User Manual
Contents
1. conversion process ID will not be changed ram m m Frame ID 3 00 00 CRC field Data field Data 7 ms Figure 4 10 the conversion format of communication frame Modbus mode Nevertheless CRC checking byte will not be converted to CAN message and CAN message should not be with checking byte of series frame because CAN bus itself has better checking mechanism The protocol content function code and data in Modbus RTU is converted When converting the protocol content is converted in turn to CAN message frame started with the second data byte the first one is used for segmental protocol and the length of Modbus RTU frame is different according to the different function code Only seven pieces of data are transmitted in one CAN message frame so that the longer Modbus RTU frame will be segregated converted to CAN message and then transmitted with above CAN segment protocol User can receive function code and data in CAN nodes For Modbus CAN bus protocol data it does not need cyclic redundancy check CRC16 After converter receives a frame according to segmental protocol the cyclic redundancy check CRC16 will be automatically added and it will be converted to Modbus RTU frame and sent to series bus If the received data does not comply with segmental protocol the data will be abandoned 4 3 3 Conversion example In the condition of setting extended frame which is shown in Figure 4 11 when converting2. Intelligent protocol converter CANRX CANTX 232RX 232TX PWR Ce ee oe ee CAN BUS 2 2 Interface description UT 2505 converter 2 2 1 CAN interface definition Pin No Name Description 1 CANH Connection terminal of CANH signal 2 CANL Connection terminal of CANL signal 3 RES Terminal 1 of CAN matching resistor 4 RES Terminal 2 of CAN matching resistor 5 RESET Reset 6 GND Ground 7 GND Ground 8 SET Set signal 9 VIN Power supply input 10 GND Power supply input Figure 2 2 The definition of CAN interface is shown in Figure 2 2 pint marked with CANH and pin2 marked with CANL are CAN signal connectors pin3 marked with Res and pin4 marked with Res are connected with CAN network terminal resistance When UT 2505 converter is used as CAN bus network terminal the resistance of 1200 should be connected between two pins if the resistance of 1200 is not connected pin5 marked with RESET and pin6 marked GND are conversion reset signals pin8 marked with SET is the configuration pin of the converter If the pin is floating when it is powered the converter will enter the normal conversion mode if the pin is connected with pin7 marked with GND the converter enters configuration mode when powered Pin9 marked with Vin is connected to external 9V 30V DC power supply and pin10 marked with GND is connected to external
3. Modbus RTU frame to CAN message the address 0x08 is directly filled to frame ID4 and the other frame ID are filled with 0x00 During converting process the frame ID will not be changed If a frame Modbus message cannot be processed in a frame CAM message the segmental protocol is applied for CAN message The data1 in each CAN message are all used to fill the segmental information 0x81 0xC2 and the information will not be converted Modbus RTU frame which is used to confirm frame information as frame format The value of function code and data are filled to data 2 8 in CAN message in order Serial frame CAN message CAN message 1 CAN message 2 00 gt Data3 00 01 o em es BE ee Ow a Figure 4 11 the example of conversion format of communication frame Modbus mode 4 4 Application note O It is suggested to be used in low speed systems and converter is not available for high speed data transmission O After switching between configuration mode and normal operation mode the converter should be re powered or the original operation mode will be implemented and the successful switch cannot be achieved O In transparent conversion with mark and Modbus conversion the frame types of CAN network and configuration should be same or the communication cannot be implemented O In transparent conversion with mark and Modbus conversion the transmission of series frame should
4. on the characteristic resistance of the transmission cable for example if the characteristic resistance of twisted cable is 120Q a terminal resistance of 1200 should be integrated to two bus terminals The UT 2505 converter internal circuit is not integrated with the terminal resistor of 1200 the terminal resistor is included to the package When UT 2505 converter is used as a terminal device the user can connect terminal resistor of 1200 in UT 2505 converter CAN interface between pin3 Res and pin4 Res For UT 2505 there are two installation methods DIN rail installation and self stacked installation The twisted cable or shield twisted cable can be used as CAN communication line If the communication distance exceeds 1KM the wire sectional area should be ensured of at least 1 0mm The detail specification should depend on distance and it should be regularly enlarged with the increasing distance 3 Configuration instruction Since there are so many communication parameters in CAN bus and RS 232 series port UT 2505 allows users to make settings by themselves according to actual application requirements UT 2505 converter configuration includes the converter conversion mode series port parameters CAN bus parameters etc The parameter configuration can be implemented with configuration software Before normal operation the conversion parameters of UT 2505 should be configured in advance if it is not configured the p
5. power supply ground 2 2 2 RS 232 interface pin definition For UT 2505 RS 232 port is standard DB9 socket and the pin definition complies with RS 232 specification Here a 3 wire connection is used DB9 Female RS 232C pin PIN RS 232 interface signals en 1 Protective earth Z 4 2 Serial data output SOUT TXD O N 3 Serial data input SIN RXD 5 Signal ground GND 4 6 7 8 9 Vacant 2 3 Indicator description Indicator Colour Function Description PWR Red Operation power When the indicator is on the converter supply power supply runs normally 232TX Green Sending via The indicator flashing means the series series port port is sending data 232RX Yellow Receiving via The indicator flashing means the series series port port is receiving data CANTX Green CAN sending The indicator flashing means the CAN is sending data CANRX Yellow CAN receiving The indicator flashing means the CAN is receiving data The LEDs on converter are all used for indicating the operating state of UN 2505 converter 2 4 CAN bus connection UT 2505 UT 2505 CANdevice CAN device 1200 1200 According to ISO 11898 specifications in order to enhance the reliability of CAN bus communication two terminals of CAN bus network should be equipped with terminal matched resistance 1200 shown in the above figure The size of the terminal matched resistance depends
6. series frame data and frame message If the frame information conversion is allowed every 4 bytes 8 bytes in total If it is not selected the CAN frame ID will not be converted The position of the CAN frame ID in the series frame is as follows The parameter is available only in transparent conversion with mark mode When series data is converted to a CAN message the deviation address of starting byte of CAN message frame ID and length of frame ID Refer to 4 2 Transparent conversions with mark are converted 3 2 2 Serial parameter Baud rate the serial baud rate is selectable between 1200bps 115200bps with one start up bit and eight bits without parity 3 2 3 CAN parameter UT 2505 configuration software ER COM Port Configuration 232 baud rate 9600 CAN baud rate Conversion mode Transparent transmission CAN frame type Standard frame Location of CAN identifier in the serial frame Original offset 0 00 00 00 Ol Timm Identifier length 1 CAN filter mask 00 00 00 00 Hex CAN receive filter code 00 00 00 02 HEX Allow CAN frame ID to be sent to serial data User defined mask i Allow CAN frame content to be sent to serial data Set return value f Connection Configuration Readout Figure 3 2 CAN parameter interface Baud rate CAN bus baud rate is selectable between 5Kbps 1 Mbps Frame type when conversion there are two CAN message fram
7. with series debug software to observe whether the data received by CAN device is same as the sent data Similarly sending data from CAN device to converter can also be observed whether the data received by series software is same as the sent data If the data is transmitted the indicator in corresponding side will flash Bit 3 Reset RM symbol function number value set If the BP bit see the next row is 0 then the value of this field is the row number of the lookup table starting from 0 and the acceptance filter use this value to match the receiving identifier The disable row in standard table also has a number but it is not used to match Please refer to the ID index example in section 12 16 example of acceptance filter table and ID index value for details 9 0 ID index If this bit is 1 then current message will be received in 10 BP AF BYPASS mode and the ID index field see the 0 x previous row has no effect Reserved User software should not write 1 to these 15 11 reserved bits and the readout value from these bits is NA not defined This field includes the data length code DLC of currently received message If RTR 0 then the value of this field is relevant to the available data byte counts of the CANRDA and 19 16 DLC CANRDB registers 0 x 0000 0111 0 7 bytes 1000 1111 8 bytes If RTR 1 then the value of this field specifies the data byte counts which are requested to be sent back and the s
8. with the Modbus communication protocol 4 3 1 Frame format 4 3 1 1 Series bus frame The standard Modbus RTU protocol is applied for series interface so the user frame should comply with this protocol refer to appendix Modbus protocol introduction If the converted frame does not comply with Modbus RTU format the received frame will be abandoned and will not be converted Modbus RTU transmission format used for converter is one starting bit eight data bits and one stop bit The maximum Modbus RTU frame length is the length of buffer 255 bytes 4 3 1 2 CAN bus frame The devices applying Modbus protocol in CAN side requires a reliable transmission formation which is realized with a segmental protocol It defines a method to segregate and recombine the message more than 8 bytes The transmission protocol in DeviceNet segmental message is referenced for establishing segmental transmission protocol The segmental message format is shown in table 4 1 Taking extended frame as example and standard has the same format except the length of frame ID and the transmitted Modbus protocol content is started with data2 byte If the protocol content is more than 7 bytes the remainder protocol content will be continuously converted based on this segment formation until the conversion is accomplished CAN bus frame format is described as following Frame content Frame ID1 Frame ID2 Frame ID3 Frame ID4 Seg
9. 1 Series bus frame It can be data stream or data with protocol Communication format 1 start bit eight data bits and 1 stop bit 4 1 1 2 CAN bus frame CAN message frame format is same 4 1 2 Conversion method 4 1 2 1 Series frame converting to CAN message All data in series frame is filled in CAN message frame in order As soon as the converter receives the last frame data in series bus it starts converting The converted CAN message frame data frame type section and frame ID is pre set by user During conversion the frame type and frame ID will not change The data conversion corresponding format is shown in Figure 4 1 If the length of received frame is less than 8 bytes the characters from 1 to n n is the length of series frame is filled to the CAN message data with position from 1 ton If the length of series frame is not less than 8 started with the first character in series frame eight characters are filled to CAN message in order After data is transmitted to CAN bus the remainder series frame data will be converted and filled to CAN message until the data conversion is accomplished Serial frame CAN message standard frame Frame User configuration content ae Figure 4 1 Converting series frame to CAM message transparent mode 4 1 2 2 CAN message converting to series frame For the CAN bus message as soon as one frame is received it is re transmitted The data conversion corresponding format is shown in Figure 4
10. 2 When converting the data in CAN messages are all converted to series frame in order If Enable frame message conversion item is selected when setting the frame message bytes in CAN message will be all filled to series frame in converter directly If Enable frame ID conversion item is selected the frame ID byte in CAM message will be all filled to series frame Serial frame CAN message standard frame Frame Frame content content ne Frame ID2 Data 6 Figure 4 2 Converting CAM message to series frame transparent mode 4 1 3 Conversion example 4 1 3 1 Series frame converting to CAN message Assuming CAN message frame message is set to standard frame frame ID1 ID2 is respectively OO 60 and conversion format is shown in Figure 4 3 Serial frame CAN message standard frame 05 01 Figure 4 4 Example of converting CAM message to series frame transparent mode 4 1 3 2 Series frame converting to CAN message If CAN message is set with frame information conversion frame ID will not be converted CAN message and converted series frame are shown in Serial frame CAN message standard frame 07 Data field Figure 4 4 Example of converting CAM message to series frame transparent mode 4 2 Transparent conversion with mark Transparent conversion with mark is a special transparent conversion method which is easy for users to setup their own network and use custom app
11. N frame CAN frame CAN frame ID1 ID1 ID1 Data field Data 4 CAN frame ID1 Address Data n n 1 Figure 4 6 series frame converting to CAN message transparent conversion with mark 4 2 2 2 CAN message converting to series frame For CAN message as soon as a frame is received it is re transmitted When re transmitting the ID in CAN message is converted according to the position and length in pre set CAN frame ID The other data are re transmitted in order which is shown in Figure 4 7 Note when applying the frame format of both series frame and CAN message standard frame or extended frame should comply with the pre set frame format requirement or it will cause communication failure CAN message standard frame Frame Frame content content Bin Frame ID2 Figure 4 7 CAN message converting to series frame transparent conversion with mark 4 2 3Conversion method 4 2 3 1Series frame converting to CAN message Assuming that the starting address of CAN ID in series frame is 2 and length is 2 in the condition of extended frame the series frame and converted CAN message result is shown in Figure 4 8 Where the same ID is used for conversion by two frames of CAN message Address2 Data 3 CAN frame ID1 Address3 Data 4 CAN frame ID2 Address8 Ps CAN message 1 CAN message 2 Frame ID 1 Data 3 Data 3 CAN frame CAN frame ID1 ID1 Frame ID 2 Data 4 Data 4 CAN frame CAN frame ID2 ID2 franc
12. UT 2505 Converter manual 1 1 UT 2505 intelligent protocol converter can quickly connect RS 232 485 communication device to CAN bus field bus The converter supports RS 232 RS 485 with the communication speed range of 1200 115200bps and CAN bus communication speed range of 5Kbps 1Mbps The converter supports three data conversion modes transparent conversion transparent conversion with flag and Modbus protocol conversion it also supports Modbus RTU protocol UT 2505 converter is equipped with configuration software and user can flexibly set UT 2505 converter operation parameters Applications 0 Mine remote communication 0O Intelligent buildings public broadcasting system Security and fire network Industrial communication network O Railway device network Features Duplex data communication between CAN bus and RS 232 RS 485 Supporting CAN2 0A and CAN2 0B protocol complying with ISO DIS 11898 specification O Integrated one way CAN bus communication interface supporting user defined communication baud rate Integrated one way 3 wire RS 232 communication interface and communication rate could be set within the range of 1200 115200bps Supports three data conversion modes transparent conversion transparent conversion with mark and Modbus protocol conversion O Operating temperature 40 C 85 C 2 1 Appearance OTEK Model UT 2505 RS 232 CAN BUS
13. ame coding is used Reserved User software should not write 1 to these 29 20 reserved bits and the readout value from these bits is NA not defined This bit includes the remote transmitting request bit of currently received message 0 means a data frame is received and if DLC is a non zero value then the data 30 RTR can be read out from CANRDA or CANRDB register 1 0 x means a remote frame is received and the DLC value is used for identifying the byte counts to be requested to transmit using the same identifier If this bit is O then the currently received message includes an 11 bits identifier If this bit is 1 then the 31 FF currently received message includes a 29 bits 0 x identifier The value of this bit can influence the content of CANID register which will be described below Bit Reset RM symbol function number value set 11 bits of identifier field of currently received message 10 0 ID These bits are represented by ID10 0 in CAN2 0A or 0 x ID29 18 in CAN2 0B Reserved User software should not write 1 to these 31 11 reserved bits and the readout value from these bits is not NA defined Table 12 16 RX identifier register when FF 1 Bit 5 Reset RM symbol function number value set 28 0 ID 11 bits of identifier field of currently received message 0 N These bits are represented by ID29 0 in CAN2 0B Reserved User software should not write 1
14. arameters which are successfully configured will be implemented in UT 2505 converter if it has never been configured the default parameters will be implemented in the converter 3 1 Configuration In order to enter the configuration mode a special configuration switch pin8 marked with SET and pin7 marked with GND in CAN interface side is used After SET is grounded and the converter is powered it will enter configuration mode when SET pin hanging and the converter is powered it will enter normal operation mode The steps of entering configuration are listed below 1 Connecting the SET and GND of the converter with cable and power on 2 Connecting UT 2505 converter and PC with series port line which is included to the package 3 Running configuration software on PC side selecting corresponding device opening series port and setting parameters m UT 2505 configuration software pa BES Speed 9600 Baud 3 2 Software description UT 2505 configuration software COM Port Configuration 9600 v k Transparent transmission Standard frame 00 00 00 02 00 00 00 01 00 00 00 00 Configuration Readout Figure 3 1 Configuration interface The configuration software interface of UT 2505 converter is shown in Figure 3 1 The configuration software can save and display UT 2505 converter parameters which are successfully set at last time It also can read out the c
15. e types standard frame and optional extended frame Sending frame ID available only in transparent conversion mode which means that the series data is converted to CAN message frame ID value hex data note that it is not available in transparent conversion with mark mode so the sent frame ID is filled with the data in above series frame Refer to the section 3 2 1 The position of CAN ID in series frame Note the frame ID is the actual CAN message ID value the order from left to right is form higher byte to lower byte for example if the value is OO 00 00 0A HEX the sending frame ID is 10 the data should not be shifted as it did in the previous version The bytes from left to right are named as IDO ID1 ID2 and ID3 The bit sequence is from high to low and the capital letters spacing and character number should be same with that it is opened or there will be an error This item is also related to the frame type If the standard frame is selected the frame ID is 11bit available and the value range is O 7FF HEX The exceeded part is invalid and only lower 11bit is taken as effective If the extended frame is selected the frame ID is 29bit available and the value range is 0 1F FF FF HEX The exceeded part is invalid and only lower 29bit is taken as effective Self defined mask code if this option is selected users can define CAN controller filter by themselves to provide multiple filter met
16. er recognizes that the frame transmission is accomplished and the character is taken as the last character the characters after the time transmitting n characters is not belonging to this frame but the next frame The frame format is shown in Figure 4 5 tO Frame 1 Frame 2 I s He T Less than n characters More than n characters Figure 4 5 the time format of series frame Transparent conversion with mark 4 2 1 2 CAN bus frame The format of CAN message holds and only frame ID corresponding to CAN will be converted to series frame 4 2 2 Conversion method 4 2 2 1 Series frame converting to CAN message The starting address and length in series frame with CAN mark could be set in configuration The range of starting address is 0 7 and the range of length is 1 2 When converting the CAN frame ID in series frame are all converted to CAN message frame ID according to the setting if the number of frame ID is less than the number of CAN message frame ID the filling order of CAN message is frame ID1 ID4 and the remainder ID are filled with 0 the other data are converted in order shown in Figure 4 6 If a frame CAN message converting to series frame data is not accomplished the same ID will be taken as CAN message frame ID to continue converting until the series frame conversion is accomplished Serial frame CAN message 1 CAN CAN message EN Frame User User User Configuration Configuration Oo Frame ID 2 Data 4 Data 4 Data 4 CA
17. es m m Famm m m Data 14 om a Address13 Data 14 Figure 4 8 Example of converting series frame to CAM message transparent conversion with mark mode 4 2 3 2 CAN message converting to series frame Assuming that the starting address of set CAN ID in series frame is 2 and length is 2 in the condition of extended frame the CAN message and converted series frame result is shown in Figure 4 8 CAN message standard frame Serial frame 30 Frame ID2 Figure 4 9 Example of converting CAM message to series frame transparent conversion with mark mode 4 3 Modbus conversion Modbus protocol is a standard application level protocol which is widely used in all kinds of industry control application The protocol is open and real time with good communication authentication mechanism which is very suitable for applications with requirement of high communication reliability The standard Modbus RTU protocol format is applied in converter s series port side so that the converter can not only support user to use Modbus RTU protocol but also directly interface with other device which supports Modbus RTU protocol In CAN side an easy segment communication format is established to realize Modbus communication The converter plays a role of checking protocol and re transmitting and it is not the master or slave station of the Modbus but supports the transmission of Modbus protocol User just needs to comply
18. hods refer to appendix A 3 CAN message filter setting if it is not selected the filter is set by configuration software with single filter method and the mask code of filter is set as filter checking code value which is set for reception only Note Suggestion 1 If all CAN nodes messages are to be received this option should be selected and the filter mask code value is FF FF FF FF 2 If only fixed ID messages are to be received this option should not be selected only fill actual checking code to filter checking code If only CAN message with frame ID 6 is to be received unselect this option and set filter checking code value with OO 00 00 06 Filter checking code ACR if filter mask code is set with interrelated only when received frame ID and filter checking code are same this frame data will be received in receiving buffer area or it will be rejected The filling data format is hex and every 8bit byte is separated with Space The bytes from left to right are respectively named as ACRO ACR1 ACR2 and ACR3 and bit order is from higher to lower 3 2 4 Examples for setting checking filter 3 2 4 1 Non custom mask code The non custom mask code is shown in Figure 3 3 and Figure 3 4 The setting of unselecting custom mask code Due to non custom mask code user only needs to fill filter checking code and filter mask code is automatically set b
19. lication protocol via converter In this mode the address information in series frame will be automatically converted to CAN bus frame ID If the starting position and length of the address in series frame is set in advance the converter will extract the frame ID and fill itin CAN message frame ID as the CAN message ID when re transmitting the series frame When converting CAN message to series frame CAN message ID is also converted to the corresponding position in series frame Note in this conversion mode the Sending ID in configuration software CAN parameter item is invalid so the sending frame ID should be filled with the data in above series frame 4 2 1 Frame format 4 2 1 1 Series bus frame When converting with mark it requires the whole series data frame and the interval between frames will be recognized as partitioning standard And the interval can be set by user The maximum series frame length is the length of buffer 255 bytes The first data detected by converter in series bus idle state is taken as the first character in receiving frame In transmission the interval in the frame should be less or equal to the time of transmitting n characters n value could be set in PC in advance the time of transmitting a character the bit number included in the character corresponding baud rate After receiving a character if there is no more received characters within the time of transmitting n characters the convert
20. meet the configured time requirement or there will be communication error O Since CAN bus is half duplex the data sequence in bus both sides should be ensured in data conversion process If sending a lot of data to converter in bus both sides it will cause incomplete data conversion O When using UT 2505 converter the baud rate and the interval of sending data in bus both sides should be reasonable When converting the data acceptability of bus with low bait rate should be considered For example when converting CAN bus data to series bus the rate of CAN bus reaches thousands frames per second and the rate of series bus is just hundreds frames per second So if the rate of CAN bus is too fast the converted data will be incomplete Generally CAN baud rate should be about 3 times the serial port baud rate and data transmission will be relative uniform because the other functions are added when CAN bus transmits data which enlarges the length of data so that under the same baud rate the time of CAN transmission is longer than that of series bus transmission When converting series bus data to CAN bus if data less than 255 bits is sent the next data should be sent after previous data are all sent to CAN bus to avoid data lost 4 5 Converter test 4 5 1 Power supply test The converter is connected to an external 9V 30V 1W DC power supply After powered POWER indicator will be lighted immediately If the state of all indica
21. ment Data 1 tag Segment type Segment counter Data 2 Character 1 Data 3 Character 2 Data 4 Character 3 Data 5 Character 4 Data 6 Character 5 Data 7 Character 6 Data 8 Character 7 Table 4 1 CAN 2 0 B extended frame format O Segmental message flag it indicates whether the message is segmental message If flag 0 it is single message if flag 1 it is one frame of the segmental message O Segment type indicates the first section middle section or the final section The value definitions are listed in Table 4 2 Bit value meaning explanation If segment counter includes value 0 0 1 segment f f then this segment is the first segment Intermediate segment This is the intermediate segment 2 Last segment This is the last segment Table 4 2 Value definition for segment type O Segment counter the flag of each segment is the series number of the segment in the whole message The counter value indicates the number of the segment It can help to verify whether there is segment lost when receiving data 4 3 2Conversion method When converting series side to CAN side only after converter receives an intact and correct Modbus RTU frame the conversion will be implemented or it will not be implemented Shown in Figure 4 10 the address of Modbus RTU protocol is converted to ID4 extended frame ID2 standard frame of the frame ID in CAN message and during the frame
22. r both terminals of the bus Transparent conversion with mark is a special transparent conversion method without adding a protocol This conversion method is according to the common characteristic of usual series frame and CAN message so that these two different bus types can be easily set up to a Same communication network This method can convert the address in series frame to CAN message ID where the starting position and length of address in series frame can be set So this way the converter can be largely adapted to user s custom protocol Modbus protocol conversion is established to support standard Modbus protocol and the standard Modbus RTU protocol is applied in series port side which could interface with other standard Modbus RTU device A simple segmental protocol is applied in CAN bus side to transmit Modbus protocol It can help to realize Modbus protocol communication between series network and CAN network These three format conversion methods are introduced in detail as following and explaining communication process with the example 4 1 Transparent conversion In transparent conversion mode as soon as the converter receives the data in one bus side it will be re transmitted to another bus side In this way it maximizes the converter speed and the buffer usage A converter receives and re transmits data at the same time which helps to empty the receiving data buffer 4 1 1 Frame format 4 1 1
23. to these 31 29 reserved bits and the readout value from these bits is NA not defined
24. tors does not comply with the description after powered please check whether the power supply complies with the requirements 4 5 2 Configuration test After configuration switch is connected connecting pin8 SET and pin7 GND in CAN interface side and then powered the converter enters configuration mode Connecting PC and converter with series line enables configuration Running configuration software selecting PC series port connected with converter and clicking open series port button If it is opened the following configuration parameters are opened which could be changed and set If the converter runs in normal operation mode the software will remind the device cannot be connected and please check whether the selected PC series port is connected 4 5 3 Communication test After disconnecting configuration switch disconnecting pin8 SET and pin7 GND in CAN interface side and then re powered the converter enters normal operation mode The communication test could be implemented with series debug software 232 UT 2505 CAN CANBUS CANH C ANL CANL ttittiitihi Device The communication test structure connection is shown in Figure 4 12 Except for the PC there should be a CAN device for receiving and sending data Note that the baud rates of CAN device and UT 2505 converter should be same in one CAN bus The series baud rate same as converter should be selected
25. urrent parameters of UT 2505 converter Only after converter enters configuration mode the parameters can be set via software or the software recognizes when the converter is not connected Click connect if it shows the device is connected it is connected and it could be configured if it shows the device is not connected please check whether it is occupied connected or the configuration pin is grounded and is powered The main configuration parameter definitions are described in detail as follows 3 2 1 Conversion parameters Conversion parameters refer to the conversion rule direction of the conversion etc The conversion parameters interface is shown in Figure 3 1 Conversion modes there are three optional conversion modes transparent conversion transparent conversion with mark and Modbus protocol conversion for more details on each mode please refer to 4 Application CAN frame message is allowed to be retransmitted to the series frame The parameter is available only in transparent conversion mode When this option is selected the converter will add the frame information of CAN message at the first byte of the series frame If it is not selected the CAN frame information will not be converted CAN frame identity is allowed to be retransmitted to the series frame The parameter is available only in transparent conversion mode After this option is selected the converter will add frame ID of the CAN message between
26. y configuration software with 0x00 m JT 2505 configuration software SER COM Port Configuration 232 baud rate 9600 CAN baud rate Conversion mode Transparent transmission CAN frame type Standard frame Location of CAN identifier P in the sorlal frame CAN receive filter code 00 00 00 02 Original offset 0 en 00 00 00 01 Identifier length 1 CAN filter mask 00 00 00 00 _ Allow CAN frame ID to be sent to serial data User defined mask Allow CAN frame content to be sent to serial data Set return value Connection Configuration Readout Read configuration all the parameters of the converter will be read and displayed in the panel Writing configuration after the parameters are set click this button to write all the configuration parameters to a converter and set return value to ERO If it is 2 an error will occur 4 Application explanation UT 2505 converter is an intelligent protocol converter It supports three conversion modes transparent conversion transparent conversion with mark Modbus conversion When configuring converter the parameters can be selected and set Transparent conversion means that the converter just converts a bus data format to another bus data format without adding or modifying the data It can not only realize the data format exchange but also do not modify data content in which the converter seems transparent fo
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