Serial Communication, Serial Ports | Digi RCM4000 instruction

4.2 Serial Communication

The RCM4000 module does not have any serial transceivers directly on the board. How- ever, a serial interface may be incorporated on the board the RCM4000 is mounted on. For example, the Prototyping Board has an RS-232 transceiver chip.

4.2.1 Serial Ports

There are five serial ports designated as Serial Ports A, B, C, D, and F. All five serial ports can operate in an asynchronous mode up to the baud rate of the system clock divided by 8. An asynchronous port can handle 7 or 8 data bits. A 9th bit address scheme, where an additional bit is sent to mark the first byte of a message, is also supported.

Serial Port A is normally used as a programming port, but may be used either as an asyn- chronous or as a clocked serial port once application development has been completed and the RCM4000 is operating in the Run Mode.

Serial Port B is used by the A/D converter, and is not available for other use off the RCM4000, but is available on the RCM4010.

Serial Ports C and D can also be operated in the clocked serial mode. In this mode, a clock line synchronously clocks the data in or out. Either of the two communicating devices can supply the clock.

Serial Ports F can also be configured as an SDLC/HDLC serial port. The IrDA protocol is also supported in SDLC format by this serial port.

Table 3 summarizes the possible parallel port pins for the serial ports and their clocks.

Table 3. Rabbit 4000 Serial Port and Clock Pins

	TXA	PC6, PC7, PD6		TXD	PC0, PC1

Serial Port A	RXA	PC7, PD7, PE7	Serial Port D	RXD	PC1, PD1, PE1

	SCLKA	PB1		SCLKD	PD0, PE0, PE3, PC3

	TXB	PC4, PC5, PD4		TXF	PD6, PE6, PC6

Serial Port B	RXB	PC5, PD5, PE5	Serial Port F	RXF	PD3, PE3, PC3

	SCLKB	PB0		RCLKF	PD1, PE1, PC1
	SCLKB	PB0		RCLKF	PD1, PE1, PC1

	TXC	PC2, PC3		TCLKF	PD0, PE0, PC0

Serial Port C	RXC	PC3, PD3, PE3		TCLKF	PD0, PE0, PC0

	SCLKC	PD2, PE2, PE7, PC7

RCLKF must be selected to be on the same parallel port as TXF.

30	RabbitCore RCM4000

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Digi RCM4000 user manual Serial Communication, Serial Ports, Rabbit 4000 Serial Port and Clock Pins

Contents

RabbitCore RCM4000 Trademarks Rabbit Semiconductor Table of Contents Software Reference Appendix C. Power Supply 109 RabbitCore RCM4100 Introduction RCM4000 Features RCM4000 FeaturesFeature RCM4000 RCM4010 Advantages of the RCM4000 Development and Evaluation Tools 1 RCM4000 Development Kit Software Online Documentation RabbitCore RCM4000 Install Dynamic C Getting Started Hardware Connections Prepare the Prototyping Board for Development Attach Module to Prototyping Board Prototyping Board AC Adapter Connect Programming Cable Connect Power Troubleshooting Run a Sample ProgramRun a Sample Program Where Do I Go From Here? Technical Support RabbitCore RCM4000 Running Sample Programs Introduction Sample Programs User’s Manual Use of Nand Flash RCM4000 only Click OK or Close to exit the various dialog boxes Serial Communication User’s Manual 3 A/D Converter Inputs RCM4000 only Real-Time Clock Hardware Reference RabbitCore Module RCM4000 Digital Inputs and Outputs Shows the RCM4000 pinouts for header J3 4000 RCM4000 Pinout Configurations Pin Pin Name Default Use Alternate Use TXD PC0 PE1 Memory I/O Interface Other Inputs and Outputs Rabbit 4000 Serial Port and Clock Pins Serial CommunicationSerial Ports Ethernet Port RJ-45 Ethernet Port Pinout Programming Port Changing Between Program Mode and Run Mode Programming Cable Standalone Operation of the RCM4000 A/D Converter RCM4000 only Resistor Divider Network for Analog Inputs It is not referenced to 1 A/D Converter Power Supply Analog Supply Circuit Other Hardware Clock DoublerSpectrum Spreader Memory SramFlash Eprom Nand Flash RabbitCore RCM4000 Software Reference More About Dynamic C RabbitCore RCM4000 Dynamic C Function Calls Digital I/OSerial Communication Drivers Sram Use RabbitCore RCM4000 Prototyping Board Functions Board Initialization Void timedAlertunsigned long timeout Alerts ADS7870 Signal ADS7870 State RCM3400 Function/State Analog Inputs RCM4000 only On write operations Data value on read operations Unsigned int anaInDriverunsigned int cmd, unsigned int len Gain Code Multiplier AnaInConfig, anaIn, brdInit Single Diff Gain Code Multiplier Voltage Range ×10 ×16 ×20 126 Applies to Prototyping Board If successful If not able to make calibration constants Float anaInVoltsunsigned int channel, unsigned int gaincode Channel Code Single-Ended Voltage Range † Input Lines Float anaInDiffunsigned int channel, unsigned int gaincode Float anaInmAmpsunsigned int channel Channel Code 20 mA Input Lines Allchan Gain Code Voltage Range +AIN7 AIN6 Gain Code Voltage Range Upgrading Dynamic C Add-On Modules RabbitCore RCM4000 Using the TCP/IP Features TCP/IP Connections RabbitCore RCM4000 TCP/IP Primer on IP Addresses Typical Corporate Network IP Addresses Explained How IP Addresses are Used Dynamically Assigned Internet Addresses Placing Your Device on the Network Direct Connection Using a Hub Running TCP/IP Sample ProgramsDirect Connection How to Set IP Addresses in the Sample Programs How to Set Up your Computer for Direct Connect Direct Connection PC to RCM4000 Module Run the PINGME.C Sample Program Running Additional Sample Programs With Direct Connect Where Do I Go From Here? RabbitCore RCM4000 Appendix A. RCM4000 Specifications Electrical and Mechanical Characteristics Dia × Exclusion Zone Table A-1. RCM4000 Specifications Parameter RCM4000 RCM4010 Ten 8-bit timers 6 cascadable from the first Table A-2 Converter Specifications 1 A/D ConverterParameter Test Conditions Headers Figure A-3. User Board Footprint for RCM4000 Rabbit 4000 DC Characteristics Table A-4 .3 Volt DC CharacteristicsSymbol Parameter Maximum Rating Symbol Parameter Min Typ Max I/O Buffer Sourcing and Sinking Limit Bus LoadingTable A-5. Capacitance of Rabbit 4000 I/O Ports Table A-6. External Capacitive Bus Loading -40C to +85C Iord Table A-8. Preliminary Data and Clock Delays Output Delay30 pF 60 pF 90 pF Ns setting No dbl / dbl Clock to Address Worst-Case Conformal Coating Conformally coated Area Jumper Configurations Table A-9. RCM4000 Jumper ConfigurationsHeader Description Pins Connected Factory Default RabbitCore RCM4000 Appendix B. Prototyping Board Current Measurement Headers RCM4000 Prototyping Board Features RabbitCore RCM4000 Mechanical Dimensions and Layout 935 Power Supply Table B-1. Prototyping Board SpecificationsParameter Specification Using the Prototyping Board Signals Pin Pin Name Prototyping Board Use Adding Other Components Measuring Current Draw Analog Features RCM4000 only Table B-3. Positive A/D Converter Input Voltage Ranges3.1 A/D Converter Inputs Table B-4. Differential Voltage Ranges Mode Read Calibrate Thermistor Input3.3 A/D Converter Calibration Table B-5. Prototyping Board Serial Port Configurations Serial Port Header Default Use Alternate Use 4.1 RS-232 Prototyping Board Jumper Configurations Table B-6. RCM3400 Prototyping Board Jumper Configurations JP5 LN4IN-LN6IN 108 Appendix C. Power Supply Power SuppliesBattery-Backup Circuits Reset Generator 165 mA·h = 2.5 years User’s Manual 111 112 Index SMODE0 SMODE1 ADCALALL.C User’s Manual 115 116 Schematics