser in fulfillment of this warranty are warranted only for the unexpired portion of the original warranty ALL WARRANTIES REQUIRED TO BE IMPLIED BY STATE LAW ARE EXPRESSLY LIMITED TO THE DURATION OF THE LIMITED WARRANTIES SET FORTH ABOVE Some states do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you WITH THE EXCEPTION OF ANY WARRANTIES REQUIRED TO BE IMPLIED BY STATE LAW AS HEREBY LIMITED THE FOREGOING EXPRESS WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES IN NO EVENT SHALL ACUITY BE LIABLE FOR SPECIAL INCIDENTAL CONSEQUENTIAL OR PUNITIVE DAMAGES INCLUDING WITHOUT LIMITATION INJURY OR DAMAGE TO PERSONS OR OTHER PROPERTY INCONVENIENCE LOSS OF GOODWILL LOST PROFITS OR REVENUE LOSS OF USE OF THIS PRODUCT OR ANY ASSOCIATED EQUIPMENT COST OF SUBSTITUTIVE EQUIPMENT DOWNTIME COSTS OR CLAIMS OF ANY PARTY DEALING WITH PURCHASER FOR SUCH DAMAGES RESULTING FROM THE USE OF THIS PRODUCT OR FROM DEFECTS IN THIS PRODUCT OR ARISING FROM BREACH OF WARRANTY OR CONTRACT NEGLIGENCE OR ANY OTHER ISA PC104 HSIF User s Manual Rev 9 03 i Acuity 1 Laer hieasuremiemi LEGAL THEORY Some states do not allow the exclusion or limitation of incidental or conse2. 4000 as described in the Initial Checkout section Acuity 12 Lantr Mieasurememnti lt 1 9 1 Diagnostics Install the ISA EISA High Speed Interface in an ISA bus slot or install the PC 104 board into a PC 104 stack connect the sensor to the interface board and to a serial port on the computer If the sensor s LED does not come on check the connection of the sensor to the interface The serial connection to the sensor may be tested separately using a program such as the Windows terminal to observe sensor output and send commands If the sensor does not respond to serial communications check the serial port connection After installing the board and connecting the AccuRange sensor run the demo diagnostic software supplied with the board following the instructions in the README TXT file with the software If the motor control option is not installed the encoder tests will not succeed If you have not connected the input lines and external sample control line to 0 5 volt signals the tests of those lines will not succeed All other tests should succeed If the one or more of the Interface tests fail check that the port address as selected by J1 ISA EISA model or JMP1 PC 104 model matches the port address you give the diagnostic software Also make sure that no other boards in the computer system are using the address group selected by J1 ISA EISA model or JMP1 PC 104 model Verify that the serial port the sensor is c
3. Connection No Connection 5V Power 100 mA Out 5V Power 100 mA Out Ground Motor 2 Encoder Ch A In Ground Motor 2 Encoder Ch B In Ground Motor 1 Encoder Ch A In Ground Motor 1 Encoder Ch B In Ground No Connection No Connection General Purpose Input 1 Encoder 1 Index Pulse In Start Stop Sample Ctrl In General Purpose Input 3 In General Purpose Input 2 Encoder 2 Index Pulse In P2 I O Connector 1 4 4 P2 Pin Descriptions Pin 1 Motor 2 Control If used motor 2 should be connected between this pin and pin 2 If the pulse width motor control option was ordered ISA EISA model only this pin and pin 2 will drive motor 2 with a 20 KHz pulse width signal as set through software ISA PC104 HSIF User s Manual Rev 9 03 Acuity 4 Laer hieasuremiemi commands If the variable voltage motor control option was ordered the output voltage level is varied as commanded Pin 2 Motor 2 Return If used motor 2 should be connected between this pin and pin 1 Pin 3 Motor Power The external power supply for the motors should be applied to this line at 12 to 48 Volts depending on the motor used The line may draw up to 2 amps Pin 4 No Connection Pin 5 5V power output Primarily intended as power for the motor 1 encoder but it may be used to drive other hardware up to 100 mA maximum Pins 6 10 Ground May be used as ground for encoders or other hardware powered by 5V on pins 5 and 18 Pin 11
4. No Connection Pin 12 Start Stop Sample Control Input When high this input enables sampling and samples will be taken until the on board buffer is full When pulled low sampling will stop Samples are always completed so that a full 8 byte sample is always buffered This line is pulled up with an on board 10Kohm resistor so sampling is enabled when the input 1s left open The first sample following resumption of sampling after stopping the sampling will not contain valid data and must be read and discarded Pin 13 General purpose input bit 2 Motor 2 index pulse input This may be used to sample external signals The value of the bit will is included in the sampled data stream This may be used to sample motor encoder index pulses or other events in order to synchronize the sample data with the event The signal is latched so that any high signal of 500 nanoseconds or longer during a sample interval will appear as a high level in at least one sample If the input is high across a sampling interval boundary it will appear in 2 consecutive samples This is intended for use with encoder index pulses Pin 14 Motor 1 Control If used motor 1 should be connected between this pin and pin 14 If the pulse width motor control option was ordered ISA EISA model only this pin and pin 14 will drive motor with a 20 KHz pulse wath signal as set through software ISA PC104 HSIF User s Manual Rev 9 03 Acuity 5 Laer hieasuremiemi co
5. at up to 1 5 Mhz The encoder positions are converted to 8 bit position values that are included in the data stream Each transition of pins 21 or 22 causes an up or down count in the position so each quadrature cycle is effectively multiplied by 4 for the best possible resolution Pin 22 Motor 1 Encoder Channel B If the motor control option is installed on the board this input is decoded with pin 21 as a quadrature encoder signal from motor 1 The input should be a TTL level signal and may switch at up to 1 5 Mhz Pin 23 No Connection Pin 24 General purpose input bit 1 Motor 1 index pulse input ISA PC104 HSIF User s Manual Rev 9 03 Acuity 6 Laer hieasuremiemi 1 5 ISA PC104 HSIF User s Manual Rev 9 03 This may be used to sample external signals The value of the bit will is included in the sampled data stream This may be used to sample motor encoder index pulses or other events in order to synchronize the sample data with the event The signal is latched high so that any high signal of 500 nanoseconds or longer during a sample interval will appear as a high level in at least one sample If the input is high across a sampling interval boundary it will appear in 2 consecutive samples This is intended for use with encoder index pulses Pin 25 General purpose input bit 3 This may be used to sample external signals The value of the bit will be inverted and inserted into the sample data stream This may be use
6. bit sample of the position of motor encoder 1 if the motor control option is installed and a motor encoder is attached to the P2 motor encoder inputs The position will wrap to 0 after reaching 255 Motor 2 Encoder Position 8 bit sample of the position of motor encoder 2 if the motor control option is installed and a motor encoder is attached to the P2 motor 2 encoder inputs The position will wrap to O after reaching 255 1 7 Interrupt Driven Operation ISA PC104 HSIF Rev 9 03 The interface board may be jumpered to generate an interrupt when the on board data buffer is half full One jumper pair in Jumper J2 may be closed to activate the corresponding interrupt as shown below The interrupt can only be cleared by reading samples until the buffer is less than half full or by issuing a Reset command to the board Jumper Pair Interrupt Enabled ISA EISA PC 104 J2 1 JMP2 6 IRQ3 p2 JMP2 5 IRQ4 J2 3 JMP2 4 IRQ5 J2 4 JMP2 3 IRQ6 J2 5 JMP2 2 IRQ7 J2 6 JMP2 1 IRQ9 ser s Manual J2 Interrupt Enable Jumper 1 8 1 9 ISA PC104 HSIF User s Manual Rev 9 03 Interface Resolution and Sample Rates The resolution for the high speed interface is 33 better than the resolution of the sensor data transmitted over the serial port or current loop and the maximum possible sample rate is much higher since the serial and current loop output rates are limited by the 4000 s on board processor The sample rate and maximum expecte
7. 4000 The 25 pin connector is used for powering the motors and reading the motor encoders general purpose inputs and sample control input 1 4 1 9 Pin Power and Signal Connector P1 a 5 4000 Wire Function Direction Red Power 5V 5 6V Out Black Ground Orange Heater Power 5V 4 5 7V Out Brown Heater Power Return Yellow Temperature 0 5 V In Blue Pulse Width Range Signal In Green Ambient light signal 0 5 V Purple Amplitude signal 0 5 V In l 2 3 4 5 6 7 8 P1 Power and Signal Connector Wiring 1 4 2 Power and Signal Connector Description The line descriptions for P1 are the same as the descriptions of the power and signal lines in the AccuRange 4000 Power and Signal Cable Wire Description section Pins 1 4 supply sensor power and sensor heater power and ground lines The remaining lines are inputs for the signals from the AccuRange 4000 Pins 5 7 and 8 are the inputs for the analog signals with 2K impedance Pin 6 is the input for the pulse width range signal ISA PC104 HSIF User s Manual Rev 9 03 Acuity Lantr Mieasurememnti lt 1 4 3 25 Pin I O Connector P2 P2 includes general purpose input lines a sample start stop control line quadrature encoder input lines and power for encoders or other applications Top Row Bottom Row Function Direction Pin Function Direction Motor 2 Control Out Motor 1 Control Out Motor 2 Return Out Motor Power Ground Motor Power Supply In Motor 1 Return No
8. ce at their own expense Copyright 2003 Acuity a division of Schmitt Measurement Systems Inc ISA PC104 HSIF User s Manual Rev 9 03 ee Acuity 111 Laer hieasuremiemi TABLE OF CONTENTS 1 ACCURANGE ISA AND PC104 HIGH SPEED INTERFACE CARDS 1 1 1 General Description 1 1 2 Sensor Configuration and Sample Rate 2 1 3 Motor Power 2 1 4 H O Connectors 3 1 4 1 9 Pin Power and Signal Connector P1 3 1 4 2 Power and Signal Connector Description 3 1 4 3 25 Pin I O Connector P2 4 1 4 4 P2 Pin Descriptions 4 1 5 I O Port Interface 7 1 5 1 Port Descriptions 8 1 6 Sampled Data Format 9 1 6 1 Description of Sampled Data Format 10 1 7 Interrupt Driven Operation 11 1 8 Interface Resolution and Sample Rates 12 1 9 Interface Installation and Checkout 12 1 9 1 Diagnostics 13 1 10 High Speed Interface Data Sheet 13 ISA PC104 HSIF User s Manual Rev 9 03 Acuity Laer hieasuremiemi 1 AccuRange ISA and PC104 High Speed Interface Cards 1 1 General Description The AccuRange High Speed Interface is an interface board that takes samples from the AccuRange 4000 optical rangefinder Two models are available One model plugs into an IBM PC or compatible ISA or EISA bus The other model is PC 104 compatible Samples come over the bus in an 8 byte format that includes a 19 bit range value and byte values for signal strength ambient light and sensor internal temperature as well as status and general purpose input bits These nputs along w
9. cuit Laser Measurement AccuRange High Speed Interface ISA and PC 104 Formats User s Manual Rev 2 5 For use with AccuRange HSIF ISA and PC104 September 5 2003 Acuity A division of Schmitt Measurement Systems Inc 2765 NW Nicolai St Portland OR 97210 www acuityresearch com ISA PC104 HSIF User s Manual A Rev 9 03 i cuity 1 CE La arer Misasurememi Limited Warranty Acuity a division of Schmitt Measurement Systems Inc makes the following limited warranties These limited warranties extend to the original purchaser and to no other purchaser or transferee Limited One Year Parts and Labor Warranty Acuity warrants this product and its parts against defects in materials or workmanship for a period of one year after the date of original retail purchase During this period Acuity will at its option repair or replace a defective product or part without charge to you Warranty Conditions The above LIMITED WARRANTIES are subject to the following conditions 1 Warranties extend only to products manufactured by Acuity 2 Warranties extend only to defects in materials or workmanship as limited above Warranties extend only to defects which occur during normal use and do not extend to damage to products or parts which results from alteration repair modification faulty installation or service by anyone other than an authorized Acuity service center damage to products or parts caused by accident abuse
10. d range should be set as described earlier in this manual At relatively low sample rates the 4000 sets a higher internal rate and averages multiple samples for best resolution Since the high speed interface sample rate is the same as this internal rate setting a combination of low sample rate and short maximum range will result in a higher than expected high speed interface sample rate The slowest sample period with a max range setting of 650 inches is about 2250 microseconds or 440 Hz and rises to 5 4 Khz 185 microseconds with a max range setting of 1 inch To obtain a lower sample rate set the max range to a larger value and then set the sample rate desired or for best accuracy sample at the higher rate and average multiple samples in software Maximum Attainable Sample Rates samples second Resolution Range inches 6 Feet 30 Feet 50 Feet 0047 0094 0188 0375 0750 1500 3000 6000 2304 4609 9218 18346 36873 50000 50000 50000 677 1355 2 11 9422 10845 21691 43382 90000 Interface Installation and Checkout 390 781 1562 3125 6250 12500 25000 90000 After selecting a port address base that does not conflict with other peripheral cards in your computer install the ISA EISA board in any PC ISA or EISA slot or install the PC 104 board into a PC 104 stack Attach the AccuRange 4000 Power and Signal cable to the 9 pin connector Turn on the computer power Check out the operation of the AccuRange
11. d to sample events in order to synchronize the sample data with the event Note the bit is INVERTED and NOT LATCHED so if the event does not last for at least one sample interval it may be missed I O Port Interface The High Speed Interface is accessed as a set of I O ports on the ISA or PC 104 bus The board occupies a group of 8 contiguous port address locations starting at the address determined by the port address jumper J1 Jumpers Address ISA EISA Model J1 4 J1 3 PC 104 Model JMP 4 JMP 3 off off OOOHex off off 040Hex off off OSOHex off off OCOHex off on 100Hex off on 140Hex off on 180Hex off on 1COHex on off 200Hex Default on off 240Hex on off 280Hex on off on 2COHex on on off 300Hex on on 340Hex on on on 380Hex on on on on 3COHex Port Address Base Jumper Map Acuity 7 Lantr Mcacuremcnt lt Within the 8 byte address space occupied by the board locations 0 3 are used They are addressed as offsets from the base address selected by the jumpers For example if address 280 Hex is selected as the base the port addresses for the board are 280H 281H 282H and 283H Any one of 16 locations between 0 Hex and 3CO Hex may be selected for the port base Choose a location from the table below that does not interfere with other peripherals in your system Offset from Base Address Access Function Read Write Read Sample Data Write Send Command Read Only Buffer Status Write Only Motor Power and Direction W
12. escription of the 25 pin I O connector for encoder connection details If motors are to be driven by the power amplifier on the board the motors and motor power must be connected to P2 Motor should be connected between pins 14 and 16 and motor 2 between pins 1 and 2 A separate power supply is required to drive the motors Connect the motor power supply to pin 3 and the power supply ground to pin 15 The ISA EISA model Motor control can be ordered in either of 2 configurations The first is pulse width modulation and is suitable for driving D C brush motors ISA PC104 HSIF User s Manual Rev 9 03 Acuity 2 Laer hieasuremiemi at up to 2 amps at 48 volts The other configuration is variable voltage control and is suitable for small motors and brushless D C motors with embedded electronics and steady state power levels up to 5 watts 36 Volts max per motor Pulse width modulation tends to be more power efficient while variable voltage control is suitable for smaller motors or brushless motors With pulse width control motor direction can be reversed by switching the motor connections or through software control of the motor power There is no software direction control with variable voltage control The PC 104 model is available in only the variable voltage control configuration 1 4 IVO Connectors There are 2 connectors on the High Speed Interface The 9 pin connector supplies power and receives signals from the AccuRange
13. ith external enable disable control of sampling allow precise synchronization with external events The ISA EISA board has an IBM PC form factor and will fit in a half length PC ISA slot The PC 104 board conforms to the PC 104 specification for a 16 bit stackthrough module Data is transferred over an 8 bit I O port with the address selected with on board jumpers The interface board operates by measuring the range dependent pulse width output of the AccuRange 4000 To use the 4000 with the High Speed Interface the Current Loop option must not be installed in the sensor Each pulse on the pulse width output is timed on the Interface board by a timer with a clock rate of 80 MHz The sample rate of the interface is therefore controlled by the sample rate for which the 4000 is configured Since the pulse width output can be set to repeat at up to 50 KHz that is the maximum sample rate of the interface The data collected by the high speed interface is not scaled or calibrated in any way It can be used to create calibrated distance output using software modules and tables supplied with the interface or though user written algorithms The data can be used to calculate distance as each sample is collected although the more typical application will collect a batch of samples and create distance readings from the entire group after high speed collection is finished Other features of the interface include memory buffer empty half full and overflo
14. iver configuration ISA EISA model only The direction bit has no effect if the board is configured with variable voltage motor drivers Port 3 The base address 3 is a write only port The lower 6 bits of the byte written are the power level for motor 2 A value of 0 is off and 63 is full power Bit 6 is unused The high bit bit 7 is the direction which is effective only with the pulse width motor driver configuration ISA EISA model only The direction bit has no effect if the board is configured with variable voltage motor drivers 1 6 Sampled Data Format The interface board collects 8 bytes sample in a sequential stream Reading from the port at offset O will read the next byte in the data stream if it is available See I O Interface section above When reading from the board multiples of 8 bytes should be read to ensure that a complete sample is obtained If memory buffer overflow occurs the board will always drop complete samples so that synchronization is not lost If a software board reset command is issued the next ISA PC104 HSIF User s Manual Rev 9 03 Acuity 9 Laer ilcacurenie ml byte read will be the first byte of a complete sample and unread and partially read samples will be lost In general the values for amplitude and ambient light level will correspond closely to the values from the 4000 s serial interface with the ASCII format serial data being 4 times the High Speed Interface values for amplitude and a
15. lows Clear Buffer Overflow Flag Writing a byte with bits 0 and 1 clear will clear the buffer overflow flag in the data stream See the Sampled Data Format section for further description of this flag Board Reset Writing a byte to port O with bits O and 1 set resets the interface board This clears the buffer overflow flag and empties the data buffer The next byte following a reset will be the first byte of an 8 byte sample The first sample following a Reset will not contain reliable data so it should be read and discarded The Reset command also clears the encoder counters resetting them to 0 Port 1 The base address 1 is a read only port Only the lower 2 bits have meaning If bit O is clear there is no data available at port 0 for reading Reading port O should be avoided until port 1 bit O reads as 1 since the byte read may or may not be a valid data byte The next byte could arrive in the buffer between reading the status byte and reading the data byte Port 1 bit 1 is a half full status bit If this bit is set a stream of bytes equal to half the length of the buffer may be read without checking the status port Standard buffer sizes are 2K bytes and 16K bytes Port 2 The base address 2 is a write only port The lower 6 bits of the byte written are the power level for motor 1 A value of 0 is off and 63 is full power Bit 6 is unused The high bit bit 7 is the direction which is effective only with the pulse width motor dr
16. mbient light However the values will not match exactly and the calibration software supplied for use with the High Speed Interface must be used with the values obtained from the High Speed Interface not serial data The temperature and range have different scale factors from the serial data and must be scaled using algorithms found in the software supplied with the interface Amplitude Sample Ambient Light Sample Internal Temperature Bits 7 5 3 Least significant bits of range bits O 1 2 Bit 4 Always Zero Bit 3 Data Lost Buffer Overflow Bit 2 Input 3 Bit 1 Input 2 Motor 2 Index Bit 0 Input 1 Motor 1 Index Range bits 3 10 Range bits 11 18 Motor 1 Encoder Position Motor 2 Encoder Position Sampled Data Format 1 6 1 Description of Sampled Data Format Amplitude 8 bit sample of the AccuRange logarithmic signal strength output The sample represents the amplitude of the modulated signal sensed by the detector The amplitude sample is taken in the first 10 microseconds of the data sample interval Ambient Light 8 bit sample of the AccuRange ambient light output The sample represents the ambient or background light sensed by the detector It will also register the light transmitted by the sensor so changing range signal ISA PC104 HSIF User s Manual Rev 9 03 o Acuity Lantr hMieasurememnmti lt strengths will affect this reading somewhat The ambient light sample is taken in the first 10 microseconds
17. mmands If the variable voltage motor control option was ordered the output voltage level is varied as commanded Pin 15 Motor Power Ground The external power supply ground for the motors should be connected to this pin Pin 16 Motor Ground If used motor 2 should be connected between this pin and pin 16 Pin 17 No Connection Pin 18 5V power Primarily intended as power for the motor 2 encoder but it may be used to drive other hardware up to 100 milliamps maximum Pin 19 Motor 2 Encoder Channel A If the motor control option is installed on the board this input is decoded with pin 20 as a quadrature encoder signal from motor 2 The input should be a TTL level signal and may switch at up to 1 5 Mhz The encoder positions are converted to 8 bit position values that ate included in the data stream Each transition of pins 19 or 20 causes an up or down count in the position so each quadrature cycle is effectively multiplied by 4 for the best possible resolution Pin 20 Motor 2 Encoder Channel B If the motor control option is installed on the board this input is decoded with pin 19 as a quadrature encoder signal from motor 2 The input should be a TTL level signal and may switch at up to 1 5 Mhz Pin 21 Motor 1 Encoder Channel A If the motor control option is installed on the board this input is decoded with pin 22 as a quadrature encoder signal from motor The input should be a TTL level signal and may switch
18. nd therefore the pulse width output of the sensor can operate is 31 samples per second 32 milliseconds per sample Setting lower sample rates will not reduce the pulse width output frequency or the sample rate of the Interface To obtain the slowest possible sample rate from the High Speed Interface and the maximum resolution per sample use the serial interface to configure the 4000 for a maximum expected range of 9950 inches and then set the sample rate Setting the maximum range to shorter distances including the default setting may cause the pulse width to repeat at higher frequencies than the sample rate set depending on the maximum expected range and sample rate specified For short maximum range settings the pulse frequency will be about 5 Khz for sample rates below that The maximum sample rate is 50 000 samples per second 20 microseconds sample 1 3 Motor Power The AccuRange High Speed Interface can be ordered with two motor power control and encoder reading channels Each motor may be set to one of 64 software controlled power levels via commands to the board If the motors have encoders which are connected to the encoder inputs two amp bit values from the encoders are decoded and inserted into the data stream giving the position of each motor modulo 256 If the encoders provide index pulses these can be applied to two of the general purpose input lines and used to determine the absolute positions of the motors See the d
19. of the data sample interval Internal temperature 8 bit sample of the AccuRange internal temperature The temperature is sampled in the first 10 microseconds of the data sample interval Range 19 bit value proportional to the distance to the object being ranged within the uncalibrated linearity of the AccuRange 4000 The lowest 3 bits appear in sample byte 3 and the upper 16 bits in bytes 4 and 5 Buffer overflow indicator 1 bit indicating whether a memory buffer overflow occurred and or more samples were lost just prior to the first sample in which the flag is set Once an overflow occurs this bit will stay set until a Reset Buffer Overflow Flag or Reset Interface Board command is given or a power cycle occurs Samples with the overflow flag set may contain inaccurate range data and should be discarded Since the overflow flag is stored with the buffered data resetting the flag will not become evident in the data until the data in the buffer has been read or the buffer has been cleared with a board reset command Note that if the buffer is full when the Reset Buffer Overflow Flag command is given it will simply be set again immediately Inputs 1 2 3 3 general purpose input lines CMOS logic levels These may be used to determine the exact times of external events relative to the samples taken Inputs and 2 are latched high Input 3 is inverting and not latched See the Pin Descriptions for more detail Motor 1 Encoder Position 8
20. onnected to is the port number you give the diagnostic software Check that the sensor s serial port is configured for 9600 baud If the sensor stability tests fail check that the laser comes on during those tests and that the sensor is pointed a white target 1 to 2 yards from the sensor 1 10 High Speed Interface Data Sheet Download the latest datasheet at http www acuityresearch com products ar4000 options accessories high speed interface shtml ISA PC104 HSIF User s Manual Rev 9 03 Acuity 13 Laer hieasuremiemi
21. quential damages so the above limitation may not apply to you Procedures for Obtaining Warranty Service 1 Contact your Acuity distributor or call Acuity to obtain a return merchandise authorization RMA number within the applicable warranty period Acuity will not accept any returned product without an RMA number 2 Ship the product to Acuity postage prepaid together with your bill of sale or other proof of purchase your name address description of the problem s Print the RMA number you have obtained on the outside of the package This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Note This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this device in a residential area is likely to cause harmful interference in which case the user will be required to correct the interferen
22. rite Only Motor 2 Power and Direction Repeat Functions of ports 0 3 I O Port Address Map 1 5 1 Port Descriptions Read Sensor Data see Sampled Data Format Section Write Command value 0 Clear Buffer Full Flag 3 Reset Board Read Buffer Status Bit 0 0 No data available Bit 0 1 Data available Bit 1 0 Buffer Less Than Half Full Bit 1 1 Buffer At Least Half Full Port 2 Data Write Bits 0 5 Motor 1 Power Level Bit 7 Motor Direction Port 3 Data Write Bits 0 5 Motor 2 Power Level Bit 7 Motor 2 Direction I O Port Data Definition Port 0 The base address O is a read write port When read it gives the next byte in the data stream If the memory buffer is empty this byte will be meaningless It is not possible to tell from the data content whether the byte is valid data or not There are 2 possible ways to determine whether the data is good Bit O of the status port offset 1 may be read and tested A 1 indicates that the next byte read from the data port will be valid data The other method is to test bit 1 of the status ISA PC104 HSIF User s Manual Rev 9 03 Acuity 8 Laer hieasuremiemi port A 1 here indicates that the buffer is half full A group of bytes half the size of the buffer may then be read before there is any danger of the buffer being empty Writing to port 0 sends a command to the board The command code is contained in the lower 2 bits of the byte written The 2 commands are as fol
23. w status indicators external sample start stop control and three general purpose input bits that allow synchronous recording of events while sampling The board can also be ordered with power control circuitry for two small motors This is not full servo control but it allows motor power to be programmed If the motors have encoders the encoders may be sampled with the sensor data to provide position information in the sample stream in scanning systems Each motor can be driven with up to 2 amps at 12 to 48 volts Power for the motors must be supplied to the board where it is pulse width modulated ISA EISA model only or DC level controlled depending on the configuration ordered according to the programmed power level ISA PC104 HSIF User s Manual Rev 9 03 Acuity Laer hieasuremiemi 1 2 Sensor Configuration and Sample Rate When using the High Speed Interface all configuration of the 4000 is done via the serial port or push button interface just as it would be when using the sensor without the High Speed Interface The communication path from the 4000 to the High Speed Interface is a one way data path only the sensor cannot be configured through the Interface Since the sample rate of the Interface is controlled by the rate of the pulse width output of the 4000 using the Set Sample Interval command over the serial port will set the sample rate for the Interface with one limitation The lowest rate at which the internal sampling a
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