Digi BL1800 user manual Programming Port, 485 R16

Page 34

The Jackrabbit comes with a 220 Ω termination resistor and 681 Ω bias resistors already installed, as shown in Figure 12.

bias

R18

 

681 W

6

485+

 

R17

 

termination

 

220 W

7

485–

R16

 

bias

 

681 W

 

U6

U1

GND

J1

J2

VIN GND

 

J3

J4

GND

 

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PA0

 

 

 

PA1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PA2

 

 

 

PA3

 

 

 

 

 

 

 

 

 

 

 

 

U5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PA4

 

 

 

PA5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PA6

 

 

 

PA7

U3

 

 

 

 

 

GND

 

 

 

GND

 

PB0

 

 

 

PB1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PB2

 

 

 

PB3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PB4

 

 

 

PB5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PB6

 

 

 

PB7

 

Rabbit

 

 

2000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WDO

 

 

 

PCLK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

PE7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PE6

 

 

 

PE5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PE4

 

 

 

PE3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PE2

 

 

 

PE1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PE0

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HV0

 

 

 

HV1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HV2

 

 

 

HV3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K

 

 

 

+RAW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

VCC

 

 

 

 

Y3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

JACKRABBIT Z-World, Inc.

U4

 

 

-232

 

J5

RS

 

VCC

GND

 

 

RXB

RXC

 

TXB

TXC

 

PC0

PC1

 

PC2

PC3

SRAM

PC4

PC5

PC6

PC7

 

 

AD0

AGND

 

DA0

DA1

 

PD0

PD1

 

PD2

PD3

 

PD4

PD5

 

PD6

PD7

R16

GND

GND

485–

485+

U6

VCC

VCC

SM0

SM1

 

 

IOBEN

STAT

RS-485

GND

VBAT

/RST

GND

R18

RESET

 

R17

Figure 12. RS-485 Termination and Bias Resistors

The load these bias and termination resistors present to the RS-485 transceiver (U6) limits the number of Jackrabbits in a multidrop network to one master and nine slaves, unless the bias and termination resistors are removed. When using more than 10 Jackrabbits in a multidrop network, leave the 681 Ω bias resistors in place on the master Jackrabbit, and leave the 220 Ω termination resistors in place on the Jackrabbit at each end of the network.

3.5.3 Programming Port

The Jackrabbit has a 10-pin program header labeled J3. The programming port uses the Rabbit 2000’s Serial Port A for communication. Dynamic C uses the programming port to download and debug programs.

The programming port is also used for the following operations.

•Cold-boot the Rabbit 2000 after a reset.

•Remotely download and debug a program over an Ethernet connection using the RabbitLink EG2110.

•Fast copy designated portions of flash memory from one Rabbit-based board (the master) to another (the slave) using the Rabbit Cloning Board.

Alternate Uses of the Serial Programming Port

All three clocked Serial Port A signals are available as

•a synchronous serial port

•an asynchronous serial port, with the clock line usable as a general CMOS input

The serial programming port may also be used as a serial port via the DIAG connector on the serial programming cable.

30

Jackrabbit (BL1800)

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Contents Jackrabbit BL1800 Programmable Single-Board ComputerTrademarks Digi International IncTable of Contents Index Schematics Features IntroductionJackrabbit Features Development and Evaluation ToolsAdditional Product Information How to Use This ManualOnline Documentation Immunity CE ComplianceEmissions Design Guidelines General SafetyInterfacing the Jackrabbit to Other Devices Jackrabbit BL1800 Development Kit Contents Getting StartedDevelopment Hardware Connections Board Attach Jackrabbit to Prototyping BoardConnect Programming Cable Assemble AC AdapterConnect Power Installing Dynamic C Troubleshooting Run a Sample ProgramReal-Time Clock Where Do I Go From Here?Technical Support Subsystems BL1800Jackrabbit Pinouts HeadersDigital Inputs/Outputs Digital InputsDigital Outputs HV3 Sourcing OutputConfigurable High-Current Output Bidirectional I/O Changing HV3 to a Sinking OutputSchematic Diagram of A/D Converter A/D ConverterJackrabbit BL1800 Schematic Diagram of D/A Converters D/A ConvertersV ⋅ 1 e RC 1 DA1Typical DA1 Voltages for Various Duty Cycles 2 DA0 Typical DA0 Voltages for Various Duty CyclesUser’s Manual 1 RS-232 Serial Communication2 RS-485 Ground recommended Programming Port 485 R16User’s Manual Changing Between Program Mode and Run Mode Programming CableSram MemoryFlash Eprom External Interrupts Other HardwareClock Doubler Spectrum Spreader Jackrabbit BL1800 Software Reference An Overview of Dynamic CJackrabbit BL1800 Sample Programs Jackrabbit Sample ProgramsDEMOJR1.C Sample Program DEMOJR1.CSingle-Stepping Watch Expression Break PointEditing the Program Summary of FeaturesWatching Variables Dynamically User’s Manual Other Sample Programs Illustrating Digital I/O R/W pin and DB0-DB3 on 3 RS-232 Serial Communication Sample Programs 4 RS-485 Serial Communication Sample Program Cooperative Multitasking Int vswitch Advantages of Cooperative Multitasking Jackrabbit Function Calls 1 I/O DriversVoid digOutint channel, int value Void anaOutint channel, int value Void anaInint channel, int *value Serial Communication Drivers Patches and Bug Fixes Upgrading Dynamic CAdd-On Modules Appendix A. Specifications Electrical and Mechanical Specifications Figure A-1shows the mechanical dimensions for the JackrabbitTable A-1. Jackrabbit Board Specifications Exclusion Zone Exclusion ZonesFigure A-3. User Board Footprint for Jackrabbit Jumper Configurations Figure A-4. Location of Jackrabbit Configurable PositionsTable A-2. Jackrabbit Jumper Configurations Conformal Coating Conformally coated areaUse of Rabbit 2000 Parallel Ports JackrabbitTable A-3. Jackrabbit Pinout Configurations PD0 PD1 Jackrabbit BL1800 Appendix B. Prototyping Board Jackrabbit Connectors User LEDs Buzzer Prototyping Board OverviewPrototyping Board Features Mechanical Dimensions and Layout Top SideUsing the Prototyping Board Top SideDemonstration Board RelayExisting Prototyping Board Top SidePE0 VCC HV0 SM1 SM0 HV2 Stat Jackrabbit BL1800 Appendix C. Power Management Power SuppliesDcin Current mA Batteries and External Battery Connections 950 mA·h = 5.4 years 20 µABattery Backup Circuit Figure C-5shows the Jackrabbit battery backup circuitryPower to Vram Switch Reset GeneratorFigure C-7shows a schematic of the chip select circuit Chip Select CircuitJackrabbit BL1800 Index SMODE0 SMODE1RABDB01.C RABDB02.C Schematics
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