AVT-716 MULTIPLE INTERFACE RS-232/422 Unit
Contents
1. N hty Jum aiete Sia Is lt 25 0 3 7 Board 92 connecior P3 s SNS bed RES Ee 26 6 3 8 Board 2 Connector CTEETRCRRRRRESRRTCSCEMRR L m 26 6 4 AVT 716 ENCLOSURE INFORMATION eee ae ae ae ae ee aa ae ae aa aa aa aa aa aa esee 26 6 A4 T Enclosure CONMECIOR Pla esed Smedsin m en DI 6 42 Enclosure ConnectoFP2 5 oen eee Enk tte Dt viet etm Bebe tette iet Boks 27 7 COMPANY OVERVIEW e S oe ee paa erae osea ev Eco et ee aee vba Se KUULUU SAAN SHAN KUSSA 28 FIGURE 1 RS 232 CONNECTOR AND JUMPER CONFIGURATION eeetetehere e e emen ennt eee eee eee eee ese ese e esee esee esse essen 6 FIGURE 2 RS 422 CONNECTOR AND JUMPER CONFIGURATION ecce ene emen ntenetesesesesesese 6 FIGURE 3 AVT 716 HARDWARE INTERFACE UNIT BLOCK DIAGRAM eee eene esee 11 TABLE 1 BAUD RATE SELECTION FIRMWARE V4 9 AND enne na enne eren enne n 7 TABLE 2 BAUD RATE SELECTION FIRMWARE V5 0 AND ABOVE csssssseceessececssseececseceecsesaececsesaececsaeecsesaeeecseaaeeeeseeeeenees 1 INTRODUCTION This manual covers the AVT 716 Multiple Interface hardware It provides technical information on using the interface connections to it communications with it and other related information The AVT 716 Mul2. 2 J1850 Bus 3 CCD 4 Ground chassis 5 Ground signal 7 ISO 9141 K line 9 ALDL 8192 UART 10 J1850 Bus 11 CCD 13 External power 12v nominal 15 ISO 9141 L line 6 4 2 Enclosure connector P2 Connector P2 on the AVT 716 enclosure is a DE 9S connector and will mate to any industry standard DE 9P connector Depending on the configuration of the AVT 716 interface this connector is either an RS 232 or an RS 422 communications port Through this connection the control computer communicates with the AVT 716 Multiple Interface and hence the subject vehicle Hardware handshaking RTS CTS is required for proper operation of the AVT 716 Multiple Interface All signals and directions indicated are relative to the AVT 716 interface RS 232 Configuration Pin Number Name Function Description 1 CD 5v output 2 TXD Transmit Data output 3 RXD Receive Data input 4 DTR connected to DSR pin 6 5 Sig Gnd Isolated from vehicle ground 6 DSR connected to DTR pin 4 7 CTS Clear To Send input 8 RTS Ready To Send output 9 RI not used 27 RS 422 Configuration Pin Number Name Function Description 1 Sig Gnd Isolated from vehicle ground 2 CTS Clear To Send input 3 CTS Clear To Send inverted input 4 RXD Receive data input 3 RXD Receive data inverted input 6 RTS Ready To Send inverted output 7 RTS Ready To Send output 8 TXD Transmit data output 9 TXD Transmit data inverted outp
3. Number Name 1 CD 2 3 TXD 4 CTS 5 RXD 6 RTS 7 9 Sig Gnd 6 3 6 Board 2 connector P2 5v viaa ohm resistor output connected to pin 7 for DTR DSR loop Transmit Data output Clear To Send input Receive Data input Ready To Send output connected to pin 2 for DTR DSR loop Isolated from vehicle ground P2 on the AVT 716 2 board is the RS 422 serial port connection The connector is a 10 position header with pins on 0 100 inch centers The header is compatible with an AMP 111917 1 a 10 position IDC connector Only the indicated pins are connected all others are not connected Pin Number Name Function Description 1 Sig Gnd Isolated from vehicle ground 2 RTS Ready To Send inverted output 3 CTS Clear To Send input 4 RTS Ready To Send output 5 CTS Clear To Send inverted input 6 TXD Transmit data output 7 RXD Receive data input 8 TXD Transmit data inverted output 9 RXD Receive data inverted input 25 6 3 7 Board 2 connector P3 P3 on the AVT 716 2 board is the connection to the vehicle s OBD II port The connector is a 16 position header with pins on 0 100 inch centers The header is compatible with an AMP 111918 3 a 16 position IDC connector Only the indicated pins are connected all others are not connected Pin Signal 2 ALDL 8192 UART 3 J1850 Bus 4 J1850 Bus 5 CCD 6 CCD 7 Ground chassis 9 Ground signal 10 External power
4. electrical and electronic systems This is done to prevent damage to the control computer due to spikes or surges from the vehicle electrical system It is not recommended that the control computer be connected directly to the vehicle electrical system The AVT 716 Multiple Interface performs the data and protocol conversion functions When in VPW mode of operation a Motorola DLC device is utilized When in PWM mode of operation a Motorola HBCC device is utilized ISO 9141 2 and KWP2000 operations are supported by a custom transceiver design GM s ALDL or UART operations are at 8192 baud and are supported by a custom transceiver design Chrysler s CCD operations are supported by a Harris device All firmware on the AVT 716 Multiple Interface was developed by and is supported by Advanced Vehicle Technologies Inc The serial communications function is provided by a Philips Serial Communications Controller SCC device The RS 232 and RS 422 line drivers and receivers are contained in an electrically isolated section of the AVT 716 2 board Signals are coupled through optical isolators and power is supplied by an isolated DC DC converter The AVT 716 Multiple Interface utilizes a Motorola CPU32 core microcontroller All firmware is contained in an EPROM device mounted on AVT 716 board 1 The board set was designed to support the three modes of operation VPW PWM and ISO 9141 2 The selection of operational mode is determined by a software comman
5. responded to the transmitted message node C4 responded affirmatively to receipt of the transmitted message 5 6 ISO 9141 2 Mode Consult the latest version of the Commands and Responses list for detailed information on the commands supported by the AVT 716 while in ISO 9141 2 mode of operation The latest version of the Commands and Responses document can be obtained from our web site at http www avt hq com 5 6 1 ISO Operations The transmission and reception of messages while in ISO mode is very similar to operations while in VPW mode once communications with the vehicle have been initialized successfully When in ISO mode there are several unique operational requirements The user should consult the ANSI ISO specification for operational details Some of these are listed here e Before communications can be conducted between the AVT 716 and the vehicle ECU an initialization sequence must be successfully completed This is accomplished via the 61 02 command If initialization is successful the AVT 716 will respond with 71 03 e Once initialization has been completed successfully communications between the AVT 716 and the ECU must be maintained If more than 5 seconds passes without the AVT 716 transmitting a message the ECU will assume the tester is no longer present Further communications will require that the communications link be re initialized e To maintain communications following successful initialization
6. 12v nominal 13 ISO 9141 K line 14 ISO 9141 L line 6 3 8 Board 2 connector P4 P4 on the AVT 716 2 board enables or disables the high side supply voltage to the entire AVT 716 Multiple Interface board set It is a 2 position header with pins on 0 100 inch centers and is compatible with AMP 640441 2 2 position IDC connector When the interface board set is installed in the supplied enclosure P4 is connected to the front panel toggle switch When the AVT 716 is delivered as an OEM module P4 has a jumper installed 6 4 AVT 716 Enclosure Information The following sections contain information about the AVT 716 Multiple Interface board set mounted in the provided enclosure The AVT 716 board set is available mounted in a rugged polycarbonate enclosure Also included in the enclosure are two internal cable assemblies and a locking toggle switch for unit power 26 6 4 1 Enclosure connector P1 Connector P1 on the AVT 716 enclosure is a DA 15P connector and will mate to any industry standard DA 15S connector It is connected to the subject vehicle OBD II connector through the supplied cable assembly Only the signal lines that the AVT 716 Multiple Interface uses are indicated here In accordance with the standard there may be other signals on the OBD II connector in the vehicle The AVT 716 does not connect to or utilize signals or lines other than those indicated here All other pins on this connector are connected Pin Signal
7. RS 232 operation at 9 6k baud rate Refer to the following instructions and Figures 1 and 2 for details on configuring the AVT 716 serial communications to the host computer To select RS 232 operation e Locate jumper on AVT 716 board 2 Board 2 is the bottom board Place the jumper across pins and 5 on 1 1 e Place the jumper across pins 4 and 6 on 1 1 e Connect the internal serial cable to Pl on AVT 716 2 interface board The internal serial cable is a ribbon cable connected to the enclosure mounted connector P2 it s the narrower of the two cables Figure 1 RS 232 Connector and Jumper Configuration To select RS 422 operation e Locate jumper on AVT 716 board 2 Board 2 is the bottom board e Place the jumper across pins 1 and 3 on 1 1 e Place the jumper across pins 2 and 4 on 1 1 e Connect the internal serial cable to P2 on AVT 716 2 board The internal serial cable is a ribbon cable connected to the enclosure mounted connector P2 it s the narrower of the two cables Figure 2 RS 422 Connector and Jumper Configuration To set the baud rate The baud rate is determined by installing or removing the jumpers on JP1 and JP2 on the AVT 716 board 1 Refer to Table 1 for JP1 and JP2 settings and corresponding baud rates 9 6k 19 2k 38 4k Table 1 Baud Rate Selection firmware v4 9 and below Baud Rate 57 6k In ee Table 2 Baud
8. Rate Selection firmware v5 0 and above 2 2 Hardware Connections Connecting the AVT 716 to the subject vehicle is accomplished via the OBD II compatible cable available from AVT Inc Note this cable is not supplied with the OEM module The cable has a DA 15S connector on one end and an OBD II compatible connector on the other end The DA 15S connector is mated to the DA 15P connector on the AVT 716 enclosure The other end of the cable is mated to the OBD II connector in the subject vehicle Refer to SAE Standard J1962 for a description of the OBD II connector and its location in a vehicle The AVT 716 interface receives operating power from the subject vehicle through this cable as well as power and signal grounds Additionally the cable provides the network connections between the interface and the subject vehicle The AVT 716 interface is connected to the control computer via the supplied 9 pin cable Note this cable is not supplied with the AVT 716 OEM module The cable is compatible with a PC AT standard 9 pin RS 232 connection We cannot guarantee it but direct connection of the AVT 716 interface enclosure to a PC AT 9 pin RS 232 connection using this cable or any straight through wired cable should work without requiring any adapters No other connections or installation is required 2 3 Testing the AVT 716 Once the hardware connections have been made proper operation of the hardware can be observed e Launch the AVT 71
9. To view all bus traffic while in PWM mode the HBCC device can be placed into monitor mode by the control computer via a software command When in this mode the AVT 716 interface becomes a passive PWM network monitor and will not permit transmissions 5 5 1 Look Alike mode The AVT 716 utilizes two different devices and methods of interfacing to the two J1850 buses VPW and PWM As a result messages transmitted and received when in PWM mode are different than if the same message was transmitted or received in VPW mode Therefore a Look Alike mode was developed for use while in PWM operations This mode is defaulted to the Off state to be compatible with previous versions of the AVT 715 unit When Look Alike mode is enabled the construction of a message is such that it looks like its VPW counterpart Each of the following sections describes message construction when Look Alike is enabled on or disabled off 5 5 2 Transmit message format Look Alike mode Off To transmit a message onto the network the message must be built and then passed to the AVT 716 interface The HBCC internal to the AVT 716 will automatically insert the source address and append the CRC All messages destined for transmission onto the network must be constructed as indicated here All packets for transmission must have a byte count from 2 to 9 inclusive Therefore the header 14 byte will have a value of 02 to 09 inclus
10. UART mode are similar to that of VPW mode The user is cautioned that they must have detailed knowledge of how to properly construct a message when in this mode If a message is improperly constructed for transmission erratic operations may result Consult the document AVT 716 8192 UART Mode for a discussion of using the AVT 716 in ALDL or UART mode Note that ALDL mode also supports messages longer than 16 bytes To support this the same format as that used to support long KWP messages is used here Consult Section 5 7 2 for detailed information on these formats 21 5 9 CCD Mode Consult the latest version of the Commands and Responses list for detailed information on the commands supported by the AVT 716 while in CCD mode of operation The latest version of the Commands and Responses document can be obtained from our web site at http www avt hq com 5 9 1 CCD Operations Operations in CCD mode are similar to that of VPW mode 5 10 Match Function A coarse filtering mechanism for messages received from the bus is provided by the AVT 716 Interface unit firmware If the match table is cleared on power up reset or 31 7B command all messages received from the network are passed to the host When at least one entry is made to the match table all messages received from the network are checked against the match table If a match is found the message is passed to the host If no match is found the message is discar
11. n 13 FRMLT RAM Function Read 14 Message Lookup Table Lo s 15 FRDR1 Register B2 Function Read Data 08 Register 1 FRDR2 Register B4 Function Read Data 09 Register 2 17 Value Function Read Data 0A Register 3 FRMLTP Register 14 Function Read 11 Message Lookup Table Pointer SUR Register 16 Start of User s RAM 12 5 5 7 Examples To illustrate the construction and decoding of messages between the control computer and the AVT 716 interface several examples are shown for illustration Example 1 Want to write a byte to a register in the HBCC device Command string 83 01 02 16 Explanation header byte 83 8 is the command for HBCC functions 3 is the number of bytes to follow O1 is the write HBCC register command 02 is the register address 16 is the value of the byte to be written into HBCC register at address 02 This is the command to put the HBCC device into the network monitor mode Example 2 Want to make an OBD II engine temperature query with Look Alike off Commandstring 04 61 6A 01 05 Explanation header byte 04 O indicates that the following bytes are for transmission onto the network by the HBCC and 4 indicates that 4 bytes follow 61 indicates a priority 6 message of type 1 broadcast 6A indicates that the message is only destined to those nodes that recognize function 6A messages diagnostic message The last two bytes 01 and 05 are the actual me
12. test is conducted If the local loopback test passes successfully the HBCC device operational parameters are then set to default parameters and the HBCC network drivers are enabled In the event the HBCC local loopback test fails for any reason an error code is passed to the control computer and the HBCC network drivers are disabled Most HBCC registers and RAM locations are set to default values during PWM mode initialization The following is a list of these registers and RAM locations along a brief explanation of the initialization status and the value written to each location The user should consult the HBCC User s Guide for detailed information on each of the registers RAM and individual bit definitions 16 Value UIMR Register FF User Interrupt Mask 07 Register RCR Register 04 Receive OK interrupt mask Receive Control 01 Receive error interrupt mask Register Receiver overrun interrupt mask Unable to acknowledge interrupt mask Network fault interrupt mask HCR Register 72 Enable network driver A HBCC Control 02 Enable network driver B Register 41 6 kbps never sleep TCR Register 0x Transmit OK interrupt mask Transmit Control 00 Transmit error interrupt mask Register Critical transmit error interrupt mask NAR Register F1 OBD II diagnostic tool address Node Address 10 Register 5A 5B 6A 6B 04 All user interrupt disabled FMLT OBD II diagnostic message Function Message 10 Lookup Table 10 11 no 12 NEN
13. the J1850 standard Operations in J1850 PWM mode conforms to the Ford Motor Company Standard Corporate Protocol SCP The SCP defines network traffic management message construction and other protocol issues The AVT 716 is fully compatible with any similarly equipped Ford Motor Company or Mazda product Operations in ISO 9141 2 mode is in accordance with the ISO standard Operations in Keyword Protocol 2000 is in accordance with ISO standard 14230 The AVT 716 Multiple Interface provides the following functions e Isolated electrical interface between the subject vehicle and the control computer e Protocol data conversion between a vehicle based network and the host computer via a serial communications link Passive network traffic monitor e Performs all functions of an active SCP qualified network node If using the AVT Controller or Capture software please refer to the AVT xxx Controller Software User s Manual Necessary for operation of the AVT 716 Controller software but not provided is a PC AT compatible computer with either an RS 232 or an RS 422 serial port 1 1 Specifications and Requirements AVT 716 Multiple Interface in enclosure e Overall size inches 6 7 wide x 2 2 high x 4 75 deep 5 4 including switch and connectors Weight 19 oz 12 volts nominal from subject vehicle Input voltage range 8 5vdc to 24vdc Power dissipation 1 8 watts nominal AVT 716 Multiple Interface OEM board set e Ove
14. the byte following the header byte is the received message status byte When in PWM mode the byte following the header byte is the message number These bytes are ignored by the match function and are not counted The very next byte is the first byte of the message and has is byte number one of the message 22 5 11 Status and Error Codes Consult the latest version of the Commands and Responses list for a complete list of Status and Error codes supported by the AVT 716 The latest version of the Commands and Responses document can be obtained from our web site at http www avt hq com 6 Technical Information 6 1 Reference Documentation This section contains reference information on the J1850 specification the HBCC device the Standard Corporate Protocol and related technical information These documents should be consulted for additional or detailed information 1 SAE Standard J1850 Class B Data Communications Network Interface Available from the SAE 400 Commonwealth Drive Warrendale PA 15096 0001 phone 412 776 4970 2 ISO standard 9141 2 Road Vehicles Diagnostic Systems Part 2 1994 02 01 3 Ford Motor Company Hosted Bus Controller Chip User s Guide 4 Ford Motor Company SCP Protocol Definition and Interface Requirements Document number ES F7LC 12K529 BA 5 Ford Motor Company SCP Diagnostic Message and Dialogue Requirements Document number ES F7LC 12K529 CA 6 Automoti
15. 6 Controller software or a similar communications program Note that the AVT 716 communicates with the host computer using binary bytes not ASCII digits e Set the parameters of the communications program appropriately as determined by the configuration of the AVT 716 interface Turn on the AVT 716 interface unit Observe on the AVT 716 1 interface board top that the green power LED is lit Observe that the red operations LED is blinking fast Observe on the computer that the following is received from the interface 91 07 This is the mode of operation report 91 indicates that the message is a board status report with one byte to follow The 07 indicates VPW mode of operation Refer to Sections 5 4 5 5 and 5 6 for AVT 716 commands and responses Note The Controller software only displays and accepts hex digits no dollar signs e At this point the AVT 716 hardware is operational 3 Interface Introduction The AVT 716 Multiple Interface is available housed in a rugged polycarbonate enclosure with internal cable assemblies and power switch The two connectors on the enclosure are to the subject vehicle and the control computer The interface provides an isolated electrical interface between the control computer and the vehicle The AVT 716 Interface is connected directly to the vehicle and derives its operating power from the vehicle The serial interface to the control computer is electrically isolated from the vehicle
16. ADVANCED VEHICLE TECHNOLOGIES Inc AVT 716 MULTIPLE INTERFACE RS 232 422 Unit Users Manual 1509 Manor View Road Davidsonville MD 21035 410 798 4038 voice 410 798 4308 fax Revision B May 200 1 TABLE OF CONTENTS I INTRODUCTION ost paso coso si deei ao fuso as base Sa eL Do saan fe Ua ipo PYN LA SSS 4 1 1 SPECIFICATIONS AND REQUIREMENTS ves AVN NASA NIKEN SENNA KISAN Taa 5 1 ELE 2 2 INSTALLATION Rem toc 5 2 1 HARDWARE CONFIGURATION 2 eit late PY ET 5 2 2 HARDWARE CONNECTIONS edente tree ree ote ei t tbe rer entere eet eden 7 2 3 TESTING THE AV T T i ted rer Ium UNE REINO ANNUI e ean maana pe ER WEN FAL UI 7 3 INTERFACE INTRODUCTION eese esee eene tuse ta a sens tastes suse tasse ta 8 4 INTERFACE DESCRIPTION e eeeeeeee eese aCe E En SED E En ni o 8 5 AVT 716 OPERATION onnaa eene aa aa aa a a tassa sosta sone ta sone aa aa aa a tasse ta sens ES Sisi 9 9 1 INDICATORS PE 9 5 2 COMMUNICATIONS ELECTRICAL ANNIN NAISTA 10 5 3 COMMUNICATIONS MESSAGES cccssesscecececsessaececececsessauececcceceessaeaececccseseaseaecececeesessaaececececsesaaeceeececeeseaaeaeeeeeceenees 10 9 3 1 Packet Con
17. COL 2000 MODE itr a NA NVS SAISIN ANSSI USA MA oma Na 20 S UT KWP Operations sse Me d Net pete de ne guit 20 3 7 2 Long Messages M 20 9 8 ALDL OR WART MODE MEE 21 3 T ALDE or UART Operations va 21 PS Ja C0 by Uu PE 22 5 9 T COD Operations d ie epe beeen e eter eie ee hen RR ive lose GAA ise bid eR 22 DLO MATCH FUNCTION de irte aite e i tette obse xe ete iu e rt Pe ea een greens 22 5L T STATUS AND ERROR CODES nein enden iih eem tete ttp eee au 23 6 TECHNICAL INFORMATION ee eeee entente a aan a stato seta tone ta sonata sesto sees sone so sene tasto aa aan a se teens tasse tasto senses snae 23 6 1 REFERENGE DOCUMENTATION marear OPER TOO XT ARR EU an Uer RU te eren 23 0 2 TECHNICAL SUPPORT os ass ma et ERR T e Pr e AA SETA A 23 6 3 AVT 716 MULTIPLE INTERFACE INFORMATION eee eee insere inni 24 6 3 1 Board L jumpers JPL and JRZ s cesse gane ae E a d dede p ie ied diede e RR ne 24 6 3 2 Board 2 fuse ET e eade egeta eddie prt egets ides 24 6 3 3 Board 92 jumper ied uen endi n ree rgo e 24 6 3 4 Board 92 jumper JP2 IPS a ai ere rer ea ER OPER EE REPU GER e eS 24 0 33 Board 92 CONNECION PD es teet reete te S tees esee tede TTT hl 25 6 3 6 2 conhnecior
18. These changes are useful when viewed in the context of OBD II standardized messages Please refer to SAE documents J1979 and J2178 for more details 5 5 4 Receive message format Look Alike mode Off Messages received from the network are assembled into a packet by the AVT 716 interface and then passed to the control computer These messages will have the following form and will have a byte count less than or equal to 0D 15 Byte Description 00 Header byte lower nibble is byte count to follow 01 Message number according to FMLT order 00 node to node FF network monitor 02 Priority Type 03 Target Specifier 04 Source Address 05 to n 1 Data bytes n CRC n lt D 5 5 5 Receive message format Look Alike mode On Messages received from the network are assembled into a packet by the AVT 716 interface and then passed to the control computer These messages will have the following form and will have a byte count less than or equal to 0C With Look Alike mode enabled the CRC byte is dropped when the message is forwarded to the host Byte Description 00 Header byte lower nibble is byte count to follow 01 Message number according to FMLT order 00 node to node FF network monitor 02 Priority Type 03 Target Specifier 04 Source Address 05 ton Data bytes n lt C 5 5 6 HBCC Initialization Parameters When the AVT 716 interface is powered up the HBCC device is initialized and a local loopback
19. andard A custom design is used for the implementation of the ISO 9141 2 and KWP2000 standard A Harris serial multiplexed bus interface device is used to implement the CCD mode of operation A battery backed real time clock is available on the board as well as a free running timer with millisecond accuracy Also available on the board is 8 KBytes of additional RAM available for future growth The on board real time clock is not Year 2000 compliant It reports the year in two digits However the AVT 716 does not utilize the day date information for operations Testing has demonstrated that the AVT 716 continues to operate without interruption when the year rolls over from 1999 to 2000 5 AVT 716 Operation The following describes the use of the AVT 716 Multiple Interface It is assumed that the interface is properly connected to the subject vehicle and to the control computer Furthermore it is assumed that the AVT 716 Controller software or similar communications software has been installed on the control computer that it is running and that the test described in Section 2 3 has been completed successfully 5 1 Indicators The AVT 716 board 1 has two indicator LED s one green and one red The green LED is connected to the 5 VDC supply for the board and provides a quick indication that power is available for normal operation If the green LED should fail to light check the power source from the subject vehicle and check fuse F1 o
20. bytes Example 05 81 F1 Cl 48 9B 20 If the message is more than 15 bytes but less than 255 bytes in length alternate format 1 is available using a header byte of 11 Alternate format 1 11 xx bb 11 header byte XX count of bytes to follow aa bb cc message bytes If the message is more than 255 bytes in length alternate format 2 is available using a header byte of 12 Alternate format 2 12 xx yy aa bb 12 header byte xx count of bytes to follow most significant byte yy count of bytes to follow least significant byte aa bb cc message bytes These formats are backward compatible and may be used as desired For example the host wants to transmit the following message onto the bus A B2 D4 5 F6 A7 B8 C9 DA EB FC AD BE The following messages from the host to the AVT 716 are all equivalent The header byte s have been bolded and underlined for clarity Al B2 D4 5 F6 A7 B8 C9 DA EB FC AD 11 0E Al B2 C3 D4 E5 F6 A7 B8 C9 DA EB FC AD BE 12 00 0E A1 B2 C3 D4 E5 F6 A7 B8 C9 DA EB FC AD BE 5 8 ALDL or UART Mode Consult the latest version of the Commands and Responses list for detailed information on the commands supported by the AVT 716 while in ALDL or UART mode of operation The latest version of the Commands and Responses document can be obtained from our web site at http www avt hq com 5 8 1 ALDL or UART Operations Operations in ALDL or
21. bytes are stripped off 5 4 3 Received Message Status Byte Definitions The received message status byte always follows the header byte even if the status byte is the result of transmitting a message Bit Definition 0 CRC error Incomplete message incorrect number of bits Break received IFR data Lost arbitration Transmission successful From this device Bad message message too short or too long DUE ENS ag 5 4 4 Block Transfer Operations VPW mode of operation supports both 4x and block transfer modes of operation Both of these modes are unique to GM and may be required for some operations Consult the manual supplement Block Data Transfer for additional information on how to use the AVT 716 in block transfer mode 5 4 5 Trigger Function Available only in VPW mode is an external hardware trigger function Consult the document AVT 716 Trigger Function for detailed information on how to use this capability 5 4 6 Examples To illustrate the construction and decoding of messages between the control computer and the AVT 716 interface several examples are provided Example 1 Want to request the current operational mode Command string DO The interface responds with 91 07 The 9 indicates a board response the 1 indicates one byte follows and the 07 indicates VPW mode Motorola device 13 Example 2 want to send a message out on the bus Commandstring 04 32 89 AC 5F The int
22. d timer Board 2 contains the hardware to support the various interfaces 6 3 1 Board 1 jumpers JP1 and JP2 JP1 and JP2 on the AVT 716 1 board are used to select the serial communications port baud rate Set the jumpers for the desired baud rate in accordance with the instructions in Section 2 1 6 3 2 Board 2 fuse F1 Fuse F1 on the AVT 716 2 board is a 500 milliamp fast blow fuse designed to protect the AVT 716 in the event of reverse voltage application or a voltage surge significant enough to trip the input transient voltage suppressor The fuse is a Schurter MSF 125 034 4216 6 3 3 Board 2 jumper JP1 JP1 on the AVT 716 2 board is used to select which serial communications port is active RS 232 or RS 422 The jumpers on JP1 should be set as noted in Section 2 1 6 3 4 Board 2 jumper JP2 JP3 JP4 These jumpers are related to the CCD bus They are installed at the factory JP2 Pulls the CCD bus down to ground through a 12 1 Kohm resistor JP3 Connects across the CCD and CCD bus lines through a 200 ohm resistor JP4 Pulls the CCD bus up to 5v through a 12 1 Kohm resistor 24 6 3 5 Board Z2 connector P1 P1 on the AVT 716 2 board is the RS 232 serial port connection The connector is a 10 position header with pins on 0 100 inch centers The header is compatible with an AMP 111917 1 a 10 position IDC ribbon cable connector Only the indicated pins are connected all others are not connected Pin
23. d from the control computer to the Multiple Interface unit Refer to Section 5 x for detailed information on operations in each of the supported modes 4 Interface Description A block diagram of the AVT 716 Multiple Interface is shown in Figure 3 The heart of the unit is the Motorola 68332 microcontroller This device utilizes a 68000 core with a bus speed of 16 777 MHz Operation firmware is contained in an EPROM Software commands from the control computer control the selection of the operational mode of the interface The microcontroller utilizes several peripheral devices two FIFO s each 2 KBytes deep a DLC device an HBCC device a serial communications controller a real time clock and a millisecond resolution free running timer The two FIFO s are used by the microcontroller as buffers for the transmit and receive operations between itself and the control computer A serial communications controller is used to implement the standard serial data link including RTS CTS hardware handshaking The serial communications controller is interfaced to the control computer through a signal isolation block and either an RS 232 or an RS 422 transceiver block The control computer serial data link is electrically isolated from the rest of the Interface unit and hence the vehicle through an isolated DC to DC power converter and a signal isolation block DLC device implements the J1850 VPW standard The HBCC device implements the J1850 PWM st
24. ded and the host is not notified A match table entry is made using the 32 xx yy command The xx value is the byte position and the yy value is the byte value This filtering mechanism is more easily explained by example It is desired to receive all messages at the host where the third byte of the message is equal to F1 Send the command 32 03 F1 to the AVT 716 interface To verify the table entry send the command 30 The response will be 42 03 F1 The only network messages passed to the host will now be of the form zz xx F1 Note that at the host the message will be ss zz xx F1 where rr is the header byte 555 is the received message status byte and the message follows The match table can hold ten entries where an entry consists of a byte position and a byte value The byte position refers to where in the network message the match byte is to be compared The first byte of the message has a byte position value of one Ordering of the match table is not important All table entries are checked until a match is found or the end of the table is encountered If a match table entry specifies a byte position that doesn t exist for the message being checked the message is shorter than the table entry that table entry is not checked Note that the header byte and the received message status byte are not included in the match function nor are these two bytes considered part of the message When in VPW and ISO modes
25. der byte depends on which direction the data packet is moving whether to or from the control computer Both KWP2000 and ALDL or UART modes of operation support long and very long packet lengths These packets may be as long as 259 bytes For packets of this length an alternate form of packet construction is used 10 Heart Beat LED red Control and monitor signals EPROM Program Memory L S110d FIFO 1 FIFO 2 RS 232 gt Transceivers RS 422 Transceivers Signal Isolation and Selection 19 INdWOn Isolated DC DC Power Source MC68332 Microcontroller Dual Serial Communications Controller Power LED green 4 Power Regulation amp Distribution Transient Protection DLC S VPW Interface To Vehicle HBCC PWM Interface PWM Transceiver K line Transceiver L line Transmitter Figure 3 AVT 716 Hardware Interface Unit Block Diagram 11 Sig Chassis 5 4 VPW Mode Consult the latest version of the Commands and Responses list for detailed information on the commands supported by the AVT 716 while in VPW mode of operation The latest versio
26. erface responds with 01 60 The 0 indicates a received message and the 1 indicates only one byte which is the received message status byte The 60 indicates that bits 6 and 5 are set which means the received message was from this device and the transmission was successful Messages transmitted by the interface are received by the interface are checked for errors but are not echoed back to the controller Only a status byte is passed to the controller to indicate the status of the transmitted message 5 5 PWM Mode Consult the latest version of the Commands and Responses list for detailed information on the commands supported by the AVT 716 while in PWM mode of operation The latest version of the Commands and Responses document can be obtained from our web site at http www avt hq com Operations in PWM mode are different from VPW mode When operating in PWM mode the HBCC device must be initialized for proper operation including a unique node address The HBCC is initialized automatically by the microcontroller in the interface when powered up or reset Refer to Section 5 5 8 for a listing of the initialization parameters for the HBCC device These parameters may be changed by the user from the control computer When in PWM mode of operation the HBCC device performs input message filtering Therefore only bus traffic that is destined for the address of the interface is passed to the control computer and displayed
27. ground The user should be aware of potential communications errors that may occur when using RS 232 at the higher data rates or in an electrically noisy environment When in RS 422 mode the output data lines idle such that TXD is high 4 volts and TXD is low 0 volts The RTS signal idles low 0 volts and RTS is high 4 volts Likewise the AVT 716 expects RXD to idle high RXD is low and CTS is low CTS is high All voltages measured with respect to the communications isolated ground 5 8 Communications Messages The structure and protocol of communications between the control computer and the interface are stated in the following sections 5 3 1 Packet Construction Messages from the host computer to the AVT 716 Interface are known as Commands Message from the AVT 716 Interface to the host computer are known as Responses All data is transferred in packets The size of each data packet varies depending on the mode of operation For most modes the packet length is from 1 byte to 16 bytes inclusive The first byte in each data packet is the header byte and is used to convey information only between the control computer and the microcontroller in the interface The header byte is divided into the upper nibble and lower nibble The upper nibble indicates what information the data packet is conveying The lower nibble is the count of the number of bytes that follow the header byte The meaning of the upper nibble of the hea
28. ive The bytes following the header byte must be in the following form Byte Description 00 Header byte lower nibble is byte count to follow 01 Priority Type Priority 0 Type 0 4 message type 5 is not implemented as an automatic transmit feature 02 Target ID 00 FF 03 09 Data bytes optional 0 to 7 data bytes depending on message type 5 5 3 Transmit message format Look Alike mode On To transmit a message onto the network the message must be built and then passed to the AVT 716 interface The HBCC internal to the AVT 716 will automatically append the CRC All messages destined for transmission onto the network must be constructed as indicated here All packets for transmission must have a byte count from 3 to 10 inclusive Therefore the header byte will have a value of 03 to 0A inclusive The bytes following the header byte must be in the following form Byte Description 00 Header byte lower nibble is byte count to follow 01 Priority Type Priority 0 Type 0 4 message type 5 is not implemented as an automatic transmit feature 02 Target ID 00 FF 03 Source ID e g a scan tool would be F1 04 0A Data bytes optional 0 to 7 data bytes depending on message type An additional function of the Look Alike mode is to check the Priority Type byte If this byte has a value of 68 then its value is changed to 61 Next bit 3 is of the Priority Type byte is cleared
29. n of the Commands and Responses document can be obtained from our web site at http www avt hq com When in VPW mode of operation the interface is always listening to or monitoring the J1850 bus All bus traffic is reported to the control computer by the interface Transmit operations occur only when initiated by the control computer 5 4 1 Transmit message format To transmit a message onto the network the message must be built by the operator and then sent to the AVT 716 The CRC byte will automatically be calculated and appended onto the message when transmitted It is up to the user to determine and know the proper protocol that is implemented on the vehicle to which the AVT 716 is attached Any message destined for transmission must be preceded by a byte whose upper nibble is 0 zero and lower nibble is the byte count of the message The message bytes then follow immediately Once a message is accepted by the AVT 716 interface for transmission the proper transmit CRC byte is appended and transmission of the message commences as soon as possible J1850 requires that a minimum IFS Inter Frame Separation time interval has elapsed on the bus before any node may begin transmission of a new message If while attempting to transmit a message the message loses arbitration the winning received message will have the lost arbitration bit set in the received status byte Refer to Section 5 4 6 for more details on the received me
30. n the AVT 716 board 2 The red LED is a heartbeat indicator The microcontroller toggles the state of the red LED every 62 5 milliseconds As a result the red LED flashes noticeably during normal operations If a problem with the microcontroller should occur the LED will either go to a full ON or full OFF state This should be readily apparent and be indicative of an abnormal condition 5 2 Communications Electrical All communications between the interface and the subject vehicle are in conformance with SAE Standard J1850 and all related standards and recommended practices When in the PWM mode of operation the interface is compliant with the Ford SCP Operations in ISO mode are compliant with ISO specification ISO 9141 2 All communications between the AVT 716 Multiple Interface and the control computer conform at the physical interface to either EIA RS 232 or RS 422 standards as selected by the user Communications between the interface unit and the control computer follow industry standard serial communications protocol There is one start bit eight data bits least significant bit first no parity and one stop bit Additionally hardware handshaking using the RTS CTS signal lines is used When in RS 232 mode the output data line TXD idles low 8 volts and the RTS signal line idles high 8 volts Likewise the AVT 716 expects RXD to idle low and CTS to idle high voltages measured with respect to the communications isolated
31. ode of operation The latest version of the Commands and Responses document can be obtained from our web site at http www avt hq com 5 7 1 KWP Operations Operation in KWP mode is nearly identical to that in ISO 9141 2 mode The big differences are that communications initialization can be accomplished via any of three ways CARB 5 Baud and Fast Initialization The user is recommended to consult the ISO 14230 specification for detailed information on these modes of initialization Consult the document Keyword Protocol 2000 Initialization for detailed information on the initialization sequence for each type of initialization supported by the AVT 716 Also consult the document AVT 716 KeyWord Protocol 2000 Mode for a discussion of how to use the AVT 716 in a KWP2000 environment 5 7 2 KWP Long Messages The KeyWord Protocol 2000 specification supports messages with as many as 255 bytes of data To accommodate these long messages the format for communications between the AVT 716 unit and the host computer has been modified To send a message onto the bus the host has a choice of how to send the message to the 716 unit These are described here along with examples Remember that the AVT 716 unit will automatically compute and append the checksum byte If the message is 15 bytes or less in length total then the normal format may be used Normal Format Ox aa bb cc X count of bytes to follow aa bb cc message
32. or corrections to the document formatting Corrected pin assignments for P3 on Board 2 Section 6 3 6 Corrected technical support phone numbers Corrected spelling of the word Coarse Major revision to reflect the rev E hardware Rev E hardware supports J1850 VPW PWM ISO 9141 2 KWP2000 ALDL UART and CCD Removed all commands and responses Updated the baud rate tables for firmware versions 4 9 and below and 5 0 and above Updated web address and technical support e mail address 29
33. rall size 4 0 wide x 5 6 deep x 1 5 high inches Weight 7 oz 12 volts nominal from subject vehicle Input voltage range 8 5vdc to 24vdc e Power dissipation 1 8 watts nominal 1 2 Definitions The following terms are used in this manual e KWP2000 Keyword Protocol 2000 ISO standard 14230 e HBCC Hosted Bus Controller Chip Motorola Ford Motor Company e SCC Serial Communications Controller device e SCP Standard Corporate Protocol Ford Motor Company e DLC Data Link Controller device Motorola e ECU Electronic Control Unit e g engine controller e All numbers used in this manual are hexadecimal digits 0 9 and A F and are usually preceded with a dollar sign for clarity 2 Installation Prior to using the AVT 716 the type and baud rate of the serial link between it and the host computer must be properly set The interface must then be connected to both the subject vehicle and the control computer 2 1 Hardware Configuration The AVT 716 serial interface can be configured for either RS 232 or RS 422 operation Additionally the data rate can be configured for 9 6k 19 2k 38 4k or 57 6k baud rate These configuration selections are set by jumpers and connectors on the AVT 716 Multiple Interface board set Note documentation by other manufacturers may make reference to 56k baud This is usually the same as what we refer to as 57 6k baud The factory default settings for the AVT 716 are for
34. ssage data bytes mode 1 PID 5 refer to SAE J1979 for more information Example 3 Want to make an OBD II engine temperature query with Look Alike on Command string 05 68 6A F1 01 05 Explanation header byte 05 O indicates that the following bytes are for transmission onto the network by the HBCC and 5 indicates that 5 bytes follow 68 indicates a priority 6 message and type 8 with Look Alike on this byte is replaced with 61 F1 is the source ID 6A indicates that the message is only destined to those nodes that recognize function 6A messages diagnostic message The last two bytes 01 and 05 are the actual message data bytes mode 1 PID 5 refer to SAE J1979 for more information Example 4 Send the message of example 2 and receive the response 22 09 40 Explanation header byte 22 2 indicates HBCC error 2 indicates that two bytes follow 09 is the error code for the HBCC and indicates that an interrupt register 2 IR2 error occurred The last byte is the contents of IR2 A value of 40 in IR2 indicates that a transmit error limit expired 18 This error indicates that no node responded with confirmation of reception of the message no node answered Example 5 Send the message of example 2 and receive the response 41 C4 Explanation header byte 41 4 indicates that the message was transmitted OK at least one node responded and the 1 indicates one byte follows The byte C4 is the address of the node that
35. ssage status byte If the message is properly transmitted a received message status byte is sent to the control computer The transmitted message echo is received by the interface but is not sent to the control computer unless requested by the 5x 06 command Example a message is sent to the interface for transmission at some later time the interface will report 01 60 which indicates that the message was transmitted correctly and that the message was received from itself 5 4 2 Receive message format Messages received from the network are assembled into the original byte sequence The received CRC is calculated and checked to be equal to C4 Both transmitted and received CRC bytes are then discarded A received message status byte is constructed and prepended onto the message A header byte is then prepended onto the message ahead of the received status byte This byte sequence is then sent to the host computer 12 As an example the byte sequence A7 B6 C5 plus CRC byte is transmitted by a node The transmitted message is received by the interface and the following byte sequence is passed to the control computer 04 00 547 B6 C5 The byte 04 indicates that it is a received message and that four bytes follow The byte 00 is the received message status byte and indicates that no errors were found Received message status byte bit definitions are listed in the next section The message bytes then follow Note that the CRC
36. struction ies ee 10 5 4 VPW MODE 3 itc ettet MASS SAE Pert Te Pane ei tet eho waa 12 AE Transmirmessageorm lt ede e ee ERR OR EHE ER ERU REN EE GE RU en KSK RES 12 2 4 2 Receive MESSAGE TOral i uses n e RR tH HU ERE DN amen aa dte elder 12 5 4 3 Received Message Status Byte Definitions eese eee enne ea a ae teneret teen nest rennen ene 13 54 4 Block Transfer Operations tee pio Enea 13 ru 13 ub OsExamples eau fave GA eas Aa eA SN e E CSS 13 3 23 PWM MODE pen EE ae Uto ibat ieu eet pn pe ede 14 5 5 1 Look Alike mode e a ee edet ident de Tao Fere dne sea aed dee fe KA EE sade eie redde ene 14 5 5 2 Transmit message format Look Alike mode Off 14 5 5 3 Transmit message format Look Alike mode 15 5 5 4 Receive message format Look Alike mode eene a a aa aa aa 15 5 5 5 Receive message format Look Alike mode 16 5 5 6 HBC CAN alization Parameters este p ERE 16 2 9 s RU DATNE esce ERREUR EN uote en 18 235 6 150 9 141 2 MODE teet nti icit ctor R eee 19 3 6 1 ISO Operdfionssos sg edel eL e ee 19 5 7 KEYWORD PROTO
37. the AVT 716 will automatically transmit a keep alive message to the vehicle every 4 seconds if another message is not transmitted first as initiated by the control computer The default keep alive message is a mode 1 PID 0 diagnostic request The keep alive message can be changed or deleted by the user through the 5x 04 and 51 05 commands Operations are permitted that do not require successful initialization This operational mode is obtained via the 61 04 command Using that command and the 53 03 xx yy command the AVT 716 can be connected to the ISO bus K line communications on the line can be monitored and messages transmitted This mode omits or bypasses some ISO 9141 2 communications requirements When operating in this mode the user is cautioned to be aware 19 When operating in the non initialized mode 61 04 the baud rate of communications is defaulted to be 10 4 kbps bits per second This baud rate can be changed by the user through the 53 03 xx yy command The bytes xx and yy are the upper and lower bytes respectively of a timer load This number can be calculated according to the following formula The default timer load is 00 0B for a default baud rate of 10 4 kbps 3 6864 10 Timer Load 2169 Baud Rate 5 7 Keyword Protocol 2000 Mode Consult the latest version of the Commands and Responses list for detailed information on the commands supported by the AVT 716 while in KWP m
38. tiple Interface supports the following modes of operation e J1850 VPW Variable Pulse Width e J1850 PWM Pulse Width Modulation e ISO 9141 2 Keyword Protocol 2000 ISO 14230 GM s ALDL or UART 8192 baud Chrysler s CCD The AVT 716 Ready To Use package consists of the AVT 716 Multiple Interface board set housed in an enclosure the Controller software a serial cable an OBD II compatible cable and this User s Manual The AVT 716 Hardware Only package consists of the AVT 716 Multiple Interface board set housed in an enclosure a serial cable an OBD II compatible cable and this User s Manual The AVT 716 OEM module consists of the AVT 716 Multiple Interface board set only All connections to the interface board set are identified in Section 6 3 Federal law and some State laws require that all 1996 model year and later vehicles be equipped with any one of three network interfaces for connection and communications with off vehicle test and diagnostic equipment The three network standards are SAE J1850 VPW J1850 PWM and ISO 9141 2 None of these standards are compatible with the others Operations in J1850 VPW mode is in accordance with the J1850 standard Additionally transmit and receive operations are permitted at 4 times the normal rate This 4X mode of operation may be required for some GM Class 2 operations Note that IFR s with respect to the normalization bit are handled exactly the opposite as is recommended in
39. ut 7 Company Overview Advanced Vehicle Technologies Inc is dedicated to providing affordable hardware software and technical support to the developers and users of vehicle based networks AVT Inc also offers other vehicle network products including AVT 1850 1 J1850 VPW Development System AVT 715 Dual J1850 Interface RS 232 422 unit AVT 921 Dual J1850 Interface an 8 bit ISA board AVT 931 Dual J1850 Interface PC 104 form factor Contact the factory for information on these products and our latest offerings The engineering staff at AVT Inc is experienced with multiplex bus standards including J1850 VPW and PWM and ISO 9141 and 9141 2 Members of the staff are available to provide assistance on the use of any of AVT s products AVT engineering staff members are available to provide dedicated engineering support for a customer project Through a simple contractual arrangement a customer is able to tap into AVT s knowledge and experience base Information on any of the products or engineering support that Advanced Vehicle Technologies can provide is available by calling faxing or writing Advanced Vehicle Technologies Inc 1509 Manor View Road Davidsonville MD 21035 410 798 4038 voice 410 798 4308 fax Home http www avt hq com e mail support avt hg com 28 Revision Record Al A2 A3 Bl B2 Original release Added a couple of new error messages Made several min
40. ve Multiplexing Technology Papers from the 1995 SAE World Congress SAE publication SP 1070 Papers from the 1996 SAE World Congress SAE publication SP 1137 Papers from the 1997 SAE World Congress SAE publication SP 1224 Available from the SAE 400 Commonwealth Drive Warrendale PA 15096 0001 phone 412 776 4970 6 2 Technical Support The user may contact Advanced Vehicle Technologies Inc for assistance in any of the areas covered here When calling please be prepared to identify yourself and tell us the serial number of your hardware Advanced Vehicle Technologies Inc is located in Maryland and is open from 0800 hrs to 1800 hrs Eastern Time If calling after hours please leave a message and we will return your call as quickly as possible You may also fax your questions to us We will either fax an answer back or call you at your request If faxing your question please include as much relevant information about your question or problem as you can 23 We can be contacted Voice 410 798 4038 Fax 410 798 4308 or by E mail at support avt hg com 6 3 AVT 716 Multiple Interface Information Information about the enclosure is contained in Section 6 4 The following sections contain information about the AVT 716 Multiple Interface board set The board set consists of two boards AVT 716 1 is the top board and AVT 716 2 is the bottom board Board 1 contains the microcontroller memory UART real time clock and millisecon
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