BeagleBone RS232 Cape
Contents
1. 17 17 5 9 HART 18 54 WARTOTORS232 nece ise ette tu irte epe exeo creto eese ete 18 5 97 AT A 19 5 5 1 EEPROM Addk633 iier treo eee 20 MEN OPI CHEER 20 6 0 MECHANICAL INFORMATION eee e eee een nnne eate tna s ases e tatnen asses e ases 21 7 0 DESIGN EVUDH EVE 22 beagleboardtoys com Page 6 of 22 BeagleBone RS232 Cape System Reference Manual Revision A Figures Figure 1 The BeasleBone RS232 Cape aue en 11 biis Key Components sessenta 15 Figure 3 BeagleBone RS232 Cape High Level Block Diagram 17 Figure 4 gt BeagleBone RS232 UART Selection eene 18 Fis re s B esiti diii ore eer eons een a o ere ne ee 19 Figure 6 BeagleBone RS232 Cape 20 Figure 7 BeagleBone RS232 Cape Dimensions Drawing eee 21 Tables Tablet Change Hist ry lo ditt tonta Docs but 10 Table 2 BeagleBone RS232 Cape Features eei esie 14 beagleboardtoys com Page 7 of 22 BeagleBone RS232 Cape System Reference Manual Revision A NOTES Page 82. the board kit may be returned within 30 days from the date of delivery for a full retund THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED IMPLIED OR STATUTORY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE The user assumes all responsibility and liability for proper and safe handling of the goods Further the user indemnifies BeagleBoardtoys com from all claims arising from the handling or use of the goods Due to the open construction of the product it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES BeagleBoardtoys com currently deals with a variety of customers for products and therefore our arrangement with the user is not exclusive BeagleBoardtoys com assumes no liability for applications assistance customer product design software performance or infringement of patents or services described herein Please read the User s Guide and specifically the Warnings and Restrictions notice in the User s Guide prior to handling the product This notice contains important safety information about temperatures and voltages For additional information on BeagleBoardtoys com environmental and or safety programs pl
3. Line Driver Receiver Figure 2 Key Components 4 2 RS232 Interface The BeagleBone RS232 Cape uses the SN65C322EPW to provide an RS232 serial interface for BeagleBone SN65C322EPW features one line driver and one line receiver to translate data from RS232 level to UART level and vice versa The RS232 signals are connected to TX and RX pins of D Sub9 serial connector on the board The UART signals are connected to four different UART ports on the BeagleBone via selection jumpers PR Page 15 of 22 BeagleBone RS232 Cape System Reference Manual Revision A 43 UART Selection The BeagleBone RS232 Cape provides an option for users to choose among four UART ports from AM335x UARTI 2 4 and 5 The and signals are connected to the corresponding signal of each UART via jumper headers The default selection is UART 2 If one wishes to use a UART port ensure the jumper for that port is installed 4 4 Power Indicator The BeagleBone RS232 Cape features an LED D3 to indicate that power is applied to the cape This LED is green when lit 4 5 Mechanical Specifications Size 4 00 x 2 50 Layers 4 PCB thickness 062 RoHS Compliant Yes 4 6 X Electrical Specifications Table 3 is the electrical specification of the external interfaces to the BeagleBone RS232 panel Table 3 RS232 Electrical Specifications Specification Min Typ Max Unit Power Input
4. Voltage DC 3 3 V Environmental Temperature range 0 85 Page 16 of 22 BeagleBone RS232 Cape System Reference Manual Revision A 5 0 System Architecture and Design This section provides a high level description of the design of the BeagleBone RS232 Cape and its overall architecture 51 System Block Diagram Figure 3 is the high level block diagram of the BeagleBone RS232 Cape E X P A N S o 2 UART5 N 5 R 1 LINE DRIVER RECEIVER A BUFFER UA 2 5232 L 2 UART1 UART m E x U27 SN65C3221EPW o 74LVC1G126 N A 2 UART2 N N 5 J1 1 o 2 UART4 N RESET C e EEPROM N 2 i 05 12 2 1 CAT24C256W Figure 3 BeagleBone RS232 Cape High Level Block Diagram 5 2 RS232 The BeagleBone RS232 Cape uses a D Sub 9 female serial connector to provide RS232 connection The TX RX and GND signals of RS232 interface are connected to pin 2 3 and 5 of D Sub connector J1 A compatible serial cable is required to communicate via RS232 interface RS232 data are transmitted or received by SN65C322EPW which translate data between UART and RS232 PR beasleboonitoys com Page 17 of 22 BeagleBone RS232 Cape System Reference Manual Revision A 53 UART There are four UART ports available on the expansion header of BeagleBone each of these ports can be used by the RS232 Cape The TXD and RXD signals of SN65C322EPW c
5. the environment variables of UBoot beagleboardtoys com Page 12 of 22 BeagleBone RS232 Cape System Reference Manual Revision A 3 4 Repairs If you feel the board is in need of repair follow the RMA Request process found at http www beagleboardtoys com support rma Do not send the board in for repair until an RMA authorization has been provided Do not return the board to the distributor unless you want to get a refund You must get authorization from the distributor before returning the board PR veogleboordhoy com Page 13 of 22 bey gt BeagleBone RS232 Cape System Reference Manual Revision A 4 0 Features and Specifications This section covers the specifications of the BeagleBone RS232 Cape and provides a high level description of the major components and interfaces that make up the board Table 2 provides a list of the BeagleBone RS232 Cape s features Table 2 BeagleBone RS232 Cape Features UARTI Compatible UART2 default Serial Port UARTS Power 3 3 V via expansion header Indicator Power LED Two 46 position connectors Connector One 10 position connector One D Sub9 serial connector beagleboardtoys com Page 14 of 22 BeagleBone RS232 Cape System Reference Manual Revision A 41 Key Component Locations Figure 2 shows the location of the key components on the board UART TX Jumpers F F7 UART RX Jumpers Buffer E301546 S9QiCMASA D 1225
6. BeagleBone RS232 Cape System Reference Manual Revision A1 August 10th 2012 BeagleBone RS232 Cape System Reference Manual Revision A THIS DOCUMENT This work is licensed under the Creative Commons Attribution Share Alike 3 0 Unported License To view a copy of this license visit http creativecommons org licenses by sa 3 0 or send a letter to Creative Commons 171 Second Street Suite 300 San Francisco California 94105 USA All derivative works are to be attributed to BeagleBoardtoys com For more information see http creativecommons org license results one license_code by sa For any questions concerns or issues submit them to support beagleboardtoys com BEAGLEBONE RS232 CAPE DESIGN These design materials referred to in this document are NOT SUPPORTED and DO NOT constitute a reference design Only community support is allowed resources at Beagleboardtoys com support THERE IS NO WARRANTY FOR THE DESIGN MATERIALS TO THE EXTENT PERMITTED BY APPLICABLE LAW EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND OR OTHER PARTIES PROVIDE THE DESIGN MATERIALS AS IS WITHOUT WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE THE beagle o gt toys com Page 2 of 22 AR e BeagleBone RS232 Cape System Reference Manual Revision A ENTIRE RISK AS TO TH
7. E QUALITY AND PERFORMANCE OF THE DESIGN MATERIALS IS WITH YOU SHOULD THE DESIGN MATERIALS PROVE DEFECTIVE YOU ASSUME THE COST OF ALL NECESSARY SERVICING REPAIR CORRECTION We mean it these design materials may be totally unsuitable for any purposes beagleboardtoys com Page 3 of 22 BeagleBone RS232 Cape System Reference Manual Revision A BeagleBoardToys provides the enclosed product s under the following conditions This evaluation board kit is intended for use for ENGINEERING DEVELOPMENT DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by BeagleBoardtoys com to be a finished end product fit for general consumer use Persons handling the product s 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 This evaluation board kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility restricted substances RoHS recycling WEEE FCC CE or UL and therefore may not meet the technical requirements of these directives or other related directives Should this evaluation board kit not meet the specifications indicated in the User s Guide
8. T i SW DIP 2 CAT24C256W 1 lt R123 7 TP2 DGND Figure 6 BeagleBone RS232 Cape EEPROM 5 5 1 EEPROM Address In order for each Cape to have a unique address a board ID scheme is used that sets the address to be different depending on the order in which it is stacked onto the main board A two position dipswitch or jumpers is used to set the address pins of the EEPROM It is the responsibility of user to set the proper address for each board Address line A2 is always tied high This sets the allowable address range for the expansion cards to 0x54 to 0 57 other I2C addresses can be used by the user in the design of their Capes But these addresses must not be used other than for the board EEPROM information 5 5 2 I2C Bus The EEPROMs on each expansion board is connected to I2C2 For this reason I2C2 must always be left connected and should not be changed by SW to remove it from the expansion header pin mux The D2C signals require pull up resistors Each board must have a 5 6K resistor on these signals With four resistors this will be an affective resistance of 1 4K if all Capes were installed PR beasleboonitoys com Page 20 of 22 A BeagleBone RS232 Cape System Reference Manual Revision A 6 0 Mechanical Information This section provides information on the mechanical aspect of the BeagleBone RS232 Cape Figure 7 is th
9. able 1 tracks the changes made for each revision of this document Table 1 Change History Rv Chmgs Date AH La SN f 4 beagleboardtoys com Page 10 of 22 BeagleBone RS232 Cape System Reference Manual Revision A 3 0 BeagleBone RS232 Cape Overview 31 Descriptions The BeagleBone RS232 Cape provides an RS232 interface to the BeagleBone via a standard D Sub 9 female serial connector This connector is located to the side so it doesn t interfere with any capes stacked above it By default the BeagleBone RS232 Cape uses UART2 port on the AM335x for RS232 connection however users will have the freedom to choose among UARTI UART2 and UARTS ports Figure 1 below is a picture of the board Figure 1 The BeagleBone RS232 Cape PR Page 11 of 22 BeagleBone RS232 Cape System Reference Manual Revision A 3 2 In The Box The final packaged BeagleBone RS232 Cape Rev product will contain the following items 1 BeagleBone RS232 Cape 1 Wiki information card 3 3 Getting Started Following the instructions below to start using your BeagleBone RS232 Cape 1 Mount the BeagleBone RS232 on top of BeagleBone 2 Make sure the micro SD card using with BeagleBone has latest Angstrom image 3 Connect the BeagleBone RS232 Cape to the computer using a RS232 compatible serial cable Remember the port number of this connection Note In Windows the se
10. an be connected to the corresponding signals of UARTI 2 4 and 5 by installing jumpers for that signal The default connection is UART2 This UART port is also supported by software If user wishes to use a different UART port the TX and RX jumpers for that port are required to be installed User will also need to rebuild the kernel to support that UART port in software A buffer is used to ensure the UART signals do not conflict with BeagleBone s booting process Figure 4 shows the UART selection circuit on the RS232 Cape J29 UARTS lt O gt 25 228 1 2 L UART lt O eT 25 O 2345 UART2 25 226 UART4 TXD lt gt 25 VDD 226 1 2 24 UARTS RXD gt G O 1uF 10V 25 224 D ND UARTI_RXD lt gt H u27 25 5 4 y A EQ UART RXD 3 GND 8 UART2 RXD lt gt 1 2 74LVC1G126DBV 25 222 UART4 RXD 116 of2 Figure 4 RS232 Cape UART Selection 5 4 UART to RS232 The BeagleBone RS232 Cape features an SN65C322EPW to translate data from RS232 level to UART level SN65C322EPW is a single channel line driver and receiver that can operate from 3 3V to 5V RX signal of RS232 interface from the D Sub 9 serial PR beaslebooritoys co
11. e dimensions of the BeagleBone RS232 Cape 70 2 45 mmama 3 40 Figure 7 BeagleBone RS232 Cape Dimensions Drawing Page 21 of 22 b Y BeagleBone RS232 Cape System Reference Manual Revision A 7 0 Design Materials Design information can be found at BeagleBoardToys wiki http beagleboardtoys com wiki index php title BeagleBone_RS232 Provided there is Schematic in PDF Schematic in OrCAD Manufacturing files o PCB Gerber o PCB Layout Allegro of Materials System Reference Manual This document These design materials are SUPPORTED and DO NOT constitute reference design Only community support is allowed via resources at BeagleBoard org discuss THERE IS NO WARRANTY FOR THE DESIGN MATERIALS TO THE EXTENT PERMITTED BY APPLICABLE LAW EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND OR OTHER PARTIES PROVIDE THE DESIGN MATERIALS AS IS WITHOUT WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE DESIGN MATERIALS IS WITH YOU SHOULD THE DESIGN MATERIALS PROVE DEFECTIVE YOU ASSUME THE COST OF ALL NECESSARY SERVICING REPAIR OR CORRECTION We mean it these design materials may be totally unsuitable for any purposes beagleboardtoys com Page 22 of 22
12. ease contact visit BeagleBoardtoys com No license is granted under any patent right or other intellectual property right of BeagleBoard org covering or relating to any machine process or combination in which such BeagleBoardtoys com products or services might be or are used Mailing Address Beagleboardtoys com 1380 Presidential Dr 100 Richardson TX 75081 U S A jc Page 4 of 22 A BeagleBone RS232 Cape System Reference Manual Revision A WARRANTY The BeagleBone RS232 Cape is warranted against defects in materials and workmanship for a period of 90 days from purchase This warranty does not cover any problems occurring as a result of improper use modifications exposure to water excessive voltages abuse or accidents All boards will be returned via standard mail if an issue is found If no issue is found or express return is needed the customer will pay all shipping costs Before returning the board please visit Beagleboardtoys com support To return a defective board please request an RMA at http www beagleboardtoys com support rma PR beaslebooritoys com Page 5 of 22 BeagleBone RS232 Cape System Reference Manual Revision A Table of Contents JU GUI HO EE 7 7 10 INTRODUCTION Rm 9 2 0 CHANGE HISTORY sisi sssescssseiecsecsvssesscscsssseesosavesssosecseesnsesssscvbecesocnsessvounseccoesossssuosssccseesosecenes
13. esaceveevaee 10 2 1 CHANGE HISTORY sisccsicccncscsscicecenecavccsessacceacesdcctecesascdescoascenscsasceacecaccdedseasededensecceedbaccessecencseoseeaecenecs 10 3 0 BEAGLEBONE RS232 CAPE OVERVIEW sssccccscssssssssssscccesssscssscccccssssssseccccsescsscssecescesscssees 11 3 1 DESCRIPTIONS TTE 11 3 2 INTHE BOX 12 33 GETTING TAR 12 vtt vba bes ees eee erasa 12 REPAIRS eripiet M 13 4 0 FEATURES AND SPECIFICATIONS eere ee eee asses e asses e asse sesto 14 4 1 KEY COMPONENT LOCATIONS eee nee n nene nene nr t n nn nn nnn nter Ei E sese senten nnn 15 42 RS232 INTEREAGE dee EAEE EEEE 15 4 3 UAR TL SELECTION ss bie deae EE NER ei 16 44 POWEBRINDICATOR Genesi tte icto cabusdue susesaed AEE EEEREN 16 4 5 MECHANICAL SPECIFICATIONS 16 4 6 ELECTRICAL SPECIFICATION S oerna r aaea aae a e ia e aE 16 5 0 SYSTEM ARCHITECTURE AND DESIGN ssssssssessessoseoeseessosooeoeessosooocesseesoseoseeessososeseessessssoese 17 5 1 SYSTEM BLOCK
14. m Page 18 of 22 BeagleBone RS232 Cape System Reference Manual Revision A connector J1 is received by the SN65C322EPW and transmitted as UART data Similarly UART data from BeagleBone is translated to RS232 before transmitted to the D Sub 9 connector The data signaling rate can go up to 1 Mbps On the BeagleBone RS232 Cape enable signal EN is pulled low and FORCEOFF is high to enable the data translation between RS232 and UART Figure 5 shows SN65C322EPW in RS232 schematic RS232 0 3v3 2 357 UART TXD 2 457 UART RXD Qe v g R42 0 0 DGND Figure 5 UART to RS232 5 5 EEPROM The BeagleBone RS232 Cape has an EEPROM containing information that will allow the SW to identify the board and to configure the expansion headers pins as needed EEPROMs are required for all Capes sold in order for them to operate correctly when plugged in the BeagleBone The EEPROM used on this cape is the same one as is used on the BeagleBone a CAT24C256 The CAT24C256 is a 256 kb Serial CMOS EEPROM internally organized as 32 768 words of 8 bits each It features a 64 byte page write buffer and supports the Standard 100 kHz Fast 400 kHz and Fast Plus 1 MHz protocol Figure 6 is the design of the EEPROM circuit PR beasleboonitoys com Page 19 of 22 BeagleBone RS232 Cape System Reference Manual Revision A VDD_3V3 Board ID EEPROM VDD 3V3 6 I2C2 SCL 6 I2C2 SDA lt
15. of 22 BeagleBone RS232 Cape System Reference Manual Revision A 1 0 Introduction This document is the System Reference Manual for the BeagleBone RS232 Cape an add on board for the BeagleBone This document is intended as a guide to assist anyone purchasing or who are considering purchasing the board to understand the overall design and usage of the BeagleBone RS232 Cape from the system level perspective The design is subject to change without notice as we will work to keep improving the design as the product matures The key sections in this document are Section 2 0 Change History Provides tracking for the changes made to the System Reference Manual Section 3 0 Overview This is a high level overview of the BeagleBone RS232 Cape Section 4 0 Features and Specification Provided here are the features and electrical specifications of the board Section 5 0 System Architecture and Design This section provides information on the overall architecture and design of the BeagleBone RS232 Cape This is a very detailed section that goes into the design of each circuit on the board Section 6 0 Mechanical Information is provided here on the dimensions of the BeagleBone RS232 Cape Section 7 0 Design Materials This section provides information on where to get the design files beagleboardtoys com Page 9 of 22 BeagleBone RS232 Cape System Reference Manual Revision A 2 0 Change History 2 1 Change History T
16. rial port number can be viewed under Ports COM amp LPT section inside Device Manager To open the Device Manager windows right click My Computer choose Properties select the Hardware tab and click Device Manager 4 Connect the BeagleBone to the computer using a USB cable Remember the port number of this connection This will also power up the BeagleBone 5 Open a terminal application Teraterm Hyperterminal etc and open new connection with following settings baud rate 115200 data 8 bit parity none stop 1 bit flow control none Select the port corresponding to the RS232 connection 6 Open a second instance of the terminal application and connect to the USB serial connection using the same settings as above 7 Hitthe reset switch S1 on the BeagleBone The BeagleBone is now rebooting inside the USB serial terminal window 8 Press Enter to stop the booting process at UBoot If missed hit the reset switch again and press Enter before the UBoot count down stops at zero 9 At UBoot run the following commands to temporarily use the RS232 connection setenv console ttyO2 115200n8 boot 10 BeagleBone will continue the booting process however the kernel messages will not show up inside the RS232 terminal window You can now start using the RS232 connection via UART2 Note This RS232 connection is temporary To permanently use the RS232 connection you need to change
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