I²C Bus Tool USER MANUAL
Contents
1. Whilst in the message window the trigger pin can be toggled between high and low by sending Ctrl T characters If trigger input is on then this will be ignored If Trigger on Match is on then it will be switched off Each Ctrl T will toggle the trigger pin between high and low states and show a trigger character of T or t in the message window as happens with trigger input AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMOOI 24 August 2004 Using the supplied OCX windows applications can set the trigger to output pulses on other conditions It can be set to output whenever a message is transmitted by the tool or whenever a slave message is received or transmitted by the tool It also allows the polarity to be changed 6 C Bus Speed The tool is designed to work at bus speeds up to 400kHz However to achieve these speeds it is necessary for the tool to hold the bus for short periods of time to prevent it losing data Whilst monitoring the bus at 400kHz the tool will not slow the bus at all unless the Ack Nack detection is on see section 5 2 above In this case the bus will be held on each byte just before the acknowledge bit for a maximum time of 2us When slave addresses have been set the tool will hold the bus for a longer time at the acknowledge bit for start addresses in order to determine whether or not it is being address2. Pressing one of the number keys from 1 to 8 will cause that messaeg buffer to be transmitted at the next opportunity The message will appear in the normal scrolling display beginning with a capital S to indicate that it originated from the PC Tool 5 4 Master Transmit then Receive Many IC devices require a message to be sent to them followed immediately by a repeated start condition and then an C read from the same device This can be achieved by appending the transmit buffer command with rLL where LL is the length of the data to be received from the slave AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMOOI 24 August 2004 device in hex must be entered as two digits For example to read 4 bytes of data from an EEPROM device that takes a single byte address the transmit buffer would be set up with the command tx1 A0 00 r04 When this buffer is transmitted with the 1 key in the message display mode it will appear as SAO0w00 AT1rFFFFFFFF assuming the device is blank Example commands are tx 1 a040r0A Read 10 bytes of data from EEPROM address 0x40 using transmit buffer 1 tx2 3801ECr03 Send bytes 01 and EC to device at address 0x38 then send a repeated start and read 3 bytes from address 0x39 5 5 Master Receive Request To perform a master receive from an IC device the receive parameters must be set up This is done with the
3. The polarity of the trigger connection can be changed between active high and active low The trigger pin can be set permanently high or low It is possible to configure the trigger as a slave poll request line such that when the application has data to transfer to the master the trigger line is activated and when the master reads the data from the tool it is de activated Similarly when acting as the PC Master device the tool can respond to the trigger line as an input by reading from a slave device The methods and properties for implenting these features of the tool are described in the help file for the OCX which is installed as part of the Software Developer s Kit Examples of using them from Visual Basic and Visual C are also incuded 8 Communication Speeds The baud rate of the PC serial port needs to be high enough to ensure that the received message data can be transferred quickly enough to the PC without the buffer in the FC Tool filling up If the buffer does get full data will be lost and a character will be sent Therefore whenever this character is seen on the display data around it may not be correct If this happens frequently a number of steps can be taken to improve the throughput AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMO01 zah August 2004 e Messages from certain addresses can be filtered out Any message that is fi
4. index html 11 Linux Systems The IC Tool can be used on Linux systems using the MiniCom application This application is shipped with most distributions or can be obtained from http alioth debian org projects minicony The program should be configured to use one of the serial ports e g dev ttyS1 or dev ttyS2 The speed should be set to 115200 8NI It is advisable to delete the modem initialisation string to prevent it sending it when connecting If the colours of the C Tool are to be used then MiniCom colours should be set to a white background and black foreground so that the timestamps are visible When MiniCom is running entering Ctrl A Z will bring up the main menu and option A will switch on the Add Linefeed option which is required to produce the correct display unless the PC Tool option CR LF is switched on 12 Palm Pilot The IC Tool can also be used with Palm devices connected via a modem cable A terminal emulator program called ptelnet formerly PalmTelnet is available from http netpage em com br mmand ptelnet htm Under the Serial menu set the port to Serial the Baud to 115200 parity to N Word to 8 and StopBits to 1 Clear the tick boxes for Xon Xoff and RTS CTS Under the Terminal menu set the Mode to Serial Return to CR and make sure the Local echo tick box is cleared Connect the PC Monitor and press the On button at the bottom left of the screen This should cause the banner to be displayed If the text appear
5. s38wa03alEa 39ra0BaACa3Bnp 942 s38wa03al7a 39ra3FaCla65np 6699 If the command an is used the Tool will just display the NAck conditions with the n character 1 651 s38w0317 39r3EFD4An 1 653 s38w031E 39r0C7927n 1 665 s30w81 1 668 s31r05170002 3049n 1 680 s38w11D3 39r000004n 1 682 s38w031E 39r0A3D18n 1 684 s38w0317 39r3DBD49n 1 686 s38w031E 39r0A935Dn 1 689 sD8w6710 1 690 sD9r1090D010n na a n an n an an wo C1 The Ack NAck display can be turned off with the command a0 5 3 Master Transmit To transmit a message as an I C Master the data to be sent must be set up in a buffer The C Tool has 8 buffers of 32 bytes each Therefore the maximum size of a transmit message is 32 bytes plus the address The buffers are numbered 1 to 8 and the command format is tx 1 8 AA DD DD DD DD Where AA is the address in hex and DD are the data bytes in hex each hex number must be entered as two digits e g 07 not 7 The address and data bytes can be separated by spaces The command must be entered in command mode at the gt prompt Example commands are tx1 A0 00 12 Sets buffer 1 to address AO with data bytes 00 and 12 tx8 300102030405060708090a0b0c0d0e0F Sets buffer 8 for address 30 with data bytes from 01 to OF txl Displays the contents of tx buffer 1 tx Displays the contents of all tx buffers Once the buffers have been set up the messages are sent from the message display mode
6. to one of the conventional COM ports COM Port Input Output Range COMI 03F8 03FF AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMOOI 24 August 2004 COM2 02F8 02FF COM3 03E8 03FF COM4 02E8 02FF To change the allocated port in Windows XP 2000 Display properties of My Computer and select the Device Manager button on the Hardware page Select the device in the list under the Ports COM amp LPT heading View the properties and under the Port Settings tab select the Advanced button The COM port can be selected from this window The USB to serial convertor may need to be disconnected then reconnected for the new port setting to take effect 10 Windows Terminal Programs This manual has referred to the C Bus Monitor and PC Bus Tool being used with the HyperTerminal program that is supplied with Windows operating systems Unfortunately the version that ships with Windows XP has problems with the display of the messages that have scrolled off the top of the screen If you use the scroll bar to view previous messages they do not appear correctly The latest version of HyperTerminal can be downloaded from www hilgraeve com htpe download html Other terminal emulation software is available A trial version of the ZOC terminal emulator from Emtec can be downloaded from www emtec com zoc
7. 0F8 00000000 where the length is given by the byte OxF8 minus OxFO to give a total of 8 bytes 5 6 Slave Transmit The I C Tool can emulate slave devices such as DACs by configuring buffers with data to be sent when it is requested by an PC Master device This is done in the same way as the master transmit buffers are configured but with an odd address tx12A1 0001020304 Configure buffer 1 to send data 00 01 02 03 04 when requested by a master tx2 310000 Configure buffer 2 to send data 00 00 when requested by a master The buffers are searched in reverse order so if two buffers have the same slave address the higher numbered buffer will be used If the master device requests more data than is held in the buffer the IC Tool will send zero bytes until the master terminates the transfer AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMO001 24 August 2004 5 7 Slave Receive The C Tool automatically acknowledges a write operation to an address for which a slave buffer has been configured For example if bufferl is set for address OxA1 the PC Tool will acknowledge address OxAO and any following data bytes 5 8 Baud Rate All transmit and receive operations done as a master cause the I C Tool to generate the I C clock The default for this is 5OkHz It can be set to other values with the commands Command Speed 1
8. 400 400kHz 1200 200kHz 1100 100kHz 150 50kHz 5 9 Trigger Commands The trigger connection Red wire can be set as either an input or output When set as an input it will show rising or falling edges or both in the message display The commands for this are ti Set Trigger as an input to capture rising edges ti Set Trigger as an input to capture falling edges ti Set Trigger as an input to capture rising and falling edges tiO Switch off the trigger input ti Show Trigger input settings The message display shows a character T for rising edges and t for falling edges If these occur during an I C message the characters will be seen within that message If they occur outside a message they will be shown on a separate line with a timestamp if timestamps are enabled s30w81 L t 1 849 s31rT05170002 3049 920 sD8w6710 sD9r1090D010 s30w81 t s31rT05170002 3049 The trigger can be set to output a pulse when a sequence of characters is seen on the bus This uses transmit buffer 8 to store the match sequence so any transmit messages stored in buffer 8 will be lost when a match sequence is set Examples of the command are tm Show trigger match settings tm s300102 Output a trigger pulse when the sequence s30w0102 is seen tm s31FFFECC Output a trigger pulse when the sequence s31rFFFECC is seen tm 300102 Output a trigger pulse when the sequence s30w0102 or 300102 is seen tm0 Switch trigger match off
9. 41103 39r 07FF04 s384031E 39r 000000 38u0317 39r132187 s38u031E 39r 000000 sD8u6 710 s384031E 39r 000000 s384031E 39r 000000 s384031E 39r 000000 s3840317 39r143108 s384031E 39r 000000 gt Connected 0 08 08 ANSI 115200 8 N 1 SCROLL Each line shows a separate message terminated by a Stop condition The s character indicates a start condition The next hexadecimal number is the address and the character after that will be either w for a write operation or r for a read The data section of the message then follows in groups of four bytes all shown in Hex A new line is started when a stop condition is seen on the bus or optionally by a repeated start see section below The character in place of an s indicates a repeated start condition where there was no stop between one message and the next While the messages are scrolling the enter key can be used to insert a blank line This can be useful for marking positions within a sequence of messages HyperTerminal will allow you to scroll back through the messages received but the size of this is limited To record messages HyperTerminal can be configured to capture all the text to a file This can be found under the Transfer Capture Text menu item It will prompt for the filename and once the Start button is pressed all text appearing on the screen will be written to the file To view the file the capture must first be stopped which can be achieved thro
10. AVI TResearch www avitresearch co uk PC Bus Monitor and PC Bus Tool USER MANUAL Document Revision 0 1 Date 24 August 2004 NOTE SMBus is a trademark of Intel Corporation I2C is a trademark of Philips Semiconductor AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMO001 24 August 2004 Overview Monitors bus traffic on C or SMBus systems at up to 400kHz Connects to standard PC serial port or USB to serial adapter No power supply required Compatible with 5 volt and 3 3 volt bus systems Compact all circuitry is integrated within the D Type connector Can be used with standard terminal programs supplied with Windows or Linux Supplied with Windows Software Developer Kit that provides FC data to VB VBA C or Java applications through an OCX Additional features on C Bus Tool e Filters messages according to read or write Sends and Receives messages as an IC Master device Sends and Receives messages as an IC Slave device Capable of transmitting on a Multi Master bus Trigger connection provides an output to an oscilloscope or can be set to an input for timing events Shows acknowledgements ACKs and negative acknowledgements NACKs e Allows VB VBA C or Java applications to transmit on the PC bus through an OCX e Allows user applications to emulate PC peripherals using the OCX 2 Th
11. ave Settings The command S upper case causes the current settings as shown in the above section to be saved into non volatile memory so that they will be used the next time the FC Bus Tool is plugged in 4 9 Baud Rate The baud rate which the C Bus Monitor uses to communicate with the PC is set to 115200 as default It can be changed to any standard rate from 57600 to 921600 to allow it to be used with slower systems or for a greater message throughput The baud rate is set with the command b followed by a number in kbaud e g for a baud rate of 460800 the command would be b460 and the display would appear as gt b460 Baud 460800 A prompt is not shown after the confirmation because the IC Tool is waiting for communication at the new baud rate At this point the HyperTerminal should be disconnected menu Call Disconnect then the baud rate changed in the properties window menu File Properties then the Configure button In this example the Bits per second should be changed to 460800 then the OK button pressed on both windows HyperTerminal should then be reconnected menu Call Call and the AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMO001 24 August 2004 enter key pressed This will set the C Tool into the message display mode at the new baud rate and if it is connected to an active I C bus the messages sho
12. ayed correctly at 115200 baud This baud rate will only be temporary and if it is to be kept the settings should be saved using the command S at the command prompt 9 Increasing PC Serial Port Speed The drivers for the serial ports that are supplied with Windows are generally only capable of speeds up to 115200 baud although the hardware in most PCs is capable of running faster There are alternative drivers available from the following locations For all versions of Windows and Linux www devdrv com shsmod index htm For Windows 2000 and XP only www rippstein net HiSerialEN htm Alternatively the IC Tool can be connected through a USB to serial port adapter Some of these will support baud rates up to 921600 but you need to check the specifications carefully We recommend the product code ZP43 from www maplin co uk which will support 460800 baud USB serial ports will generally be assigned to the next available COM port It is possible that this will place it out of range of the ports that can be selected from certain versions of Hyperterminal To change the allocated port in Windows 98 Run the Windows Device Manager Control Panel System Device Manager tab The USB to Serial Port device should be selected on this list and the properties button pressed On the Resources tab the Use automatic settings box should be cleared and the Input Output Range for the device should be changed to the following settings to assign it
13. clude messages from addresses 0x38 and OxD8 and 0x39 and OxD9 the command f 38 D8 should be used The filters can only be applied on up to two addresses at a time The I C Tool provides read write filtering options as described in section 5 1 below The windows application supplied with the PC Bus Monitor can provide more filtering options 4 6 Repeated Start New Line Some protocols that use the C bus or the SMBus require that stop conditions are not used between messages This results in the message display showing all messages running together without new lines in between It means that timestamps cannot show the time of each of the messages For this situation the command r should be used to switch on the new line for repeated starts This will cause each message to be shown on a new line whether or not the previous one was terminated by stop condition AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMOOI 24 August 2004 s38w031E 39r03A362 s38w031E 39r039CF7 s38w0317 39r16B158 s38w031E 39r0343D9 s30w81 s31r05170002 3049 s38w031E 39r039058 s38w0317 39r154D47 4 7 Show Settings Entering the command s lower case causes the current settings to be shown 2S Baud 115200 Colour On Filter 38 TimeStamp On TimeDots On RepeatedStartNewline On CR LF Off gt 4 8 S
14. command rxAA LL Where AA is the address to read from must be odd and LL is the number of bytes to read Both are entered as two digit hex values The command rxA1 04 will set up the receive operation to read 4 bytes of data from the slave device at address Ox AT The receive is performed from the message display mode by pressing the r key This will produce a display such as SA1rFFFFFF For some slave devices the length of data to be read is not known by the master In these cases it is common for the slave device to indicate the length of data by the value of one of the first bytes it sends The PC Tool can retrieve the length from the message by the command rxAA gt PP l LL where AA is the address to read from must be odd PP is the position within the received message to extract the length from and LL is an offset to that byte so that it gives the total number of bytes to receive All these are entered as two digit hex values Examples are rx31 gt 00 00 Receive from address 0x31 a message whose length is given by the first byte received e g 531104010203 where 04 is the total number of bytes in the message rx31 gt 01 02 Receive from address 0x31 a message whose length is given by the value of the second byte plus 2 e g 53110A051122 334455 where the number of bytes received is given by the byte value 05 plus 2 to give a total of 7 bytes rx91 gt 03 F0 The length is given by the 4 byte received minus OxFO e g S91r0B240
15. ed The maximum time it will be held is Sus This has the requirement that for the tool to correctly monitor bus traffic all IC Master devices must support clock stretching as required by the TC specification when operating over 400kHz or over 100kHz when the tool is emulating slave devices 7 Windows Application Capabilities Certain restrictions to the operation of the tool exist when using the terminal interface The transmit messages are limited to 32 bytes and it is not possible to set certain modes for the trigger connection Windows applications using the supplied OCX can transmit messages of up to 64k bytes in length and can operate as a slave device where the data requested by the master is calculated just prior to being sent e g emulating a memory device where the address to be read is sent just before the read To achieve these features the OCX exchanges data with the C Tool during message transmission The C Tool holds the bus at appropriate times for the data to be transferred between the PC and the tool for it then to be sent on the I C bus Due to the reaction time of the PC this can result in the bus being held for periods of around 4ms This is well inside the SMBus limit of 35ms and so communications involving these types of message are possible on SMBus systems The OCX allows the trigger output to be activated whenever the IC Tool transmits as an C Master or whenever it participates in bus transfers as an IC Slave device
16. filtering described in section 4 5 above the I C Bus Tool can filter out messages depending on whether they are read or write using a r or w suffix to the address Example commands are f 30w Only display writes to address 0x30 f 30w 38w Only display writes to addresses 0x30 and 0x38 f 30r 38 Display everything except reads from address 0x30 shown as 0x31 and any accesses to address 0x38 f 30r 38r Display everything except reads from address 0x30 shown as 0x31 and 0x38 shown as 0x39 5 2 Acknowledge Bit Detection The C Bus Tool can detect and display the condition of the Acknowledge bit that occurs at the end of each byte on the bus There are two levels of display The aa command causes the Tool to show the condition for each byte as either acknowledged Ack shown as a or not acknowledged NAck shown as n The stop condition at the end of each message is shown 6699 with a p character Note that all read messages odd addresses should finish with a NAck AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMO01 zah August 2004 881 s38wa03al7a 39ra3Fa55a04np 884 s38wa03alEa 39ra0Da79aB8np 886 sD8wa67al0ap 887 sD9ral0a90aD0al0np 908 s38wa03alEa 39ra0EaD7a3Dnp 910 s38wa03al7a 39ra4laD6a56np 913 s38wa03alEa 39ra0DaA0alEnp 929 s30wa8lap 931 s31ra05a17a00a02a30a49np 939
17. is Manual This User manual covers both the PC Bus Monitor and the C Bus Tool The PC Bus Tool has all of the features of the PC Bus Monitor with additional functionality described in section 5 3 Getting Started Windows On a Windows system run the HyperTerminal application This can usually be found from the start menu under Accessories Communications HyperTerminal This will bring up the contents of the HyperTerminal directory from which the application can be run It is also available for download from www hilgraeve com htpe download html Start the HyperTerminal program from the icon Hypertrm exe Enter a name for the connection and select an icon In the following dialog select the Com port that you wish to connect the Bus Tool to In the next window select the speed as 115200 bits per second baud 8 data bits No parity 1 stop bit and no flow control as shown AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMOOI 24 August 2004 COM1 Properties Select OK then select the menu item File Properties and select the settings tab as indicated Select the ASCII Setup button and switch on the option to append line feeds to incoming line ends New Properties ASCII Setup pees eae The connection settings can now be saved from the item in the File menu Plug the C Bus Tool into the com port and the text should appear as sh
18. led on and off with the command d With time dots enabled periods of inactivity of the IC bus are indicated with a character for every elapsed second without a message being received 4 4 Timestamps The timestamps can be toggled on and off with the command t When timestamps are on a time is shown at the start of each line The display shows the seconds and milliseconds of the time of arrival of the message The seconds will count up to 99 and wrap round to zero s30w81 831705170030 sD8w6710 sD9r1090D010 s30w81 s31r05170030 5097 s30w81 s317r05170030 5097 s31r0D450003 00000000 00000510 005D sD8w6710 sD9r1090D010 s30w81 s31r05170030 s30w81 831r05170030 sD8w6710 sD9r1090D010 4 5 Filters The messages can be filtered to remove one or two addresses from the display or to show only messages from one or two addresses The filter addresses apply to both read and write transfers i e if 0x30 is entered it will apply to both 0x30 and 0x31 If odd addresses are entered they will be converted to the corresponding even address If you wish to see only messages for address 0x30 and 0x31 the command f 30 should be used If you wished to see messages for addresses 0x30 and 0x70 and 0x31 and 0x71 you should use the command f 30 70 The order is only significant if colours are used see section above If you wish to exclude messages for address 0x38 and 0x39 the command f 38 should be used If you wish to ex
19. ltered out of the display will not consume bandwidth and will not be stored in the C Tool buffer therefore increasing the bandwidth for the other messages e Colour can be switched off For each colour change in HyperTerminal five characters have to be stored in the C Tool and sent through the serial port When timestamps are on they are displayed in black so each message requires two colour changes 10 characters Switching colour off can therefore increase the message throughput significantly e Timestamps could be switched off if not required These take 7 characters each so switching them off can improve message throughput Increase Serial Port speed This is the most convenient solution but the serial port drivers supplied with Windows usually support 115200 as the highest speed See section 9 below for details of how to increase this limit 8 1 Resetting Baud Rate If the PC Monitor is used on a PC with a high baud rate and then moved to another that cannot achieve that baud rate communications will not initially be possible To get the tool working at the default baud rate of 115200 disconnect the blue and white probes yellow and green for the Tool from the system under test and connect them to each other Unplug the IC Monitor from the PC and plug it back in with HyperTerminal running at 115200 baud Initially you will see some corrupt characters as the banner is displayed at the higher baud rate Then you should see the banner displ
20. own below AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMO001 24 August 2004 Com1 57k6 HyperT erminal iof x File Edit View Call Transfer Help Ole ex sore es AvitResearch I2C Bus Honitor v1 1 Oct 23 2003 s n 0002 z Connected 0 01 40 Auto detect 1152008 N 1 SCROLL CAPS INL Ui The probes can now be connected to the target system The black probe should be connected to ground the white or yellow to the IC data and the blue or green to the PC clock Important The ground wire should always be connected first and removed last This is to avoid excessive voltages on the data and clock pins that could cause permanent damage to the PC device With the cables connected and with the target system powered the messages should be seen scrolling on the screen Press the space bar to halt the messages and return to set them going again AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMO001 24 August 2004 Com1 57k6 HyperT erminal Iof x File Edit View Call Transfer Help s38u031E 39r000000 s31r0D450006 00000000 00000316 0064 s O0us0C88000 SOEOSOFS SOFO4069 07300079 04800070 96000000 00000000 OOOOOOO 0000 000 00000000 04006001 CO3OSODC 930000 s384031E 39r 000000 38u0317 39r14641D s384031E 39r 000000 s38
21. r000000 838w0317 39r137489 s30w81 s38w031E 39r000000 s31r05170041 52AA s38w031E 39r000000 s38w0317 39rl14DB7F s38w031E 39r000000 s38w031E 39r000000 s38w0317 39r13CD47 s38w031E 39r000000 s31r0D450006 00000000 00000315 0063 s70w80C88000 80E080F8 80F04069 05300079 04800070 96000000 00000000 00000000 00000000 00000000 04006001 C030900C 930000 s38w031E 39r000000 s38w0317 39r123DF7 The colours are chosen in order of arrival of messages on returning to the message display The first address will be assigned red the second blue the third yellow appearing on HyperTerminal as a fawn colour and all following ones cyan The assigned colours are saved with the other settings see section below so that the appearance can be consistent across sessions The assigned colours can be cleared by entering the command cc at the prompt When returning to the message display the colours will be re assigned in order of messages received When filters are used to show only messages from a certain addresses see section below the colours are allocated differently In this case the first message in the filter list is assigned blue for write messages and red for read The second is assigned cyan for write and yellow for read AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMOOI 24 August 2004 4 3 Time Dots The time dots can be togg
22. s all on the top line of the display then the option for CR LF needs to be turned on in the PC Monitor To do this enter a space character which should AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMOOI 24 August 2004 cause the prompt character gt to appear at the left of the screen Then enter an n character and a newline This should cause the display to show nn 0012 23 2003 CR LF On gt Then enter an S must be upper case followed by newline to save the settings When connecting the next time the display should be the same as that seen with HyperTerminal Version 0 61 of ptelnet has an option to log the data to a MemoPad entry This operates much like the text capture in HyperTerminal AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMO001 24 August 2004
23. ugh the menu Transfer Capture Text 9 Stop It can then be viewed using a text editor such as Notepad or WordPad 4 Monitor Commands 4 1 Command mode The display normally shows the PC messages scrolling up the screen as they arrive To change settings the device must be put into the command mode This is done by pressing the space bar or virtually any other key This will cause the messages to halt and display the command prompt gt Whilst the prompt is shown any I C messages received will be discarded From here settings can be viewed and changed Entering a and pressing enter will show the available commands AVIT Research Limited e Compass House Vision Park Cambridge e CB4 9AD Tel 44 0 1223 257758 info avitresearch co uk Document ICBT UMOO0I 24 August 2004 2 Commands c Colour On Off cc Clear Colours d TimeDots On Off t Timestamps On Off f XX YY Filter f0 Filter Off r Newline for repeated start n CR LF On Off s Show settings S Save settings bX Set to X kbaud eg b115 115200 baud v Version Info gt These commands are described in the sections below To return to the message display press the enter key 4 2 Colour Entering the character c then pressing enter will toggle the colour setting between on and off With the colour on messages will be coloured according to their address s38w031E 39r000000 sD8w6710 sD9r1090D010 s38w031E 39
24. uld be seen At this point the baud rate is only set temporarily so that 1f it is physically disconnected then plugged back in it will revert to the previous baud rate To keep the new baud rate the command prompt should be called up with the space bar and the command S used to save the settings If you discover that HyperTerminal will not connect at the new baud rate it can be set back to the original rate and the C Tool removed from the connector and plugged back in this may need to be done twice before it will communicate at the original baud rate More discussion of baud rates and bus speeds are in section 8 below 4 10 Version Info The v command displays the version information that is seen at start up 4 11 CR LF Some terminal emulators do not provide the facility to add a line feed LF character to the carriage return CR characters they receive The PC Tool normally only transmits the CR character at the end of each line to reduce the amount of data that needs to be sent over the serial link Therefore if the terminal program does not add the LF character itself all the text can appear on a single line To get over this problem the C Tool can be set to send both a CR and LF character at the end of each line This is switched on and off with the n command The setting will be saved by the Save Settings command described in section above 5 C Bus Tool Commands 5 1 Additional Filtering In addition to the
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