MOD-RS485-ISO user`s manual
Contents
1. MOD RS485 ISO Isolated extension board with RS485 interface USER S MANUAL Revision B October 2012 Designed by OLIMEX Ltd 2012 lead free All boards produced by Olimex LTD are ROHS compliant OLIMEX 2012 MOD RS485 ISO User s Manual DISCLAIMER 2012 Olimex Ltd Olimex logo and combinations thereof are registered trademarks of Olimex Ltd Other product names may be trademarks of others and the rights belong to their respective owners The information in this document is provided in connection with Olimex products No license express or implied or otherwise to any intellectual property right is granted by this document or in connection with the sale of Olimex products The Hardware project is released under the Creative Commons Attribution Share Alike 3 0 United States License You may reproduce it for both your own personal use and for commertial use You will have to provide a link to the original creator of the project http www olimex com on any documentation or website You may also modify the files but you must then release them as well under the same terms Credit can be attributed through a link to the creator website http www olimex com The software is released under GPL It is possible that the pictures in this manual differ from the latest revision of the board The product described in this document is subject to continuous development and improvements All particulars of the product and its use cont2. 012 MOD RS485 ISO User s Manual CHAPTER 8 REVISION HISTORY AND SUPPORT 8 Introduction to the chapter In this chapter you will find the current and the previous version of the document you are reading Also the web page for your device is listed Be sure to check it after a purchase for the latest available updates and examples 8 1 Document revision Changes Modified Page ae Initial Creation 20 09 12 B Various spelling errors and discrepancies Various 05 10 12 fixed 8 2 Board revision Remember to check the schematics and the board design files to compare the differences Notable Changes pe Initial release of the board 8 3 Useful web links and purchase codes The web page you can visit for more info on your device is Page 18 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual https www olimex com Products Modules Interface MOD RS485 ISO A place for general questions FAQ or friendly talk check our forums https www olimex com forum ORDER CODES MOD RS485 ISO the product subject in this manual How to order You can purchase from our online shop or by any of our distributors Check http www olimex com for more info Page 19 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual 8 4 Product support For product support hardware information and error reports mail to support olimex com Note that we are primarily a hardware company and our software support is limited Please consi
3. 6 CONNECTORS AND PINOUT 6 Introduction to the chapter In this chapter are presented the connectors that can be found on the board all together with their pinout and notes about them Jumpers functions are described Notes and info on specific peripherals are presented Notes regarding the interfaces are given 6 1 UEXT module MOD RS485 ISO board has UEXT connector and can interface Olimex s UEXT modules The signals for this board are set in DEVICE mode Without modification it can connect directly to board s which UEXT is set in HOST mode For more information on UEXT please visit https www olimex com Products Modules UEXT resources UEXT pdf UEXT connector ee eee Not connected Not connected Not connected a a ES eT Ea Page 12 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual 6 2 X1 and X2 RS485 connectors These are the connectors forming the RS485 RS422 communication mean Switching the jumpers can define the protocol to either HALF or FULL DUPLEX mode The default mode is HALF DUPLEX mode Please notice that the signal names of X1 and X2 can be found printed on the bottom of the board under the blue connectors picture of those below X1 and X2 connectors 6 3 ICSP connector Used for programming the PIC chip with a programmer The step of the connector is 2 54mm the bigger one ICSP connector pape fe Cp p e fe Cope E Page 13 of 20 OLIMEX 2012 MOD RS485 ISO User s
4. E MOD RS485 ISO THEY ARE CONSIDERED SUITABLE ONLY FOR MOD RS485 ISO Page 2 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual Table of Contents LAV To OAT DP Tih CGA 2 aera Se POP rn me ee eee ee 2 CHAPTER 1 OVERVIEW cccsissstisiscsssiss scsssssvssdstsosasssbosssedessiisse i uecsaddns sidoin iaso 5 1 Introduction tothe chapter rassis aiaa aaa 5 CHAPTER 4 THE ISOT35 TRANSCEIVER AND THE PIC16F1503 9 A Introduction to the Chapter ccccccccccscscsssssssssssssssssssssssccscccscccscscscssssssssssssssscsssssossssssseseees 9 VG US ODS Jesna iacaa eiaa aaa a aa E ea 9 42 The PICIGFI DOS Arnie aiaee aaa a aaa a ea aaa E 10 CHAPTER 5 CONTROL CIRCUITY essssssessssosscsoseccscccsecceccscosccsececosceeceessesee 11 5 Introduction to the chapte cciias aaa o e aaea ioaea isarat iaaa ii 11 CHAPTER 7 SCHEMATIC S ociiiisiirsssisvoisivsovocsorudssons ose osi ainoa ccuas iune vi siou vb visait 15 7 Introduction to the Chapter sscccccccssssssesssccsssccsssssensssccsccsscssssccssscccssccssssscnsssscescessccssoees 15 Page 3 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual Page 4 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual CHAPTER 1 OVERVIEW 1 Introduction to the chapter Thank you for choosing the MOD RS485 ISO optically isolated RS485 interface from Olimex This document provides a user s guide for the MOD RS485 ISO extension board As an overview this cha
5. Manual 6 4 Jumper description Please note that all the jumpers on the board are PTH type For easier access use pincers 6 4 1 PROG The PROG jumper controls the I2C address given If closed it will receive new I2C address If open the board will not receive I2C address Check the available examples and the text files in them for further info The default position is closed 6 4 2 Z B Y A These jumpers must be moved together When both are closed ISOT35 s pin 11 and 14 are connected and also pins 12 and 13 are connected which means the module is in HALF DUPLEX mode To enter FULL DUPLEX mode disconnect both jumpers The default positions are closed 6 5 Additional hardware components The components below are mounted on MOD RS485 ISO but are not discussed above They are listed here for completeness Reset button used to reset the board Page 14 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual CHAPTER 7 SCHEMATICS 7 Introduction to the chapter In this chapter are located the schematics describing logically and physically MOD RS485 ISO 7 1 Eagle schematic MOD RS485 ISO schematic is visible only for reference here You can also find it on the MOD RS485 ISO s GitHub repository https www olimex com Products Modules Interface MOD RS485 resources MOD RS485 schematic pdf They are located in HARDWARE section The EAGLE schematic is situated on the next page for quicker reference Page 15 of 20 OLIME
6. X 2012 MOD RS485 ISO User s Manual www olimex com 3 3V_ISO RAO ANO C1IN DACOUT1 ICSPDAT RA1 AN1 VREF C1INO C2IN0 ICSPCLK RA2 AN2 C1OUT DACOUT2 TOCKVINT PWVB CLC1 CWG1FLT l TB3 5Mm RA3 CLCIINOVPPITIGISS MCLR NACINA 48 mini melt 2 3 RA4 ANB NCO1 SDO CLKOUTIT1G RESET 2 2 RAS CLKINT1CKVINCO1CLK CLC1IN1 2 1 X1 3 1 2 1 1 TB3 5mm ROO AN4 C2IN CLC2 SCL SCK RC1 ANS C1IN1 C2IN1 PWWM4 NCO1 1 SDA SDI RC2 AN6 C1 IN2 C2IN2 SDO RC3 AN7 C1IN3 C2IN3 PYVIV2 CLC2 INO RC4 C2OUT CLC2IN1 CWG1B RCS PWM1 CLC1 CWG1A R5 PIC16F1503 I SL 390R 1 ff T1107A 6x3 8x2 5mm VR1 3 3V 1N5819S SS 14 LM1117IMPX ADJ oT 7 ol o D2 10uF 16V BER SF 782485 35C 41N5819S SS14 RESET R3 H 100nF C6 10uF 10V R2 NA 4 7k ICSPDAT RxD ICSPCLK SDA uo p J OLIMEX LTD BULGARIA Page 16 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual 7 2 Physical dimensions Note that all dimensions are in mils foooocon al _ fam z o D Ue ra Cex The three highest elements on the board in order from the tallest to the shortest are ICSP connector 450mils RS485 connector 400mils UEXT connector 350mils 18 ro r YN CO vd 200000 10 O90 00 Oo00000 Page 17 of 20 OLIMEX 2
7. ained in this document are given by OLIMEX in good faith However all warranties implied or expressed including but not limited to implied warranties of merchantability or fitness for purpose are excluded This document is intended only to assist the reader in the use of the product OLIMEX Ltd shall not be liable for any loss or damage arising from the use of any information in this document or any error or omission in such information or any incorrect use of the product This evaluation board kit is intended for use for engineering development demonstration or evaluation purposes only and is not considered by OLIMEX to be a finished end product fit for general consumer use Persons handling the product must have electronics training and observe good engineering practice standards As such the goods being provided are not intended to be complete in terms of required design marketing and or manufacturing related protective considerations including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards Olimex currently deals with a variety of customers for products and therefore our arrangement with the user is not exclusive Olimex assumes no liability for applications assistance customer product design software performance or infringement of patents or services described herein THERE IS NO WARRANTY FOR THE DESIGN MATERIALS AND THE COMPONENTS USED TO CREAT
8. der reading the paragraph below about the warranty of Olimex products Warranty and returns Our boards have lifetime warranty against manufacturing defects and components During development work it is not unlikely that you can burn your programmer or development board This is normal we also do development work and we have damaged A LOT of programmers and boards during our daily job so we know how it works If our board programmer has worked fine then stopped please check if you didn t apply over voltage by mistake or shorted something in your target board where the programmer was connected etc Sometimes boards might get damaged by ESD shock voltage or if you spill coffee on them during your work when they are powered Please note that warrany do not cover problems caused by unproper use shorts over voltages ESD shock etc If the board has warranty label it should be not broken Broken labels void the warranty same applies for boards modified by the customer for instance soldering additional components or removing components such boards will be not be a subject of our warranty If you are positive that the problem is due to manufacturing defect or component you can return the board back to us for inspection When we receive the board we will check and if the problem is caused due to our fault and we will repair replace the faulty hardware free of charge otherwise we can quote price of the repair Note that all shippings bac
9. k and forth have to be covered by the customer Before you ship anything back you need to ask for RMA When you ship back please attach to it your shipping address phone e mail RMA and brief description of the problem All boards should be sent back in antistatic package and well packed to prevent damages during the transport Page 20 of 20
10. pter gives the scope of this document and lists the board s features The document s organization is then detailed Using MOD RS485 ISO you can easily interface our development boards with UEXT on one side and industrial networks with RS485 interface metering instruments etc on the other 1 1 Features ISO35T converter from Texas Instruments UEXT connector with UEXT cable in package RS485 connector full duplex convertible to half duplex via PTH jumpers ICSP connector for reprogramming the firmware FR 4 1 5 mm soldermask component print Dimensions 58x30 mm 2 3 x 1 2 1 2 Target market and purpose of the board The board is a good solution for people who already have an Olimex board but need to communicate with their target using RS485 RS422 interface Due to its compact size price and the 3kV isolation MOD RS485 is a very solid choice when used in harsh environment 1 3 Board variants MOD RS485 unlikely MOD RS485 ISO it is only half duplex no galvanic isolation no ICSP for easier programming different chip than the ISO version of course it costs less Page 5 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual 1 4 Organization Each section in this document covers a separate topic organized as follow Chapter 1 is an overview of the board usage and features Chapter 2 provides a guide for quickly setting up the board and software notes Chapter 3 contains the general board diagram and layout Chapter 4 desc
11. red either via the UEXT or via the ICSP Check the software section of the web page of the board for code examples Page 7 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual CHAPTER 3 MOD RS485 ISO BOARD DESCRIPTION 3 Introduction to the chapter Here you get acquainted with the main parts of the board Note the names used on the board might differ from the names used below to describe them For the actual names check the MOD RS485 ISO board itself 3 1 Layout top view JUMPER PROG MOD R ReV A WWW OLIMEX COM DEV RESET DUPLEX JUMPERS X2 The picture above shows the initial revision of MOD RS485 ISO Page 8 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual CHAPTER 4 THE ISOT35 TRANSCEIVER AND THE PIC16F1503 4 Introduction to the chapter In this chapter is located the information about the heart of MOD RS485 ISO the Texas Instruments The information is a modified version of the datasheet provided by its manufacturers 4 1 The ISOT35 The ISO35T is an isolated differential line transceiver with integrated oscillator outputs that provide the primary voltage for an isolation transformer The device is a full duplex differential line transceiver for RS 485 and RS 422 applications that can easily be configured for half duplex operation by connecting pin 11 to pin 14 and pin 12 to pin 13 3000VRMS 4242VPK Isolation Bus Pin ESD Protection 16 kV HBM Between Bus Pins and GND2 6kV HBM Between Bu
12. ribes the components that are the heart of the board the ISOT35 transceiver and the PIC16F1503 Chapter 5 is an explanation of the control circuitry associated with the microcontroller to reset Also shows the clocks on the board Chapter 6 covers the connector pinout peripherals and jumper description Chapter 7 provides the schematics Chapter 8 contains the revision history useful links and support information Page 6 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual CHAPTER 2 SETTING UP THE MOD RS485 ISO BOARD 2 Introduction to the chapter This section helps you set up the MOD RS485 ISO development board for the first time Please consider first the electrostatic warning to avoid damaging the board then discover the hardware and software required to operate the board The procedure to power up the board is given and a description of the default board behavior is detailed 2 1 Electrostatic warning MOD RS485 ISO is shipped in a protective anti static package The board must not be exposed to high electrostatic potentials A grounding strap or similar protective device should be worn when handling the board Avoid touching the component pins or any other metallic element 2 2 Requirements In order to set up the MOD RS485 ISO optimally the following items are required Olimex host board with UEXT connector advisably a PIC one since you can program both with 1 programmer 2 3 Powering the board The board can be powe
13. s Pins and GND1 1 8 Unit Load Up to 256 Nodes on a Bus Designed for RS 485 and RS 422 Applications Signaling Rates up to 1 Mbps Thermal Shutdown Protection Typical Efficiency gt 60 ILOAD 100 mA Low Driver Bus Capacitance 16 pF Typ 50 kV ps Typical Transient Immunity UL 1577 IEC 60747 5 2 VDE 0884 Rev 2 Fail safe Receiver for Bus Open Short Idle Logic Inputs are 5 V Tolerant It is strongly recommended to check the chip s web page at the following web address http www ti com lit ds symlink iso35t pdf for electrical characteristics Page 9 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual 4 2 The PIC16F1503 The PIC controls the input signals for the board and leads them to the transceiver More info about the Microchip s processor can be found here http ww1 microchip com downloads en DeviceDoc 41607A pdf Page 10 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual CHAPTER 5 CONTROL CIRCUITY 5 Introduction to the chapter Here you can find information about reset circuit and quartz crystals locations the power supply circuit is discussed 5 1 Reset The reset line includes R4 4 7k C1 4 7 nF R5 390R reset button and processor pin 4 MCLR 5 2 Clocks There is no quartz crystal mounted on the board 5 3 Power supply circuit The board is powered either by pin 2 of the ICSP connector or pin 1 of the UEXT connector Page 11 of 20 OLIMEX 2012 MOD RS485 ISO User s Manual CHAPTER
Download Pdf Manuals
Related Search