DIP053 Quad PC/AT to CAN Adapter Module Operation and
Contents
1. P8 JUMPER BLOCK To Pwr 4 o o BUS PC 12 sourceo o PC 12 source N C o o NC To Pwr o o BUS PC Gnd o o PC Gnd These jumper options should be used when the BUS and BUS GND signals are to be used to power the transceiver P2 P8 JUMPER BLOCK To Pwr bo o BUS PC 412 a o o PC 412 source N C oo NC To Pwr o o BUS PC Gnd o o PC Gnd These jumper options should be used when the PC 12 power is to be used to power the transceiver Note that this configuration does not provide galvanic isolation between the CAN network and the PC To Pwr 4 o o BUS PC 12 source o o PC 12 source N C oo NC To Pwr o o BUS PC Gnd o o PC Gnd A third option allows the PC power to power both the local transceivers as well as the CAN network Current limiting devices on the DIP053 restrict the available bus power to 100 mA for each CAN channel Terminating Resistors Jumper options are included to provide a 120 ohm 1 2 watt termination resistor resident on the DIP053 for each channel install the jumper to enable the terminating resistor Jumper Channel E1 E2 Channel 0 E3 E4 Channel 1 E5 E6 Channel 2 E7 E8 Channel 3 INSTALLING THE DIP053 The DIPO53 PC to CAN adapter may be installed in an ISA compatible Personal Computer The module occupies 16 consecutive locations within the processor I O space Prior to installation the user must set both the base address and the interrupt level to be used by the2. are OR d to drive a single interrupt line on the PC backplane To assist in interrupt handling the processor may read parallel port 2 of channel 0 to determine which of the four units generated the interrupt request Multiple devices may have outstanding interrupts Interrupts are a very scarce resource on heavily populated personal computers The following table shows the standard use of interrupts for AT and 386 486 machines The interrupt level is determined using the DIP switch positions 4 6 The hexadecimal values in parenthesis are the corresponding interrupt level to be coded in the SDSMON and DNETMON initialization files Switch Interrupt S6 S5 S4 OFF OFF OFF 363 OFF OFF ON 4 4 OFF ON OFF 5 5 OFF ON ON 7 7 ON OFF OFF 10 A ON OFF ON 11 B ON ON OFF 12 C ON ON ON 15 FB Normal Usage COM2 4 COM1 3 LPT2 Network CD LPTI General I O General I O General I O General I O Auxiliary Switches The DIP053 provides two unused switch positions which may be used to provide auxiliary information to the application software Standard DIP device drivers use this information to deter mine the number of channels available on the adapter The information is available on parallel port 2 of channel 0 When used with DIP device drivers the following interpretation is given to switch positions S7 and S8 Switch Populated Normal Usage S8 S7 OFF OFF 1 One 82C527 OFF ON 2 Two 82C527 ON OFF 3 Three 82C527 ON ON 4 Fou
3. 2C250 CAN transceivers which provide an ISO DIS 11898 compatible CAN bus interface The isolated side of the opto couplers include a separate power regulator which derives power from either the CAN bus or the PC power Power detection circuitry provides a signal back to the 82C527 to indicate that bus power is available Optical Isolation The HCPL7101 optical isolators will support data rates up to 1 megabit second The circuits are biased such that if the CAN controller 82C527 disables the output drive signals then the corre sponding CAN signals enter a submissive level This circuitry is required to support listen only and autobaud capability Each channel has a separate bus power regulator Power may be routed from the external CAN bus power or from the internal PC 12 volt power Missing Cable Detect Hardware support to detect a missing cable no bus power is provided for each channel The information is available through the 82C527 general purpose parallel port interface port P1 bit 0 If internal power is used the missing cable detection function is disabled and the CAN chan nel is not optically isolated CAN Bus Interface Each CAN channel may be routed to a separate DB 9 connector Two connectors are mounted directly on the adapter The third and fourth channels are pinned out to ribbon headers designed to map to two additional DB 9 connectors mounted on standard PC metal peripheral adapter shells In
4. DIP053 QUAD PC AT TO CAN ADAPTER MODULE 14005301 D I P Inc P O Box 9550 Moreno Valley CA 92552 9550 909 924 1730 TABLE OF CONTENTS INTRODUCTION 1 HARDWARE DESCRIPTION 1 Optical Isolation 2 Missing Cable Detect 2 CAN Bus Interface 2 DIP053 Connector Pin Out 3 Network Jumpers 5 Transceiver Power 5 Terminating Resistors 7 INSTALLING THE DIP053 7 Base Address 7 Interrupts 9 Auxiliary Switches 10 DIP053 SPECIFICATIONS 11 Please Note MKS Instruments provides these documents as the latest version for the revision indicated The material is subject to change without notice and should be verified if used in a critical application INTRODUCTION The DIP053 provides a general purpose quad CAN bus interface for IBM PC AT based personal computers The unit relies on the Intel 82C527 CAN interface component to provide access to the CAN network The hardware interface includes optical isolation for the CAN signals reverse polarity protection for the CAN bus power and signal lines an
5. adapter Base Address The 82C527 requires two byte addresses for the processor interface and a single interrupt line The four controllers occupy 16 consecutive addresses in the PC address space with each 82C527 positioned at an even bus address The I O base address is selectable from 1 of 8 unique addresses allowing a system to potentially contain up to 8 DIP053 s For each channel the pointer register is located at an even address The data register is located at odd addresses To read write a specific 82C527 register the register number must be loaded to the pointer register and then the data read written using the data register Switch Address S3 S2 SI OFF OFF OFF 200 H OFF OFF ON 240H OFF ON OFF 280H OFF ON ON 2C0H ON OFF OFF 300 H ON OFF ON 340H ON ON OFF 380H ON ON ON 3C0H Auto increment allows for faster transfers by automatically incrementing the register pointer after each read or write to the data register Base Description Channel 0 pointer register Channel 0 data register Channel pointer register Channel data register Channel 2 pointer register Channel 2 data register Channel 3 pointer register Channel 3 data register UaoOWR WN KY o Reserved Channel 0 data register auto increment Reserved Channel data register auto increment Reserved Channel 2 data register auto increment Reserved Channel 3 data register auto increment yu m UGO ty gt JO n Interrupts The 82C527 interrupt lines
6. d a circuit to detect when the CAN bus power is removed Application software interfaces to the DIPO53 through an interrupt driven device driver Commands are available to configure both the PC specific interface as well as the CAN network parameters The DIP053 will support both SDS and DeviceNet systems The unit is supported by two software monitor packages which provide a simple engineering level interfaces to the networks The SDS053 software operates with the DIP053 PC to CAN adapters to provide a convenient system development tool for SDS based CAN networks The monitor operates under MS DOS version 3 1 and above The DNETO53 software operates with the DIP053 PC to CAN adapters to provide a conve nient system development tool for DeviceNet based CAN networks HARDWARE DESCRIPTION The 82C527 CAN controller provides 256 internal registers shared between 15 CAN mes sage buffers and a set of general purpose configuration registers and I O ports The device appears to the PC AT bus as two interface registers a data POINTER and a data VALUE The data pointer may be set to auto increment to speed up multi byte transfers Internal interrupt hardware will automatically prioritize interrupt requests to the single hardware interrupt pin Extensive interrupt masking may be done The 82C527 CAN signals are routed to HCPL7101 opto couplers which provide 1 megabit data transfer capability The opto couplers in turn are routed to Signetics 8
7. nel 2 to P1 per above Ell E12 CAN2L El2 E14 BUS E15 E16 BUS E17 E18 CAN3H Connects Channel 3 to P3 per above E19 E20 CAN3L E21 E22 BUS E23 E24 BUS A third option allows all four channels to be connected to a ribbon header which in turn can connect through to a DB 26 or other external connector P7 DB 26 Function 1 1 Channel 0 CAN H 2 14 Channel 0 BUS Gnd 3 2 Channel 0 CAN L 4 15 Channel 0 BUS Gnd 5 3 Channel 1 CAN H 6 16 Channel 1 BUS Gnd 7 4 Channel 1 CAN L 8 17 Channel 1 BUS Gnd 9 5 Channel 2 CAN H 10 18 Channel 2 BUS Gnd 11 6 Channel 2 CAN L 12 19 Channel 2 BUS Gnd 13 7 Channel 3 CAN H 14 20 Channel 3 BUS Gnd 15 8 Channel 3 CAN L 16 21 Channel3 BUS Gnd 17 9 Channel 0 BUS 18 22 Channel 0 BUS 19 10 Channel 1 BUS 20 23 Channel 1 BUS 21 11 Channel 2 BUS 22 24 Channel 2 BUS 23 12 Channel 3 BUS 24 25 Channel 3 BUS 25 13 No Connect 26 No Connect Network Jumpers The DIPOS3 is provided with an optically coupled CAN transceiver To provide full isolation between the CAN network and the PC the transceiver circuit requires a separate power source This is typically provided by a network wide power supply carried on the BUS and BUS GND signals Transceiver Power Each channel has a 10 position jumper block to allow selecting the power source Jumper Block Description P2 Channel 0 power selector P4 Channel power selector P6 Channel 2 power selector P8 Channel 3 power selector P2
8. r 82C527 10 DIP053 SPECIFICATIONS Size 8 X 4 5 ISA BUS COMPATIBLE Power 5 volt 100 mA 12 volt 80 mA bus Bus Interface optical isolation ISO DIS 11898 Bus Speed up to 1 Mbit sec 120 nodes Interrupt Levels 3 4 5 7 10 11 12 15 user selectable I O Addresses 200 240 280 2C0 300 340 380 3C0 ORDERING INFORMATION DIP053 Quad PC to CAN Bus Interface Adapter DIP053 DRV C based interface example code 13005301 DIPO53 User Manual CANMONS3 MONITOR SOFTWARE FOR DIP053
9. some applications it may be desired to provide an alternate pin out for the two on board DB 9 connectors to allow all four CAN channels to be routed to the on board connectors The pin out for the DB 9 connectors is shown below The alternate function indicates the pin out which allows four can channels to be mapped to the two on board DB 9 connectors When the alternate function pin out is used CAN channels 0 and 2 will be grouped on one connector and channels 1 and 3 on the second connector The channels have individual pins for bus power ground and signal leads The shield connected internally to chassis ground share a common connection DIP053 Connector Pin Out The DIP053 pin out for the DB9 connectors are as follows DB 9 Function Alternate Function 1 none CAN L 2 3 2 CANL CAN L 0 1 3 BUS BUS 0 1 4 none BUS 2 3 5 none CAN H 2 3 6 Shield Ground Shield Ground 7 CAN H CAN H 0 1 8 none BUS 2 3 9 BUS BUS 0 1 In the normal configuration each of the four CAN channels are connected to a separate DB 9 connector External 10 pin header to DB 9 cable assemblies are required for channels 3 and 4 Channel Connector 0 PI 1 P3 2 P5 reguires 10 pin to DB 9 cable 3 P9 reguires 10 pin to DB 9 cable To enable channels 2 or 3 to be routed to connectors P1 or P3 as shown in the Pin out table above it is necessary to install four jumpers as shown below Jumpers Description E9 E10 CAN2H Connects Chan
Download Pdf Manuals
Related Search