Users Manual - Integrity Instruments
Contents
1. Integrity Instruments P O Box 451 Order Phone 800 450 2001 Pine River Minnesota Fax Phone 218 587 3414 56474 USA Tech Phone 218 587 3120 http www integrityusa com 485M300 Series I O Modules Digital I O Analog I O Integrity Instruments 485 300 Series User Manual Table of Contents Introduction Features arna Seed 3 Quick Start esel 4 Communications RS 232 Packet Information sese 6 Commands and Responses Command and Response 7 Command and Response Examples 8 Analog Control 9 Module Configuration EEPROM Map seine x 10 Sampling rates Analog and eet cet enda 11 Mode of Operation Polled Mode guns reti rete eie re rtt 11 Digital I O Technical Information Digital I O Characteristics sssssseeeeeeee 12 Digital I O Port Configuration Example 12 PWM Characteristics 213 PWM Commands Analog I O Technical Information Analog I O Characteristics ssssseeeeee Voltage References rnannrnnnnnnvnnnnnrnnnnnnrennnnnrnnnnnnnnsnnnnnnnnnnneserne Analog Voltage Sampling Analog Conversion i Analog Offset Calibration Anal2. CHO CH1 Differential CH2 CH3 Differential CH4 CH5 Differential CH6 CH7 Single Point CHO Single Point CH2 Single Point CH4 Single Point CH6 Single Point CH1 Single Point CH3 Single Point CH5 AJ OJN Single Point CH7 Command Response Description Sent by Host Sent by I O Module 1300Q0 1 Q000F 1 Bipolar sample differential CHO CH1 Control 0 Analog sample 0x00F decimal 15 1300UA 1 UA123 1 Unipolar sample CH4 Control 7 A Analog sample 0x123 decimal 291 Integrity Instruments 485 300 Series User Manual EEPROM Map Address Description 0x00 Module Address RS 485 address factory default 0x01 0x01 N A Reserved 0x02 Data Direction Port 1 Bit set 1 Input Bit clear 0 Output factory default OxFF Data Direction Port 2 Bit set 1 Input Bit clear 0 Output factory default OxFF 0x06 Port 1 Power on Default output factory default 0x00 0x07 Port 2 Power on Default output factory default 0x00 0x08 Expander board flag Opto 22 modules attached See Note 1 0x00 No expander board attached OxFF Expander board attached invert digital signals factory default 0x00 0x09 0x0A D A Channel 0 Power on Default output 12 bits upper nibble in 0x09 lower byte in Ox0A factory default 0x000 0x0B 0x0C D A Channel 1 Power on Default ou
3. The Polled Mode is the most common usage of the 485M300 Series I O modules In this mode the Host computer sends a command to the I O Modules which in turn sends an associated response back to the Host computer 1 Command Sent by Host I O Module HOST Computer 2 Response Sent by Module 485M300 Series 11 Integrity Instruments 485 300 Series User Manual Digital I O Characteristics The following chart lists the Digital I O characteristics and values Characteristic Value Digital I 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 32 bit counter capture Counter increments on high low transition Digital Port Confiquration 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 e All numeric data is represent as ASCII Hexadecimal integers e The symbol equates to a carriage re
4. 0V to 5 0V Obtaining current readings is a three step process 1 Perform analog Unipolar sample 2 Convert unipolar sample to volts 3 Convert voltage to amps 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 Avoid high impedance analog signal sources Watch out for UPS systems They create loads of EMI EMF noise Keep the analog signal source as close to the ADC x module as possible Keep transformers far away from the 485M300 Series module Use good wiring practices especially in regards to ground connections RS 232 interface can generate approx 2 mv noise Resistors for Analog and Digital I O The digital I O points have a 100K O resistor to ground to prevent floating inputs The analog inputs have a 560 resistor in series to afford some protection to the A to D converter V From analog input To a d input From input To cpu input 16 Integrity Instruments 485 300 Series User Manual Digital amp Analog I O Port Pin outs Analog And Hex Conversion Chart EXAMPLE HEX CONVERSION TPP E TTT TTT ut 1 V Unreg GND es 7 i Integrity Instruments 485 300 Series User Manual Model 485M300 Series Communications LED Powe
5. used the sam ple time can be increased by using a slower CLK frequency Sampling Analog Voltage Inputs By far the most common configuration of the 485M300 Series I O modules 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 1 Unipolar 2 Bipolar Both A D sampling types result in a 12 bit binary integer value Vref 5 000 standard Unipolar Analog Sampling Resolution 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 12 bit binary value is spread out over less total voltage span Vref total 1 LSB unipolar Vref 4096 1 LSB unipolar 5 000 4096 1 LSB unipolar 0 0012207 volt 14 Integrity Instruments 485 300 Series User Manual Bipolar Analog Sampling Resolution 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 0 Vref The benefit of using Bipolar sampling over Unipolar is obvious negative voltages The do
6. 6 duty cycle is required Example PWM Commands e All numeric data is represent as ASCII Hexadecimal integers e The symbol equates to a carriage return decimal 13 hex OxOD Host Command Module Response Action P0000 1 PWM off Any duty cycle of 0 disables PWM output P4801F 1 PWM frequency 50499 Hz PWM duty 10 6 PFE3FF4 PWM frequency 14456 Hz PWM duty 100 PFE1FE4 PWM frequency 14456 Hz PWM duty 50 13 Integrity Instruments 485 300 Series User Manual Analog I O Characteristics Characteristic Value A D Converter Linear Tech LTC1296BCN 5LSB Linearity Error LTC1296BCN x 0 012 5 LSB Gain Error 0 012 5 LSB Offset Error 0 17 Temperature Drift 100 ppm C max Max Input Voltage 5V D A Converter Linear Tech LTC1448 Offset Error 10 mv LTC1296 Operation The analog inputs of the LTC1296 look like a 100pf capacitor Cin in series with a 500 O resistor Ron Cin gets switched between and inputs once during each conversion cycle Large external source resistors and capacitances will slow the settling of the inputs It is important that the overall RC time constant is short enough to allow the analog inputs to settle completely within the allowed time The voltage on the inputs must settle completely within the sample period Minimizing Rsource will improve the settling time If large source resistance must be
7. ASCII Hexadecimal Digit Address 0x00 Host Device IBM PC micro controller etc Address 0x01 0xFE I O Module Address Address OxFF Broadcast Address used to configure an I O Module Commands and Responses The following table illustrates the Integrity Instruments I O module commands and responses NOTE e All numeric data is represent as ASCII Hexadecimal integers value x y in the table e module receives an illegal or improperly formatted command Error Response is sent e All ASCII characters are CASE SENSITIVE use all capital letters Integrity Instruments 485 300 Series User Manual Commands and Responses v3 0 Firmware Command Response Sent by Host Sent by I O Module Description V Vxy Firmware version x y Ixxyy Input digital port status xx PORT1 yy PORT2 Also returns current output port status Output digital port xx PORT 1 yy PORT2 Set digital direction xx PORT 1 yy PORT2 bit set 1 Input bit clear 0 Output Get current digital direction xx PORT 1 yy PORT2 bit set 1 Input bit clear 0 Output Get Pulse Counter 32 bit counter value M Clear Pulse Counter Bipolar sample analog y control nibble xxx analog value Unipolar sample analog y control niblle xxx analog value D A output y channel setting O or 1 xxx 12 bit D A output Get receive
8. 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 to 70 C 32 to 158 F Commercial Temperature Range 40 to 85 C 40 to 185 F Industrial Temperature Range PCB FR4 Power 7 5Vdc to 15 0Vdc approximately 50 ma 485M300 Series Features 16 Digital I O lines 8 12 bit Analog Inputs 2 12 bit Analog Outputs PWM Output 32 bit Pulse Counter 1 Mhz XP485 25E RS232 RS485 converter Host Controller Address 0 485M3A0 12 bit analog acquisition RS 485 16 bit digital multi drop Peripheral Module 1 pair wire Address 1 4000 feet 485M300 16 bit digital Peripheral Module Address 2 Up to 255 modules Integrity Instruments 485 300 Series User Manual Quick Start Instructions You need the following e EZTerminal program available free on our website http www integrityusa com An open COMPORT on your PC Power supply PS9J 9VDC 400 ma unregulated A cable to connect your PC to your 485M300 I O module If you use your com port you need a XP485 25E RS 232 to RS 485 converter Make these DIP switch settings for 115 200 baud SW1 ON SW2 ON These are factory default settings see page 22 Launch the EZTerminal program 1 Double click the icon in whatever area you have put the program Under Settings then choose Comport and select your RS 232 p
9. 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 Reset CPU Command error response Integrity Instruments RS 485 Interface Example Commands The following table illustrates actual command and response data for an RS 485 interface NOTE 485M300 Series User Manual e All numeric data is represent as ASCII Hexadecimal integers e Example Host Address 0x00 and Module Address 0x13 e The symbol equates to a carriage return decimal 13 hex OxOD Command Sent by Host Response Sent by I O Module Description 1300V 1 0013V30 1 Module Firmware version 3 0 130014 0013IFF00 1 Input digital port PORT1 bits0 7 ON PORT2 bits0 7 OFF Note this command also returns the current digital output 13000007F 00130 Output digital port PORT1 bits 0 7 OFF PORT2 bit 7 OFF bits 0 6 ON 1300TFF80 1 0013T 1 Set digital direction PORT1 bits 0 7 INPUT PORT2 bit 7 INPUT bits 0 6 OUTPUT 13006 0013GFF80 1 Get current digital direction PORT 1 bits 0 7 INPUT PORT2 bit 7 INPUT bits 0 6 OUTPUT 1300N 0013N0000000F 1 Get pulse counter Current count 15 1300M 1 0013M 1 Clear pulse counter Current count 0 1300Q1 1 0013Q100F 1 Bipolar analog control nibble 0x1 Analo
10. es A single pair of data lines act as both Transmit and Receive wires Data lines A B are the only wires required between RS 485 nodes All RS 485 nodes need not share the same V and GND Cabling Notes 1 Gnd and Shld are connected internally within the 485M300 Series modules 2 Cable termination is important for long distanceand high speed applications 3 Suggested cable 24 awg stranded twisted pair with shield for cable runs in excess of 200 feet See also Belden cable 9841 and 9463 4 The normal connection method is the Daisy Chain type shown below there are other kinds of connections but this is considered as the standard 5 Theend units END 1 and END 2 should be terminated All other units should not DAISY CHAIN 19 Integrity Instruments 485 300 Series User Manual Peripheral Add On Modules AE 8CH 8 channel analog connection board ASC 2CH 2 channel signal conditioner DB15TSM DB15 terminal strip for analog connector DB25TSM DB25 terminal strip for digital connector EXP x Digital Interface board Model AE 8CH Analog Connection Board Jumper configurable analog inputs 1 4 20 ma inputs 2 10 Vdc inputs 3 Solid state temperature probes Handy terminal strip for all analog connections and voltages MTA 100 jacks are also available for solid state temperature probes available from Integrity Instruments Model ASC 2CH Signal Conditioning Board 2 channels of precision instrumenta
11. g reading 0x00F 1300U8 1 0013U840F Unipolar analog control nibble 0x8 Analog reading 0x40F 1300L 1800 1 0013L 1 D to A Output Channel 1 2 5 Volts 1300K 1 0013K00 1 Current receive errors 0 1300J 1 0013J 1 Clear receive error count Current receive 1300P4801F 1 0013P 1 PWM freq 50499 Hz PWM duty 10 6 1300W0410 1 0013W 1 Write EEPROM Address 0x04 with value 0x10 1300R04 1 0013R10 1 Read EEPROM Adress 0x04 value is 0x10 1300Z 1 0013Z 1 Reset CPU forces a watchdog timeout after Integrity Instruments 485 300 Series User Manual Analog Control Nibble and Example The 485M300 Series modules utilizes the Linear Technologies LTC 1296 analog to digital conversion chip In the process of performing a data sample the user sends a control nibble to the 485M300 module The 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 analog configurations NOTE e All numeric data is represent as ASCII Hexadecimal integers e The symbol equates to a carriage return decimal 13 hex OxOD e Technical Info section for sample to volts conversion Control Nibble Analog Sample Sent by Host o Differential CHO CH1 Differential CH2 CH3 Differential CH4 CH5 Differential CH6 CH7 Differential
12. mmand e Type 0100V and the Enter Key e You should see 0001V30 on the screen e NOTE Make sure to type CAPITAL V not lowercase v After your first command see Commands and Responses section for more commands Screenshots and setup instructions performed running EZTerminal on a PC installed with Microsoft Windows XP Operating System terer 5 ipii f e Seng ogg Wee rep OSU SER SO Integrity Instruments 4854300 Module v3 0 D100V po01v30 Ready KOM 115200 RTGS OTRO CTO CO NUM Integrity Instruments 485 300 Series User Manual Communications The Integrity Instruments 485M300 Series modules use RS 485 as the communications interface The interface uses simple ASCII commands A carriage return decimal code 13 or Hex code 0x0D marks the end of a data packet Line feeds decimal code 10 or Hex code 0x0A are ignored RS 485 Interface e RS 485 operates Half Duplex e Each module node on the bus has a unique Address 1 to 254 0x01 0xFE hex e We use the Linear Technologies amp RS 485 bus drivers LTC1487 allowing up to 256 nodes on the RS 485 multi drop bus X Address 0 0x00 hex is reserved for the Host controller e X Address 255 OxFF hex is reserved for Broadcast messages Address OxFF is ccepted by all modules on the RS 485 bus RS 485 Packet Format Destination Address Source Address Command Response CR xx ASCII carriage return 13 0x0D hex x
13. og Current Sampling sse Analog Current Conversion Digital amp Analog I O Port Specifications Digital amp Analog pinouts sssssssssseeeeenne 17 Module Specifications PGB Illustrations rer terre tiet rne Dip switch and jumper settings zi 485M300 Series Module 19 485 cable specifications 19 Peripherals Analog expander sssssssssssseeeeeneneeneenee nennen 20 Analog signal conditioner 20 Analog terminal 20 Integrity Instruments 485 300 Series User Manual Introduction Welcome to the Integrity Instruments 485M300 Series of I O modules These modules using RS 485 communications are available in different configurations dependent on your needs and applications In addition they are offered in an enclosure or open allowing you the end user complete flexibility when determining the parameters for your project Configurations for 485M300 models with enclosure are 485M300CE 16 digital I O 485M3A0CE 16 digital I O and 8 channels A to D conversion 485M3ADCE 16 digital I O and 8 channels A to D conversion and 2 channels D to A conversion Module features MPU Microchip PIC16C65B EEPROM Microchip 25C040 MPU Clock 14 7456 Mhz Interface RS 485 multidrop up to 255 nodes Baud 9600 19200 57600 115200 DIP switch selectable LED
14. ort 115 200 Baud Rate 8 Data Bits NO PARITY and 1 Stop Bits 3 Under Settings now choose Terminal Settings and check the Append LF to incoming CR box and Local echo typed characters check box 4 You may change the color of the transmitted and received characters by going under Settings and selecting Colors then Transmit or Receive and pick the color of your choice ted meme igixi Fe logg Wem Pep OSG SEARD Step 1 Lu J E Panty 115200 RISD OTRO CTSO OSE OD REO HK aioi xi Steps 2 amp 3 amp L 115200 RISS OTIO CTSO OSE CD RED Integrity Instruments 485 300 Series User Manual CITED ali xi E nisi Dsg Step 3 m Step 2 P c 2 vette 2 0 M v Ld c am 3 DERE cons J no J ie OLLE gt EI SRT MEET A arr L r aaa e ume wet nb D em por n mens snr m DE Step 4 i i i i i i E E PIT aki 4 Your First Command Now that you have a EZTerminal session running your ready to power up the 485M300 Series O Module After powering up your 485M300 Series Module EZTerminal will receive a welcome message from the unit indicating you are ready to provide your first command RS 485 Firmware Version Co
15. r Port DIP switch Digital I O 485M300 Series IC descriptions Model 485M3AD Position and type is the same for all models PIC16C65B MPU LTC1487 RS 485 driver 8 pin DIP 25C040 EEPROM 8 pin DIP LTC1296 A to D 20 pin DIP LM4040AIZ 5 0 0 1 Voltage Reference LMC555 Timer charge pump 8 pin DIP LTC1448 D to A 8 pin DIP Baud Rate Switch and Jumper Settings Baud Rate Jumper Settings factory default OFF OFF 9600 baud JP3 JP4 On 485 termination OFF ON 57600 baud JP5 On Approx 2ms Delayed Response ON ON 115200 baud factory default Integrity Instruments 485 300 Series User Manual 485M Series Module Specifications LED Operation Blinking Green 1 per Second Unit functioning correctly idle Blinking Green Rapid or Steady Unit receiving serial data Blinking Red Rapid or Steady Unit transmitting serial data No LED Unit is not functioning Power Supply 7 5 15 0Vdc approx 50 ma we suggest our PS9J 9VDC 400 ma unregulated GND and Shield The GND and Shield terminals are connected on the 485M300 Series boards and are therefore electrically equivalent GND VDC JP3 JUMPER te o SIGNALA R4 R3 10 JP4 JUMPER Power 2 5mm 1 2 SIGNAL B i gt Kat Power Connector 10 on board wiring R2 RS 485 Cabling The 485M300 Series is designed to operate in a Multi Drop RS 485 LAN configuration In a half duplex mullti drop environment all RS 485 nodes share the same data lin
16. tion amplifiers Gains of 1 10 100 1000 Handy terminal strip for all analog connections and voltages Models DB15TSM and DB25TSM DB Terminal Strip Terminal strip boards to conveniently connect to DB15 and DB25 connectors Models EXP x Digital Interface Board The EXP X unit provides for digital interface and signal conditioning via industry standard opto isolated I O modules such as Opto 22 Each unit has 4 I O points with large easy to use terminal screws If more I O points are required simply plug in another unit up to 16 total I O points Opto isolated modules 90V 140V AC input 12V 140V AC output 3 3V 32V DC input 3V 60V DC output WARRANTY Integrity Instruments warranties all products against defective workmanship and components for the life of the unit Integrity Instruments agrees to repair or replace at it s sole discretion a defective product if returned to Integrity Instruments with proof of purchase Products that have been mis used improperly applied or subject to adverse operating conditions fall beyond the realm of defective workmanship and are not convered by this warranty Copyright 2000 2003 Integrity Instruments Inc All trademarks and or registered trademarks are the property of their respective owners Revision January 3 2005 v3 0 20
17. tput 12 bits upper nibble in OxOB lower byte in Ox0C factory default 0x000 0x0D A D Channels sample clock rate See Note 2 0x00 Normal A D Channels sample clock rate OxFF Slowed A D Channels sample clock rate factory default 0x00 0X04 0X05 N A Reserved OxOE OxOF 0x10 0xFF Available to User WARNING The I O Module CPU must be reset before new EEPROM settings take effect 1 This flag is used when an expander board is attached It allows for polarity interface to the industry standard I O modules used with the expander board based on open collector logic that these modules use 2 This is used to slow the A D Channel sample clock rate This may help when the A D channels have a high impedance input attached NOTE 10 Integrity Instruments 485 300 Series User Manual Analog amp Digital I O Sampling Rates Analog I O Baud Rate Delayed Response No Delayed Response 115 200 141 486 57 600 123 257 19 200 62 9600 37 Digital I O Baud Rate Delayed Response No Delayed Response 115 200 164 523 57 600 123 273 19 200 94 9600 47 Sampling rates are in samples per second for a single analog channel or 8 bit digital I O port tested on Windows 2000 850 Mhz P3 with A D clock running at full speed Samples per channel Sample rate number of channels being sampled Modes of Operation The Integrity Instruments 485M300 Series I O modules operates in the Polled Mode Polled Mode
18. turn decimal 13 hex OxOD Host Command Module Response Action T0000 1 TA All I O lines are configured as Outputs TFFFF 1 TA All I O lines are configured as Inputs TFFO00 1 TH Port 1 bits 0 7 Inputs Port 2 bits 0 7 Outputs TOOFF 1 TH Port 1 bits 0 7 Outputs Port 2 bits 0 7 inputs T1234 Ta 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 12 Integrity Instruments 485 300 Series User Manual Pulse Width Modulation PWM Characteristics The 485M300 Series modules have a configurable PWM output There are two settings to configure for proper PWM operation PWM frequency and PWM duty cycle PWM Command Pwm Divisor yyy Pwm Duty 10 bits max Pwm Divisor 0x00 OXFF Pwm Duty 0x000 OX3FF Pwm Duty 0 PWM output is disabled output 0 PWM Control Values 14 7456 Mhz clock PWM Period Pwm Divisor 1 3686400 PWM Duty Period Pwm Duty 14745600 Duty Resolution log 14745600 Fpwm log 2 PWM Duty Cycle PWM Duty Period PWM Period if PWM Duty Period gt PWM Period then PWM Duty Cycle 100 Pwm Divisor PWM Freq Duty Resolution OxFF 255 14400 Hz 10 bits see note OxFE 254 14456 Hz 10 bits Ox5B 91 40069 Hz 8 bits 0x00 0 3686400Hz 2bits Note Pwm Divisor OxFF cannot achieve complete 100 duty cycle Use Pwm Divisor OxFE if 1009
19. wnfall of using Bipolar sampling is that a 12 bit binary value is spread out over a larger total voltage span 2 Vref total 1 LSB bipolar 7 Vref 2048 1 LSB bipolar 5 000 2048 1 LSB bipolar 0 0024414 volt Voltage Conversion The Analog conversion value obtained from the 485M300 Series 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 standard Unipolar Voltage Conversion Formula Volts unipolar ADC Sample 5 000 4096 Volts unipolar ADC Sample 0 0012207 Bipolar Voltage Conversion Formula The following assumes that ADC_Sample is an unsigned integer value if ADC_Sample gt 2048 Volts bipolar ADC_Sample 4096 5 000 2048 if ADC_Sample lt 2047 Volts bipolar ADC_Sample 5 000 2048 if ADC_Sample gt 2048 Volts bipolar ADC_Sample 4096 0 0024414 if ADC_Sample lt 2047 Volts bipolar ADC_Sample 0 0024414 15 Integrity Instruments 485 300 Series User Manual 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 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 E I R R 250 ohms I 004 to 020 amps 4 20 ma E 1
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