SerCAN-ARM7 User Manual - EMS
Contents
1. SeriallCAN Gateway SerCAN ARM7 RMD User Manual Serial CAN Gateway SerCAN ARM7 RMD User manual SerCAN ARM7 RMD Document version 1 03 Documentation date May O5th 2011 This document describes the functionality of the SerCAN ARM7 RMD hardware with firmware version 2 00 Please contact EMS Dr Thomas W nsche if you have a module with different firmware No part of this document or the software described herein may be reproduced in any form without prior written agreement from EMS Dr Thomas W nsche For technical assistance please contact EMS Dr Thomas W nsche Sonnenhang 3 D 85304 IImm nster Tel 49 8441 490260 Fax 49 8441 81860 Our products are continously improved Due to this fact specifications may be changed at any time and without announcement WARNING EMS hardware and software may not be used in applications where damage to life health or private property may result from failures in or caused by these components 2 EMS Dr Thomas W nsche SerCAN ARM7 RMD Content 1 Overview 1 1 Features 1 2 General Description 1 3 Ordering Information 2 Handling 2 1 Connection 2 2 Operation 2 3 Configuration 2 3 1 Configuration File 2 3 2 Programming the Device 2 4 LED 3 Technical Data 3 1 Pin Assignment 3 2 Limiting Values 3 3 Nominal Values 4 Appendix 4 1 Configuration File Example 4 2 Standard CAN Baud Rates EMS Dr Thomas W nsche Serial CAN Gateway NNN aaa u Seria2. The RS232 interface has a standard SUB D 9 male connector and is used for normal operation as well as for the configuration purpose The connector assignment of the multiway connector and the RS232 interface is described in chapter 3 1 Pin assignment Operation To start up the gateway just connect the power supply the device starts up automatically As soon as the automatic diagnostic process is successfully completed the green power LED lites up permanently Important note Ex factory the device offers no configuration and must be configured before its first run Configuration instructions for the gateway are located in chapter 2 3 Configuration Configuration The gateway configuration process consists of two steps e Creating a configuration file e Loading the configuration into the device 2 3 1 Configuration File The configuration file is a text file with the extension gcf This file holds all data needed by the gateway for operation A complete sample configuration is located in chapter 4 1 Configuration File Example The values can either be entered in decimal or hexadecimal notation Using the hexadecimal notation the character x has to be entered directly before the particular value EMS Dr Thomas W nsche Serial CAN Gateway SerCAN ARM7 RMD Some parameters are optional If they are not defined the gateway uses default settings In the following all parameters are listed and described com
3. indicated by the type field Denotes a CAN message with 11bit identifier XCAN Denotes a CAN message with 29bit identifier A message block of type CAN has the following structure data frame Number of low byte first OxFF RTR frame data bytes corresponding Ox7F data frame to Length RTR frame 0 bytes A message block of type XCAN has the following structure 1 byte data frame Number of low byte first OxFF RTR frame data bytes corresponding Ox7F data frame to Length RTR frame 0 bytes EMS Dr Thomas W nsche 17 Serial CAN Gateway SerCAN ARM7 RMD THIS PAGE INTENTIONALLY LEFT BLANK 18 EMS Dr Thomas W nsche SerCAN ARM7 RMD Serial CAN Gateway THIS PAGE INTENTIONALLY LEFT BLANK EMS Dr Thomas W nsche 19
4. 0 Baud 26 The line settings for the RS232 interface is always 8 data bits no parity 1 stop bit 8N1 The maximum usable baud rate is limited by the serial transceiver chip to 115200 baud Please note that if a serial baud rate is programmed which is not supported by the PC used for the configuration process a reconfiguration may become hard to accomplish Example serial baud rate set to 57600 serialbaudrate 52 EMS Dr Thomas W nsche 9 Serial CAN Gateway SerCAN ARM7 RMD bus off bus off behavior This key specifies the period of time in milliseconds which will pass by until the gateway gets bus on again after a bus off condition has occured If this value is not defined the device remains in bus off state If a bus off time of O milliseconds is set the gateway tries immediately to get bus on again Example busoff 100 Sfilter xfilter filter key This key defines which received CAN messages will be filtered out or not Either a particular identifier or a range of identifiers can be specified Amessage which should pass to the RS232 interface must have a filter rule set The sfilter key relates to 11bit identifier messages whereas xfilter relates to 29bit identifier Example A range of 11bit messages starting with id and ending with id 100h will pass the filter sfilter x0 x100 A range of 29bit messages starting with id 100h and ending with id 1000h will pass the filter xfilter x0 x10
5. 2 3 2 Programming the Device SerCAN ARM7 is programmed by means of the configuration software It offers the possibility to configure the gateway via the RS232 interface A nullmodem cable has to be used to connect to the host PC The Program Settings have to be set to e SerCAN ARM7 RMD e Program configuration e a configuration file 10 EMS Dr Thomas W nsche SerCAN ARM7 RMD Serial CAN Gateway The Interface Settings have to be set to e Use RS232 interface e the used PC serial interface port e the serial baudrate used by the SerCAN ARM7 device Within the Device Settings the serial number of the SerCAN ARM7 has to be set The serial number can be found on a label on the rear side of the device After all settings are made a click on the Process button starts the download Do not remove power from the device until the process has finished Screenshot of the download tool E wxFlasher EMS Firmware and Configuration Programmer Dj xj Program Settings Interface Settings SercAN ARM7 RMD gt Use RS232 interface C Use CAN interface Program firmware Program configuration com 7 Interface C Dokumente und Einstellungen someb Fr 57600 Bitrate Device Settings Incoming Program Identifier 7 Extended Frame Forn Outgping Program Identifier 7 Extended F Fi Serial Number 123 Read configuration EMS Dr Thomas W nsche 11 Serial CAN Gateway SerCAN ARM7 RMD 2 4
6. LED 12 The device status is displayed by three LEDs Power The device is CAN bus on and in normal operation mode The device is CAN bus off Blinking The device is in programming mode CAN Active There is CAN bus activity There is no CAN bus activity EMS Dr Thomas W nsche SerCAN ARM7 RMD Serial CAN Gateway 3 Technical Data 3 1 Pin Assignment Pin Assignment multiway connector SerCAN ARM7 RMD je leno foome Connected with Pin 4 by a 5k6 resistor and RTH pin of TJA1054 CAN transceiver Connected with Pin 5 by a 5k6 resistor and RTL pin of TJA1054 CAN transceiver internal connected EMS Dr Thomas W nsche 13 Serial CAN Gateway SerCAN ARM7 RMD Pin assignment RS232 Pin Signal Description notconnected i RxD TO Transmit signal o a1 notcomeced enD Ground S e notconnected e lets notused o e ntcomecea 3 2 Limiting Values Parameter Min Max unit Storage temperature 20 Iso fe Operating temperature feo fe 3 3 Nominal Values Parameter Min _ Max Unit 14 EMS Dr Thomas W nsche SerCAN ARM7 RMD Serial CAN Gateway 4 Appendix 4 1 Configuration File Example Serial CAN Gateway SerCAN ARM7 configuration file Version number of configuration file version 1 CAN baud rate set to 500kBaud canbaudrate x001C0005 RS232 baud rate set to 57 6 kBaud serialbaudrate 52 set CAN bus off recovery time to 500ms busoff 500 filter settin
7. gs all 11bit CAN identifier are routed sfilter x0 x7FF all 29bit CAN identifiers are routed xfilter x0 xiLFFFFFFF 4 2 Standard CAN Baud Rates EMS Dr Thomas W nsche 15 Serial CAN Gateway SerCAN ARM7 RMD 4 3 Serial Protocol Specification 16 A block oriented protocol is used for message exchange between RS232 and CAN Format of a data block Start type Lengtn Data 2 Ichecksumlend The length byte counts the number of bytes in the fields type length data and checksum The two checksum bytes contain the byte by byte summarization of the fields type length and data A number of special characters are used Reserved characters have values less or equal 7 The following three special characters are used Special character Value Description BEGINOFDATA Marks the start of a block ENDOFDATA Marks the end of a block ESCAPE 0x02 The following character is no special character This allows the transmission of special characters in the fields type length data and checksum In case that a special character has to be transmitted within the data field it must be preceeded by an ESCAPE character and the most significant bit of the character has to be set Example Transmission of 0x01 Transmitted is 0x02 ESCAPE followed by 0x81 0x01 0x80 EMS Dr Thomas W nsche SerCAN ARM7 RMD Serial CAN Gateway The meaning of the bytes in the data field is
8. l CAN Gateway SerCAN ARM7 RMD THIS PAGE INTENTIONALLY LEFT BLANK 4 EMS Dr Thomas W nsche SerCAN ARM7 RMD Serial CAN Gateway 1 Overview 1 1 Features e Connection of a CAN network to a RS232 interface e Filtering of CAN messages e CAN bus activity displayed by LED e Configuration via RS232 connection e Wiring using a multiway connector e Available also with low speed CAN transceiver NXP TJA1054 1 2 General description The Serial CAN gateway SerCAN ARM7 connects a CAN network to a RS232 interface The capability of having different baud rates on the CAN side as well as on the RS232 side marks the devices a versatile tool for a lot of applications Bandwith differences between CAN and RS232 may be overcome by CAN message filtering The device is also available with a low speed physical CAN interface using NXP CAN transceiver TJA1054 SerCAN ARM7 RMDILS The device is configured via the RS232 interface Due to the intuitive structure of the configuration file in ASCII format programming and administration is easy 1 3 Ordering information 12 20 202 20 SerCAN ARM7 RMD 12 20 203 20 SerCAN ARM7 RMD LS EMS Dr Thomas W nsche 5 Serial CAN Gateway SerCAN ARM7 RMD THIS PAGE INTENTIONALLY LEFT BLANK 6 EMS Dr Thomas W nsche SerCAN ARM7 RMD Serial CAN Gateway 2 2 1 2 2 2 3 Handling Connection SerCAN ARM7 has a multiway connector for flexible wiring of the CAN interface and the power supply
9. ment The configuration file can be provided with comments Comments are prefaced with the character and they end with the particular line Example 1st comment key value 2nd comment version version The version number indicates the file format of the configuration file It must be 1 for the actual version Example version 1 configname name assigned to the configuration For easier identification of the programmed settings the configration can be labeled The configuration name must not have more than 32 characters and must not contain space characters or tabs If this key is missing no name will be assigned Example configname MyOwnConfig 8 EMS Dr Thomas W nsche SerCAN ARM7 RMD Serial CAN Gateway canbaudrate CAN bit timing The CAN bit timing key indicates the speed of the CAN interface This key is mandatory and is related directly to the CANBTRO register of the used controller LPC2119 This allows most flexible customization of the baudrate settings The basic CAN clock is A8MHz Example 500 kBaud canbaudrate x001c0005 serialbaudrate serial baud rate The serial baudrate key is optional If it is not set the default baudrate of 57600 baud will be used A particular value is calculated with the following equation serialbaudrate 48000000 16 BAUDRATE The results for some standard values are given below 9600 Baud 312 19200 Baud 156 38400 Baud 78 57600 Baud 52 11520
Download Pdf Manuals
Related Search