Model: ADC-x/DIG-x
Contents
1. Analog offset calibration 2 s complement integer offset to be added to analog bipolar sample Continuous Analog configuration count 0x00 No analog stream readings 0x01 0x08 Number of analog queries See Modes of Operation Stream Continuous for locations 0x10 0x1A Analog Query 1 control byte analog control nibble Analog Query 2 control byte analog control nibble Analog Query 3 control byte analog control nibble Analog Query 4 control byte analog control nibble Analog Query 5 control byte analog control nibble Analog Query 6 control byte analog control nibble Analog Query 7 control byte analog control nibble Analog Query 8 control byte analog control nibble Continuous Digital Input configuration 0x00 Digital Input status OFF 0x01 Digital Input status ON Continuous Pulse Counter configuration 0x00 Pulse Counter status OFF 0x01 Pulse Counter status ON Ox1B OXFF Available to User SuperLogics ADC DIG User s Manual Modes of Operation General The SuperLogics RS 232 I O modules can operate in three communications modes Polled Timed Async and Continuous These modes of operation can be used singularly or together in combination Interface RS 485 and RS 232 RS 485 and RS 232 Continuous RS 232 Polled Mode By far the Polled Mode is the most common usage of the ADC x and DIG x I O modules In this mode the2. Model ADC x DIG x RS 232 RS 485 Data Acquisition Digital 1 O v2 2 Firmware SuperLogics SuperLogics 94 Falmouth Road Newton MA 02465 USA Phone 617 332 3627 Fax 617 332 4687 Web www SuperLogics com SuperLogics ADC DIG User s Manual Table of Contents Introduction I O Module features Quick Start using Windows Hyperterminal Communications RS 485 and RS 232 Packet Description Commands and Responses Command amp Response Table Command amp Response Examples RS 232 Interface Command amp Response Examples RS 485 Interface Analog Control Nibble Module Configuration DIP Switch and Jumpers EEPROM Map Modes of Operation Polled Mode Timed Async Mode Continuous Mode PCB Details Board Illustration IC Description amp LED Operation Connector Pinouts Digital amp Analog Pinout Power amp Communications Pinout RS 232 Cabling Digtial I O Technical Info Digital I O Specifications and Control Analog Input Technical Info Analog Specifications Voltage References amp Charge Pump Resistor Analog Voltage Sampling amp Conversion Analog Current Sampling amp Conversion SuperLogics ADC DIG User s Manual Introduction Features Welcome to the wonderful world of SuperLogics I O modules We offer two different types of I O module lines ADC x and DIG x Each module is available with two different serial interface types RS 232 and RS 485 All modules use exactly the same
3. 1 LM4040AIZ 4 1 ND voltage range 4 1Vdc to 4 1Vdc 1 0 LM4040DIZ 4 1 ND 0 1 LM4040AIZ 2 5 ND 1 0 LM4040DIZ 2 5 ND 1 200V 0 5 LM4041ClZ 1 2 ND voltage range 1 2Vdc to 1 2Vdc Charge Pump Resistor The ADC x module contains a negative voltage supply in the form of a charge pump driven by U8 an LMC555 timer This charge pump obtains its voltage from the unregulated power supply input Since the LMC555 is rated only for 15Vdc we have designed a simple zener diode power supply fed through R18 to regulate the power into the LMC555 to 12Vdc If the power supply voltage gt 17Vdc R18 needs to be replaced with a 1 2K resistor SuperLogics ADC DI G User s Manual Analog Input Technical Info Charge Pump Resistor cont We supply a 1 2K 1 2W resistor with each ADC x module Power supply Voltage R18 Value 7 5Vdc to 17 0Vdc 120 ohm 1 4W factory default 17 1Vdc to 30Vdc 1 2K ohm 1 2W supplied not installed Sampling Analog Voltage Inputs By far the most common configuration of the ADC x is to sample voltage values Analog voltage levels are converted to integer digital values using the Linear Technologies LTC1296 A D Analog Digital chip The input voltage range is determined by the reference voltage There are two analog sample types Unipolar and Bipolar Both A D sampling types result in a 12 bit binary integer value This binary integer value is converterd to a voltage depending on the sample t
4. Digital Counter or Analog readings RS 232 Command Format Command Response CR ASCII carriage return 13 0x0D hex RS 485 Interface RS 485 operates Half Duplex Each module node on the bus has a unique Address 1 to 254 0x01 OxFE hex We use the latest Linear Technologies RS 485 bus drivers LTC1487 allowing up to 255 nodes on the RS 485 multi drop bus Address 0 0x00 hex is reserved for the Host controller Address 255 OxFF hex is reserved for Broadcast messages accepted by all modules on the RS 485 bus RS 485 Packet Format Destination Address Source Address Command Response CR XX XX ASCII carriage return 13 0x0D hex x ASCII Hexadecimal Address 0x00 Host Device IBM PC micro controller etc Address 0x01 0xFE 1 0 Module Address Address 0xFF Broadcast Address used to configure an I O Module SuperLogics ADC DIG User s Manual Firmware v2 2 Command Response Command and Response The following table illustrates the SuperLogics I O module commands and responses NOTE All numeric data is represent as ASCII Hexadecimal integers value x y in the table If a module receives an illegal or improperly formatted command Error Response is sent All ASCII characters are CASE SENSITIVE use all capital letters Command Response Description Sent by Host Sent by I O Module Vxy Firmware version x y Ixxyy Input digital port status xx PORT PORTB yy PORT2 PORTD Also r
5. Hexadecimal integers The symbol J equates to a carriage return decimal 13 hex 0x0D Host Command Module Response Action P0000J PJ PWM off Any duty cycle of 0 disables PWM output P08004 1 PJ PWM frequency 51200 Hz PWM duty 12 5 PFE3FFJ P PWM frequency 1807 Hz PWM duty 100 PFE200J PJ PWM frequency 1807 Hz PWM duty 50 SuperLogics ADC DI G User s Manual Analog Input Technical Info Analog Characteristics Characteristic Value A D Converter Linear Tech LTC1296BCN 5LSB Linear Tech LTC1296DCN 2LSB Linearity Error Models ADC 1 2 5 6 LTC1296BCN 0 012 Models ADC 3 4 7 8 LTC1296DCN 0 018 Gain Error Models ADC 1 2 5 6 0 012 5 LSB Models ADC 3 4 7 8 0 39 4 LSB Offset Error Models ADC 1 2 5 6 0 17 Models ADC 3 4 7 8 1 17 Temperature Drift 100 ppm C max Max Input Voltage 70V over voltage protected R17 10K DIP 15V over voltage protected R17 1K DIP Bandwidth gt 1500 SPS max in continuous mode Voltage References We utilize two distinct voltage references in the ADC x Module a 0 1 voltage reference and a 1 0 voltage reference These voltage references may be changed by the user We have included Digikey part numbers for easy ordering Digikey phone 1 800 344 4539 Digikey Part Number 0 1 LM4040AIZ 5 0 ND voltage range 5 0Vdc to 5 0Vdc 1 0 LM4040DIZ 5 0 ND 4 096V 0
6. commands RS 232 e Type letter V and the Enter Key e You should see V22 on the screen RS485 e Type letters 0100V and the Enter Key e You should see 0001 V22 on the screen z Integrity HyperTerminal File Edit View Call Transfer Help oel ols ael gj Integrity Properties Phone Number Settings ASCII Setup Function arrow and ctrl keys act as rr ASCII Sending Terminalkeys Windows keys IT Send line ends with line feeds Emulation Line delay fo milliseconds Auto detect Terminal Setup Character delay fo milliseconds Backscroll buffer lines 500 z m ASCII Receiving M Beep three times when connecting or disconnecting v Append line feeds to incoming line ends M Force incoming data to 7 bit ASCII IV Wrap lines that exceed terminal width ASCII Setup Cancel Connected 0 01 47 Auto detect Auto detect SCROLL CAPS NUM Capture Print echo SuperLogics ADC DIG User s Manual Communications The SuperLogics models ADC x and DIG x support both RS 232 and RS 485 communications interfaces Each interface type uses simple ASCII commands A carriage return decimal code 13 or Hex code 0x0D marks the end of a data packet RS 232 Interface e RS 232 operates Full Duplex e RS 232 modules can enter Continuous mode whereby the module is configured via EEPROM settings to continuously communicate with the host computer to output its current
7. 00 and Module Address 0x13 The symbol J equates to a carriage return decimal 13 hex 0x0D Command Sent by Host Response Sent by I O Module Description 1300V J 0013V 20 1 Module Firmware version 2 0 130014 0013IFFOOJ Input digital port PORTI bits0 7 ON PORT2 bits0 7 OFF Note this command also returns the current digital output 13000007F 001304 Output digital port PORT1 bits 0 7 OFF PORT2 bit 7 OFF bits 0 6 ON 1300TFF80 0013TH Set digital direction PORT1 bits 0 7 INPUT PORT2 bit 7 INPUT bits 0 6 OUTPUT 1300GH 0013GFF804 Get current digital direction PORT 1 bits 0 7 INPUT PORT2 bit 7 INPUT bits 0 6 OUTPUT 1300N4 0013N0003 Get pulse counter Current count 3 1300M 0013M Clear pulse counter Current count 0 1300Q14 0013Q100FH Bipolar analog control nibble 0x1 Analog reading Ox00F 1300U8H 0013U840FI Unipolar analog control nibble 0x8 Analog reading 0x40F 1300K 0013K00 Current receive errors 0 1300J 0013JJ Clear receive error count Current receive errors 0 1300P08004 0013P PWM freq 51200 Hz PWM duty 12 5 1300W0410J 0013W Write EEPROM Address 0x04 with value 0x10 1300R 04 1 0013R 10 1 Read EEPROM Adress 0x04 value is 0x10 1300SH 0013 XK START stream continuous mode Illegal in RS 485 Mode 1300H 0013X HALT stream c
8. 2 Unipolar sample CH2 EEPROM Location 0x1A 0x01 Pulse Counter Status enabled SuperLogics ADC DI G User s Manual Modes of Operation Stream Mode Example cont The following table illustrates the Host Command and 1 O Module responses for the stream conrtinuous example configuration and usage EEPROM Location 0x10 0x02 Take 2 Analog samples EEPROM Location 0x11 0x08 Sample 1 Bipolar sample CHO EEPROM Location 0x12 0x89 Sample 2 Unipolar sample CH1 EEPROM Location 0x1A 0x01 Counter Status enabled NOTE All numeric data is represent as ASCII Hexadecimal integers The symbol J equates to a carriage return decimal 13 hex 0x0D 1 O Module Sends W W W W SJ Continuous mode started 8023 U9823J N0044 180241 U9823J N0044 repeats continually HJ Continuous mode halted The HOST may send any command during the Continuous mode and it will be accepted and processed by the I O Module as in normal operation NOTE Engaging the Continuous mode at a high baud rate 115 2K baud may overwhelm certain Host computer systems due to the high volume of data transmitted on the RS 232 link The is especially true of slower 386 or 486 based systems running Windows 95 with limited SuperLogics ADC DIG User s Manual PCB Details DIP switch Digital I O IC Description U1 PIC16C65 MPU 44 pin PLCC LTC1487 RS 485 driver 8 pin DIP MAX202 RS 232 driver 16 pin DIP 25C040 E
9. 6 CH3 CH5 CH2 CH4 CH2 CH3 CH1 CH2 CH1 CH1 CHO CHO CH0 DIP switch O O O O O O O O O Power Supply 7 5 30Vdc approx 50 ma we suggest a 12Vdc 250ma power supply NOTE Voltage supplies gt 17Vdc must alter R18 charge pump resistor value GND and Shield The GND and Shield terminals are connected on the ADC x DIG x board and are therefore electrically equivalent RS 485 Cabling RS 485 wiring is quite simple Connect all node A signals together and all node B signals together Simply run a twisted pair wire to all nodes Please note that some systems may denote signal A as T R and signal B as T R RS 485 Termination The two nodes units at the extreme ends of the cable must be terminated JP1 amp JP2 installed Ensure that only two nodes maximum are terminated SuperLogics ADC DIG User s Manual Connector Pinout RS 232 Cabling The RS 232 interface uses a 3 wire RS 232 connection That is to say only three wires are connected between the I O Module and the Host PC TxD RxD and SHD DIP switch RS 232 Hardware Flow Control Some RS 232 interfaces may require certain control signals to be wired loopback in order to support various Hardware Flow control schemes If your Host PC or Controller is using Hardware Flow control for serial communications then use the following chart to loopback the control signals RTS CTS DB25 pins 5 4 wired together DB9 pins 8 7 wired together DS
10. EPROM 8 pin DIP LTC1296 20 pin DIP LM4040 Voltage Reference LMC555 Timer charge pump 8 pin DIP Charge pump power supply resistor NOTE U2 and U3 are mutually exclusive LED Operation Blinking Green 1 per Second Unit functioning correctly Blinking Green Rapid or Steady Unit receiving serial data Blinking Red Rapid or Steady Unit transmitting serial data No LED Unit is not functioning Jumpers JP1 JP2 Installed RS 485 active termination at unit JP3 JP4 Not used SuperLogics ADC DIG User s Manual Connector Pinout DB25 Digital 1 0 Port DB25 Digital Port pinout oO UJ N o I 5 Description Port 2 bit 0 PIC PORTD 0 Port 2 bit 1 PIC PORTD 1 Port 2 bit 2 PIC PORTD 2 Port 2 bit 3 PIC PORTD 3 Port 2 bit 4 PIC PORTD 4 Port 2 bit 5 PIC PORTD 5 Port 2 bit 6 PIC PORTD 6 Port 2 bit 7 PIC PORTD 7 PWM output N A V_Unreg 5Vdc GND Port 1 bit 0 OISTIOAIBROINDNH PIC PORTB 0 Port 1 bit 1 PIC PORTB 1 Port 1 bit 2 PIC PORTB 2 Port 1 bit 3 PIC PORTB 3 Port 1 bit 4 PIC PORTB 4 Port 1 bit 5 PIC PORTB 5 Port 1 bit 6 PIC PORTB 6 Port 1 bit 7 PIC PORTB 7 Pulse Counter Input 5Vdc 5Vdc GND SuperLogics ADC DIG User s Manual Connector Pinout shield g RS 485 RxD RS 232 A RS 485 TxD RS 232 GND GND CH7 CH3 CH
11. F Bipolar Q sample differential CH0 CH1 Control 0 Analog sample 0x00F decimal 15 UAJ UA123J Unipolar U sample CH4 Control A Analog sample 0x123 decimal 291 SuperLogics ADC DIG User s Manual Module DIP Switch amp Jumper Configuration DIP switch settings DIP switch position 9600 baud 19200 baud 57600 baud 115200 baud RS 232 packet No packet addressing RS 485 packet Packet addressing used RS 485 Fast response RS 485 Delayed response Wait approx 2 ms to send response NOTE Use RS 485 delayed response when using the 485 25E protocol converter Jumper settings Jumper RS 485 active bus termination No RS 485 bus termination Not Used Not Used SuperLogics ADC DI G User s Manual EEPROM Map Module Configuration Address Description Module Address RS 485 address factory default 0x01 Timed Async Destination Address factory default 0x00 Data Direction Port 1 PIC16C65 PORTB Bit set 1 Input Bit clear 0 Output factory default 0xFF Data Direction Port 2 PIC16C65 PORTD Bit set 1 Input Bit clear 0 Output factory default 0xFF Timed Async Update Configuration 0x00 No Timed Async updates 0x01 Change Update on Digital Input or Counter change 0x02 0xFF Timed Update Time Value 100 milliseconds factory default 0x00 Reserved
12. F sched SW2 ON RS 232 or OFF RS 485 l SW3 ON Fy Integrity SW4 OFF Enter details for the phone number that you want to dial Launch the H perTerminal t rogram Country code United States of America 1 The HyperTerminal program is found under the Programs Accessories folder Double click on the Area code 218 Hypertrm exe icon to launch the program Basraa gt HyperTerminal program configuration Connect using u s Robotics 56K FAX INT 1 Create a new connection named Integrity U S Robotics 56K FAX INT 2 Select your Comport COM2 in the example aE EREE 3 Set COM Properties 19200 baud 8 data bits Direct to Com 2 No parity 1 stop bit Flow control None COM2 Properties Fort Settings Connection Description a5 New Connection Bits per second 1200 I Enter a name and choose an icon for the connection Data bits s z Name Integrity Parity None Stop bits fi Elow control None L Cancel i Bi Restore Defaults SuperLogics ADC DIG User s Manual Quick Start HyperTerminal program configuration cont 4 Under the File menu select Properties click on the Settings tab and adjust the ASCII Setup settings for Echo typed characters locally and Append line feeds to incoming line ends Your First Command Now that you have a HyperTerminal session running you can start typing After your first command see Commands and Responses section for more
13. Host computer sends a command to the I O Modules which in turn sends an associated response back to the Host computer 1 H HOST Command Sent by Host VO Module computer 2 Response Sent by Module SE Timed Async Mode Timed Async Mode refers to the I O Module sending data without the Host sending a command to poll the I O Module This can be viewed as the I O Module sending a Response without the Host first sending a Command Async mode reduces communications bus traffic NOTE Timed Async mode is configured using EEPROM location 0x04 Value at EEPROM Location 0x04 Timed Async Mode disabled Change Update Digital Input or Pulse Counter change 0x02 0xFF Timed Update decimal 2 255 Time Value 1 second Range 2 second 25 5 seconds SuperLogics ADC DI G User s Manual Modes of Operation Timed Async Mode Change Update When EEPROM location 0x04 0x01 the ADC DIG I O module enters an asynchronous update mode whereby any detected change on the Digital Input port or the Counter Capture port causes the I O module to transmit data to the host Status Change Data Sent by I O Module Digital Input port change Counter Capture change HOST 1 Data Sent by Module 1 O Module Computer ADC x DIG x Timer Async Mode Timed Update When EEPROM location 0x04 0x02 0xFF the ADC DIG I O module enters a timed update mode whereby the I O module will send data to the host after the specified time pe
14. If you are fortunate enough to convert the Bipolar ASCII hexadecimal value directly to a signed integer then conversion from ADC_Sample to volts is very simple Volts bipolar ADC_Sample Vref 2048 Offset_Calibration Bipolar Conversion If ADC Sample is an unsigned integer value Most often the ADC_Sample value is represented as an unsigned integer quite common when converting the Bipolar ASCII hexadecimal analog reading using the C language scanf function If an unsigned integer is used we must manually calculate a negative number if ADC Sample gt 2048 Volts bipolar ADC_Sample 4097 Vref 2048 Offset_Calibration if ADC_Sample lt 2047 Volts bipolar ADC_Sample Vref 2048 Offset_Calibration Offset Calibration The Linear Technologies LTC 1296 A D converter used in the ADC x modules can exhibit an offset phenomenon This offset phenomenon is unique to each LTC 1296 and a calibration of the offset is required to obtain the most accurate analog readings The offset calibration is used only with Bipolar analog samples To obtain the current A D offset use the following procedure 1 Connect analog CHO to GND use a jumper or clip lead 2 Take a Bipolar analog reading 3 The negative opposite sign of this value is the offset calibration to be added to samples At the factory an offset calibration is performed and stored in EEPROM location OxOF as an 8 bit 2 s complement number Offset
15. PCB populated with different ICs dependent on the interface and Analog Input requirements 1 O Module features MPU Microchip PIC16C65 EEPROM Microchip 25C040 MPU Clock 7 3728 Mhz Interface RS 485 multidrop up to 255 nodes or RS 232 single ended Baud 9600 19200 57600 115200 DIP switch selectable default LED Bicolor diagnostic LED Watchdog MPU has built in watchdog timer POR MPU contains timed Power On Reset circuitry Brownout MPU brownout detection ciruictry built in Temperature 0 70 C 32 158 F Extended temperature version available PCB FR4 Power 7 5Vdc 30 0Vdc approx 50 ma Transient ZNR surge supression on V power input TransZorb protection on RS 485 data lines 485 25A RS232 RS485 converter RS 232 Full duplex Host Controller Address 0 ADC x 12 bit analog acquisition 12 bit analog acquisition 16 bit digital O 16 bit digital O Peripheral Module Address 1 16 bit digital I O Peripheral Module Address 2 Up to 255 modules SuperLogics ADC DIG User s Manual Quick Start So you re in a hurry Let s see if we can help You need the following e HyperTerminal program Windows 95 98 or Windows NT e An open COMPORT on your PC e Power supply we suggest a 9Vdc wall wart e A cable to connect your PC to your I O Module See PCB Details section for pinout e If you have an RS 485 interface you need a 485 25E converter Make these DIP switch settings STEET SW1 OF
16. R DTR CD DB25 pins 20 8 6 wired together DB9 pins 6 4 1 wired together RS 232 Software Flow Control Xon Xoff The SuperLogics ADC x DIG x I O modules do not support Xon Xoff flow control SuperLogics ADC DI G User s Manual Digital I O Technical Info Digital I O Characteristics The following chart lists the Digital I O characteristics and values Characteristic Value Digital 1 O Current I O line source amp sink 25 ma Total current PORT1 200 ma Total current PORT2 200 ma Digital I O Voltage Levels Input Off 0 OV 0 8V Input On 1 2 0V 5 0V Output Off 0 0 6V max Output On 1 4 3V min Pulse Counter Input 1 Mhz max input rate 16 bit counter capture Counter increments on high low transition Digital Port Configuration Example Any Digital I O configuration changes made to the I O Module using the T command are stored in EEPROM locations 0x02 and 0x03 EEPROM Location 0x02 Port 1 I O Configuration EEPROM Location 0x03 Port 2 I O Configuration When using either the T command or directly writing to EEPROM using the W command a binary 1 at a bit location puts the I O line into Input mode while a binary 0 at a bit location puts the I O line into Output mode NOTE All numeric data is represent as ASCII Hexadecimal integers The symbol equates to a carriage return decimal 13 hex 0x0D Host Command Module Response Action To All I O lines are configured as Outp
17. Stored 8 bit value at EEPROM location 0x0F if Offset_Stored gt 128 Offset_Calibration Offset_Stored 256 Vref 2048 if Offset_Stored lt 127 SuperLogics ADC DIG User s Manual Analog Input Technical Info Sampling Current 4 20 ma Inputs Many devices output a current value instead of a voltage value The secret to obtaining current readings is a 250 ohm resistor and a 5V voltage reference Placing a 250 ohm resistor to ground on a 4 20 ma current input will create a voltage potential of 1V to 5V If we remember Ohm s law CHx analog input channel lt S E i R 250 ohm R 250 ohms 004 to 020 amps 4 20 ma E 1 0V to 5 0V NOTE We supply several ultra precision 250 ohm 0 1 resistors with each ADC x module Obtaining current readings is a three step process 1 Perform analog Unipolar sample 5 000V reference must be used 2 Convert unipolar sample to volts 3 Convert voltage to amps Current Conversion The following formula will convert the raw analog sample reading to a current value Current ADC_Sample 5 000 4096 250 Obtaining accurate Analog samples Please keep the following points in mind when attempting to obtain accurate samples A Watch out for UPS systems They create loads of EMI EMF noise B Keep the analog signal source as close to the ADC x module as possible C Keep transformers far away from the ADC x module D Avoid high impedance analog signal source
18. eturns current output port status O Output digital port xx PORT PORTB yy PORT2 PORTD T Set digital direction xx PORTI PORTB yy PORT2 PORTD bit set 1 Input bit clear 0 Output Get current digital direction xx PORT PORTB yy PORT2 PORTD bit set 1 Input bit clear 0 Output Get Pulse Counter xxxx 16 bit counter value Clear Pulse Counter Bipolar sample analog y control nibble xxx analog value Unipolar sample analog y control niblle xxx analog value Get receive error count xx current count Clear receive error count PWM xx PWM frequency yyy PWM duty Write EEPROM yy address xx value Read EEPROM yy address in command xx value in reponse Start stream continuous mode Halt stream continuous mode Reset CPU Command error response RS 232 Interface Example Commands ADC DIG User s Manual Command Response RS 232 Interface The following table illustrates actual command and response data for an RS 232 interface NOTE All numeric data is represent as ASCII Hexadecimal integers The symbol J equates to a carriage return decimal 13 hex 0x0D Command Response Sent by Host Sent by I O Module Description V20 Module Firmware version 2 0 IFF00 Input digital port PORT1 bits0 7 ON PORT2 bits0 7 OFF Note this command also returns the current digital output OJ Outp
19. og Configuration 0x00 No analog samples 0x01 0x08 Number of analog samples 0x0y 0x0y Bipolar Analog y analog control nibble Ox8y Ox8y Unipolar Analog y analog control nibble Ox0y OxOy Bipolar Analog y analog control nibble Ox8y Ox8y Unipolar Analog y analog control nibble Ox0y OxOy Bipolar Analog y analog control nibble Ox8y Ox8y Unipolar Analog y analog control nibble Ox0y OxOy Bipolar Analog y analog control nibble Ox8y Ox8y Unipolar Analog y analog control nibble Ox0y OxOy Bipolar Analog y analog control nibble Ox8y Ox8y Unipolar Analog y analog control nibble Ox0y OxOy Bipolar Analog y analog control nibble Ox8y Ox8y Unipolar Analog y analog control nibble Ox0y OxOy Bipolar Analog y analog control nibble Ox8y Ox8y Unipolar Analog y analog control nibble Ox0y OxOy Bipolar Analog y analog control nibble Ox8y Ox8y Unipolar Analog y analog control nibble 0x00 Digital Input status disabled 0x01 OxFF Digital Input status enabled 0x00 Pulse Counter status disabled 0x01 OXFF Pulse Counter status enabled Continuous Mode Example In this example the I O module EEPROM is configured to take 2 Analog samples and update the Counter status EEPROM Location 0x10 0x02 Take 2 Analog samples EEPROM Location 0x11 0x08 Sample 1 Bipolar sample CHO EEPROM Location 0x12 0x89 Sample
20. ontinuous mode Illegal in RS 485 Mode 1300Z 0013Z Reset CPU forces a watchdog timeout after Z response sent to Host NOTE A command addressed to Module address OxFF is accepted by all Modules SuperLogics ADC DI G User s Manual Analog Control Nibble Analog Control Nibble and Example The ADC x module utilizes the Linear Technologies LTC1296 analog to digital conversion chip In the process of performing a data sample the user sends a control nibble to the ADC x module The ADC x module in turn performs a data conversion using the control nibble and transmitts a response data sample back The following table lists each of the 16 possible ana log configurations NOTE All numeric data is represent as ASCII Hexadecimal integers The symbol J equates to a carriage return decimal 13 hex 0x0D See ADC Technical Info section for sample to volts conversion Control Nibble Analog Sample Sent by Host Differential CH0 CH1 Differential CH2 CH3 Differential CH4 CH5 Differential CH6 CH7 Differential CH0 CH1 Differential CH2 CH3 Differential CH4 CH5 Differential CH6 CH7 Single Ended CHO Single Ended CH2 Single Ended CH4 Single Ended CH6 Single Ended CH1 Single Ended CH3 Single Ended CH5 Single Ended CH7 0 1 2 3 4 5 6 7 8 9 A B C D E F Command Response Description Sent by Host Sent by I O Module QOJ Q100
21. riod has elapsed Time Period Value EEPROM location 0x04 1 second When using Async Timed Update the I O module uses the Continuous Mode configuration to determine the data sent to the host Continuous Mode The final mode of operation is Continuous mode This mode constantly sends or streams data to the host until the host halts the mode Since the I O module sends data continuously in this mode only the RS 232 interface can be configured for Continuous mode RS 485 is half duplex and there would be no way to halt the stream of data coming from the I O module In brief the I O Module can send 0 thru 8 analog samples digital input status and the counter capture status The I O module uses parameters found in EEPROM locations 0x10 thru 0x1A to configure the continuous mode Therefore the EEPROM must be configured before engaging the Continuous mode Continuous mode setup steps 1 Configure EEPROM locations 0x10 thru 0x1A 2 Begin Continuous mode by sending command S to the I O Module 3 Halt Continuous mode by sending command H to the I O Module SuperLogics ADC DI G User s Manual Modes of Operation Continuous Mode Configuration EEPROM Locations All parameters configuring the Stream Continuous mode are strored in EEPROM See the following table for a description of the locations and the parameters Use command W to update EEPROM values EEPROM Location Value Description 0x00 0x08 Anal
22. s E Use good wiring practices especially in regards to ground connections F RS 232 interface can generate approx 2 mv noise G RS 485 interface offers the best noise immunity Warranty SuperLogics warranties all products against defective workmanship and components for a period of one year after purchase SuperLogics agrees to repair or replace at its sole discretion a defective product if returned to SuperLogics with proof of purchase within this period
23. ut digital port PORTI bits 0 7 OFF PORT2 bit 7 OFF bits 0 6 ON TH Set digital direction PORT1 bits 0 7 INPUT PORT2 bit 7 INPUT bits 0 6 OUTPUT GFF80 Get current digital direction PORT1 bits 0 7 INPUT PORT2 bit 7 INPUT bits 0 6 OUTPUT N0003 Get pulse counter Current count 3 M4 Clear pusle counter Current count 0 Q100F J Bipolar analog control nibble 0x1 Analog reading 0x00F U840FJ Unipolar analog control nibble 0x8 Analog reading 0x40F K00 Current receive errors 0 JL Clear receive error count Current receive errors 0 PJ PWM freq 51200 Hz PWM duty 12 5 W Write EEPROM Address 0x04 with value 0x10 R10 Read EEPROM Adress 0x04 value is 0x10 S IFFOOJ Q100F J IFFOO Q100F START stream continuous mode See Modes of Operation section This example illustrates stream mode configured to continuously update with Input Digital Port command and Query Analog command with control 0x1 The module continues until a command H is received HJ HALT stream continuous mode Zal Reset CPU forces a watchdog timeout RS 485 Interface Example Commands The following table illustrates actual command and response data for an RS 485 interface NOTE ADC DIG User s Manual Command Response RS 485 Interface All numeric data is represent as ASCII Hexadecimal integers Example Host Address 0x
24. uts To All I O lines are configured as Inputs TJ Port 1 bits 0 7 Inputs Port 2 bits 0 7 Outputs TJ Port 1 bits 0 7 Outputs Port 2 bits 0 7 inputs TJ Port 1 bits 4 1 Inputs Port 1 bits 7 6 5 3 2 0 Outputs Port 2 bits 4 5 2 Inputs Port 2 bits 7 6 3 1 0 Outputs SuperLogics ADC DI G User s Manual Digital 1 O Technical Info Pulse Width Modulation PWM The ADC x and DIG x I O modules have a configurable PWM output There are two settings to configure for proper PWM operation PWM frequency and PWM duty cycle The current capability of the PWM output is the same as a Digital I O line source amp sink 25 ma PWM Command Pxxyyy xx Pwm_Divisor yyy Pwm Duty 10 bits max Pwm_Divisor 0x00 OxFF Pwm Duty 0x000 0x3FF Pwm_Duty 0 PWM output is disabled output 0 PWM Control Fpwm Frequency of PWM output in Hz Pwm_Duty_Percentage PWM duty cycle output on for period Fowm Fpwm 460800 Hz Pwm_Divisor 1 Duty_Resolution log 1843200 Fpwm log 2 Pwm Duty Percentage Pwm Duty 274 ssonu on Pwm_Divisor Fpwm Duty_Resolution 1800 Hz 10 bits If Pwm_Duty gt Duty_Resolution then Pwm_Duty_Percentage 100 1807 Hz 10 bits Note Pwm_Divisor OxFF cannot 51200 Hz 5 bits achieve complete 100 duty cycle Use Pwm_Divisor OxFE if 100 duty cycle 460800 Hz 2 bits is required Example PWM Commands All numeric data is represent as ASCII
25. ype Unipolar Analog Sampling Unipolar analog sampling span is from ground GND to voltage reference Vref Only positive voltages are sampled in unipolar mode The unipolar sample is represented as an unsigned integer as follows Unipolar voltages OV Vref The benefit of using Unipolar samples over Bipolar samples is that a 12bit binary value is spread out over less total voltage span Vref total 1bit unipolar Vref 4096 Bipolar Analog Sampling Bipolar analog sampling span is from Vref to Vref Both negative and positive voltages are sampled and represented as a signed binary integer 2 s complement as follows Bipolar voltages Vref O Vref The benefit of using Bipolar sampling over Unipolar is obvious negative voltages The downfall of using Bipolar sampling is that a 12 bit binary value is spread out over a larger total voltage span 2 Vref total 1bit bipolar Vref 2048 SuperLogics ADC DI G User s Manual Analog Input Technical Info Voltage Conversion The Analog conversion value obtained from the ADC x module is represented as an integer value either signed for Bipolar samples or unsigned for Unipolar sample and is normally converted to a Real or Floating Point number for ultimate usage Vref 5 000 4 096 2 500 or 1 200V Unipolar Conversion ADC Sample is an unsigned integer value Volts unipolar ADC_Sample Vref 4096 Bipolar Conversion If ADC Sample is a signed integer value
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