Black Box IC026AE-R2 Rsv, Not Defined-Always, Serial Input Buffer not Empty, Serial Handshake

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CHAPTER 5: Peripheral Operation

DIO7	rsv
serial-poll status information
	This bit is defined by the IEEE 488 Specification and is used
	to indicate to the bus controller that the interface converter is
	the bus device that requested service. It is cleared when the
	interface is serial polled by the controller.
DIO6	Not Defined—Always “0”
DIO5	Serial Input Buffer NOT EMPTY
	This bit is set when the serial input buffer contains one or
	more data bytes which have not been sent out the IEEE bus.
	It is cleared, set to “0,” when the buffer is empty.
DIO4	IEEE Input Buffer Full
	When this bit is set, it indicates that the interface converter
	may hold off the controller on subsequent data transfers. The
	interface may continue to accept an additional 512 characters,
	depending on the size of the serial input buffer.
DIO3	Received Last Serial Terminator
	If the Peripheral SRQ feature is enabled, the interface
	converter will issue a request for service by asserting the SRQ
	line and setting this bit along with the rsv bit (DIO7). It is
	cleared, along with rsv, when serial polled by the controller.
	If this feature is not enabled, this bit is always “0.”
DIO2	Serial Handshake
	This bit indicates the present state of the serial handshake.
	If it is set to “1,” the serial device connected to the interface
	converter is capable of accepting serial data. If “0,” the RTS
	line is unasserted, if configured for hardware handshake, or
	the “X-OFF” character has been received, if configured for
	X-ON/X-OFF software handshake.
DIO1	Not Used—Always “0”

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Contents RS-232↔IEEE Interface Converter RS-232↔IEEE 488 Interface Converter Trademarks Used in this Manual RS-232↔IEEE 488 Interface Converter NOM Statement RS-232↔IEEE 488 Interface Converter Contents RS-232↔IEEE 488 Interface Converter Contents IEEE-488 Interface SpecificationsSerial Interface General SpecificationsDescription IntroductionAbbreviations Getting Started ConfigurationInspection Serial PortSW3 Serial Port Settings Switch SW1 Selecting the Serial Baud Rate Switch SW1 Selecting the Serial Word Length Data Bits Switch SW2 Selecting the Serial Parity Switch SW1 Selecting the Serial Handshake Selecting Terminator Substitution Switch SW2 Selecting the Serial TerminatorSwitch SW3 Selecting the Ieee Bus Terminator Selecting the ModeSelecting the Ieee Address 10. Switch SW2 Selecting the ModeFeature Selections Serial Interface 15. Selecting RS-232 or RS-422 Signal Levels TxD Transmit Data-Output-Pin RxD Receive Data-Input-PinClear To Send-Input-Pin Request To Send-Output-PinGnd Ground-Pin Vtest Test Voltage-Output-Pin+RxD Receive Data Plus-Input-Pin +TxD Transmit Data Plus-Output-PinRTS CTS DSR RTS CTS GeneralGetting Started Controller-Mode Serial to Ieee Operation Controller OperationSerial and Ieee Terminator Substitution Ieee Address Selection Talk-Back FeaturesSwitch SW1 Enabling or Disabling Talk-Back on Terminator Switch SW2 Enabling or Disabling Talk-Back on Timeout SP1PA1000,1000PDPA1000,6000PUSP0 7470APlotter Applications A PC-Based Graphics System SW3 MacPlot Configuration Screen Setting the Internal DIP Shorting Jumper for RS-422 SW3 Printer Applications Peripheral-Mode Operation Peripheral OperationSerial and Ieee Input Buffers Ieee Data Transfers Controlled BUS Data Transfers DIO8 Ieee Input Buffer not Empty Serial-Poll Status-Byte RegisterNot Defined-Always RsvSerial Input Buffer not Empty Ieee Input Buffer FullIeee 488 Bus Implementation Use of Serial and Bus TerminatorsUntalk UNT SW3 View for Ieee Address Selection History Ieee 488 PrimerGeneral Structure RS-232↔IEEE 488 Interface Converter DMM Send It to My AddressBus Management Lines Data Valid DAV Handshake LinesData Lines Multiline CommandsTalk Address Group TAG More on Service Requests Serial Poll Address Device Part Number Function Theory of OperationComponent Layout of the Interface Converter’s Motherboard Board LayoutRED BLK CLS Appendix A. Sample Dumb-Terminal ProgramSOH Multiline MessagesAscii Character How To Read the ChartDIO1 DIO2 DIO3 IndexIndex SW1 Copyright 1998. Black Box Corporation. All rights reserved