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National Instruments Corporation

B-1

GPIB-232CV-A User Manual

B

Interfacing to a Serial Device

This appendix describes the RS-232 serial port on the GPIB-232CV-A and
explains how to interface a DCE or DTE serial device to the RS-232 serial
port.

The GPIB-232CV-A transfers serial data using the electrical signals,
mechanical connections, data format, and control protocols defined in
the RS-232C standard. The RS-232 port on the GPIB-232CV-A is an
asynchronous serial communication link to a serial peripheral device.

RS-232C Standard

The RS-232C standard (international standard CCITT V.24) was
formulated in 1969 largely from the efforts of the Electronic Industries
Association (EIA) and Bell Laboratories. The standard describes the
electrical specifications and arrangement of control and data signals on
both sides of a serial communications interface. Its original intent was to
interface terminals to modems. Many manufacturers of computers and
instruments have adopted the standard for their serial communications
needs. For more information on the RS-232C standard, contact

Global Engineering Documents
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Summary of Contents for GPIB-232CV-A

Page 1: ...GPIB GPIB 232CV A User Manual IEEE 488 RS 232 Converter GPIB 232CV A User Manual November 1999 Edition Part Number 370905A 01 ...

Page 2: ...14 24 24 Germany 089 741 31 30 Greece 30 1 42 96 427 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 Norway 32 27 73 00 Poland 48 22 528 94 06 Portugal 351 1 726 9011 Singapore 2265886 Spain 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2377 ...

Page 3: ...tions or service failures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control Copyright Under the copyright laws this publication may not be reproduc...

Page 4: ... interference to radio and television reception Classification requirements are the same for the Federal Communications Commission FCC and the Canadian Department of Communications DOC Changes or modifications not expressly approved by National Instruments could void the user s authority to operate the equipment under the FCC Rules Class A Federal Communications Commission This equipment has been ...

Page 5: ...ns Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada European Union Compliance to EEC Directives Readers in the EU EEC EEA must refer to the Manufacturer s Declaration of Conformity DoC for information pertaining to the CE Mark compliance scheme The Manufacturer includes a DoC for most every hardware product except for those bough...

Page 6: ... 2 Configure and Install Your Hardware Configure Your Hardware 2 1 Configure the GPIB 232CV A Parameters 2 2 Configure the Serial Port Parameters 2 5 Install Your Hardware 2 6 Step 1 Shut Down Your System 2 6 Step 2 Verify That You Have a Null Modem Serial Cable 2 7 Step 3 Connect the Cables 2 7 Step 4 Power on Your System and Switch on Your GPIB 232CV A 2 8 Chapter 3 Operation of the GPIB 232CV A...

Page 7: ...e 3 9 No Swap Mode 3 10 Data Buffering and Handshaking Schemes 3 11 Hardware Handshaking 3 11 XON XOFF Software Handshaking 3 12 Appendix A Specifications Appendix B Interfacing to a Serial Device Appendix C Application Examples Appendix D Technical Support Resources Glossary Index Figures Figure 1 1 GPIB 232CV A AC Front Panel 1 3 Figure 1 2 GPIB 232CV A Top Panel 1 4 Figure 1 3 GPIB 232CV A Rear...

Page 8: ... DCE B 5 Figure B 6 Cable Configuration for 9 pin DTE to 9 pin DTE with Handshaking B 7 Figure B 7 Cable Configuration for 9 pin DTE to 25 pin DTE with Handshaking B 7 Figure B 8 Minimum Configuration for 9 pin DTE to 9 pin DTE B 8 Figure B 9 Minimum Configuration for 9 pin DTE to 25 pin DTE B 8 Figure C 1 Example of Print Spooler Setup C 2 Tables Table 1 1 LED Descriptions 1 4 Table 2 1 Configura...

Page 9: ...s Bold text also denotes parameter names IEEE 488 and IEEE 488 and IEEE 488 2 refer to the ANSI IEEE Standard 488 1 1987 IEEE 488 2 and the ANSI IEEE Standard 488 2 1992 respectively which define the GPIB italic Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that you must supply mono...

Page 10: ...pful as you read this manual ANSI EIA 232 C Interface Between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange ANSI IEEE Standard 488 1 1987 IEEE Standard Digital Interface for Programmable Instrumentation ANSI IEEE Standard 488 2 1992 IEEE Standard Codes Formats Protocols and Common Commands ...

Page 11: ... access DMA controller for high speed data transfers from the GPIB circuitry The GPIB 232CV A also increases the efficiency of the interface system by using a 256 KB RAM buffer to isolate the slower device from the faster port You can use the GPIB 232CV A to interface either a GPIB Controller or a GPIB device to a computer or instrument with a RS 232 port The RS 232 serial port is fully compatible...

Page 12: ...uropean power cord North American power cord U K power cord If you have the GPIB 232CV A DC version one of the following 9 V wall mount power supply 100 120 VAC 9 V wall mount power supply 220 240 VAC Type XI or X2 single shielded or double shielded GPIB cable 1 2 or 4 m which you can purchase from National Instruments Caution To meet FCC emission limits for this device you must use a Type X2 doub...

Page 13: ...o be damaged do not attempt to operate it Contact National Instruments for instructions If the damage appears to have been caused in shipment file a claim with the carrier GPIB 232CV A Panels The following sections describe the panels of the GPIB 232CV A AC Front Panel The power switch fuse holder and power cord receptacle are located on the GPIB 232CV A front panel on the AC version only Figure 1...

Page 14: ...s each LED Table 1 1 LED Descriptions LED Indication POWER Indicates that power has been applied to the unit and the ON OFF switch is in the ON position READY Indicates that the power on self test has successfully passed and the unit is ready to operate TALK Indicates that the GPIB 232CV A is configured as a GPIB Talker LISTEN Indicates that the GPIB 232CV A is configured as a GPIB Listener T A L ...

Page 15: ... 1 3 GPIB 232CV A Rear Panel BUSY Indicates that the GPIB 232CV A is currently accepting serial data Each serial character received toggles the status of the BUSY LED FULL Indicates that one of the GPIB 232CV A data buffers is full This is not an error condition but is merely a signal that bus performance may be reduced to the speed of the slower port Table 1 1 LED Descriptions Continued LED Indic...

Page 16: ...sion the DC power jack is on the same end as the serial connector Figure 1 4 shows the location of the RS 232 and GPIB connectors and the DC power jack Figure 1 4 Location of the Connectors and the DC Power Jack P O W E R R E A D Y T A L K L I S T E N IEEE 488 Controller RS 232 RS 232 Connector GPIB Connector DC Power Jack DC version only B U S Y F U L L GPIB 232CV A ...

Page 17: ...ature male connector with screwlock assemblies The RS 232 connector accepts standard 9 pin D Subminiature female connectors Figure 1 5 shows a diagram of the serial connector and the signals supported For more information on the RS 232 signals refer to Appendix B Interfacing to a Serial Device Figure 1 5 RS 232 Connector and Signal Designations No Connection RTS CTS No Connection No Connection RXD...

Page 18: ...the signals supported A suffix indicates that the signal is active low Figure 1 6 GPIB Connector and Signal Designations DIO1 DIO2 DIO3 DIO4 EOI DAV NRFD NDAC IFC SRQ ATN SHIELD 1 2 3 4 5 6 7 8 9 10 11 12 DIO5 DIO6 DIO7 DIO8 REN GND Twisted Pair with DAV GND Twisted Pair with NRFD GND Twisted Pair with NDAC GND Twisted Pair with IFC GND Twisted Pair with SRQ GND Twisted Pair with ATN SIGNAL GROUND...

Page 19: ... AC version must be the proper type and size For fuse specifications refer to Appendix A Specifications Your GPIB 232CV A is configured at the factory as follows D mode GPIB primary address 5 SRQ feature disabled Serial port is configured to 9600 baud 1 stop bit per character Parity generation checking disabled 7 data bits per character XON XOFF protocol disabled If you want to change any of the G...

Page 20: ...2 1 switches 1 through 5 are ON OFF ON OFF and OFF respectively indicating a GPIB primary address of 5 Switches 6 and 7 are in the OFF position indicating that SRQ is disabled and the small serial buffer is used Switch 8 is in the OFF position indicating that the unit is configured to operate in D mode Tables 2 1 2 2 and 2 3 show the possible configurations of SW1 and what the configurations indic...

Page 21: ...B Primary Address 14 ON ON ON ON OFF GPIB Primary Address 15 OFF OFF OFF OFF ON GPIB Primary Address 16 ON OFF OFF OFF ON GPIB Primary Address 17 OFF ON OFF OFF ON GPIB Primary Address 18 ON ON OFF OFF ON GPIB Primary Address 19 OFF OFF ON OFF ON GPIB Primary Address 20 ON OFF ON OFF ON GPIB Primary Address 21 OFF ON ON OFF ON GPIB Primary Address 22 ON ON ON OFF ON GPIB Primary Address 23 OFF OFF...

Page 22: ...ication 6 7 D Mode C Mode OFF OFF SRQ Disabled and Small Serial Buffer Timeout Termination ON OFF SRQ Enabled and Small Serial Buffer CR Termination OFF ON SRQ Disabled and Large Serial Buffer LF Termination ON ON SRQ Enabled and Large Serial Buffer No Swapping Table 2 3 Configuration Parameters for SW1 Switch 8 Switch 8 Position Indication OFF GPIB 232CV A Operates in D Mode ON GPIB 232CV A Opera...

Page 23: ...al port is operating at 9600 baud Switches 4 and 5 are both OFF which indicates that parity is disabled Switch 6 is OFF which indicates 1 stop bit per character Switch 7 is OFF indicating that the GPIB 232CV A is using 7 bits character for its serial data transfers Switch 8 is OFF indicating that XON XOFF software handshaking is disabled Tables 2 4 and 2 5 show the possible configurations of SW2 a...

Page 24: ... computer and unplug the power cord OFF ON ON 19200 baud ON ON ON 38400 baud Table 2 5 Configuration Parameters for SW2 Switches 4 through 8 Switch Position Indication 4 OFF Odd parity ON Even parity 5 OFF Parity generation checking disabled ON Parity generation checking enabled 6 OFF 1 stop bit per character ON 2 stop bits per character 7 OFF 7 bits per character ON 8 bits per character 8 OFF XON...

Page 25: ...e sure to use only shielded serial cables and follow all RS 232 cabling restrictions 2 Connect the GPIB cable to the GPIB 232CV A 24 pin Champ connector and tighten the thumb screws on the connector Connect the other end to your GPIB system Be sure to use only shielded GPIB cables and follow all IEEE 488 cabling restrictions 3 If you have an AC version connect the power cord to the power receptacl...

Page 26: ...f you have a DC version use the power switch on the rear panel to power on your GPIB 232CV A The POWER LED indicator should come on immediately The READY LED indicator should come on after the GPIB 232CV A has passed its power on self test indicating the unit is ready for operation If the READY LED does not come on within seven seconds after the unit is powered on recheck all connections and switc...

Page 27: ...r the Carriage Return character hex 0D LF is the symbol for the Linefeed character hex 0A Choosing Between D Mode and C Mode Configuration The GPIB 232CV A can be configured either as a GPIB device that is addressed to talk or listen by a GPIB Controller on the bus D mode or as a GPIB Controller that addresses a single GPIB device to talk or listen C mode When to Use D Mode The GPIB 232CV A should...

Page 28: ...ler capabilities and a serial device An example of a system requiring C mode includes a GPIB device such as a digital multimeter connected to an IBM PC serial port through a GPIB 232CV A as shown in Figure 3 2 Figure 3 2 Example of C Mode System Setup P O W E R R E A D Y TA LK LI S TE N B U S Y FU LL GPIB 232CV A FUSE IBM PC AT GPIB Controller GPIB Device Serial Cable GPIB Cables GPIB 232CV A Prin...

Page 29: ... CIC If the GPIB 232CV A receives the universal Device Clear DCL command or is addressed to listen and receives the Selected Device Clear SDC command it clears its internal data buffers and resets to its power up state Neither Trigger GET nor Go To Local GTL have any effect on the GPIB 232CV A Data Transfers in D Mode When you are ready to send data to the GPIB 232CV A in D mode address the GPIB 2...

Page 30: ...ding thousands of bytes of measurements In either case the remainder of RAM space is used as the GPIB input buffer Thus if a large amount of GPIB data is expected to be sent to the GPIB 232CV A it would be advantageous to use the small 256 byte serial port buffer size if possible Then the majority of RAM is used as the GPIB buffer The larger serial buffer size is a means of capturing a larger perc...

Page 31: ... it requests service indicating it is ready for more data The Controller can then readdress the GPIB 232CV A to listen and continue sending data until all the data is sent Maximizing Performance with SRQ If large amounts of data greater than the GPIB buffer size are sent over the GPIB to the GPIB 232CV A and the serial device is a very slow data acceptor the GPIB 232CV A internal GPIB data buffer ...

Page 32: ...en Only Mode In listen only mode no addressing is required to make the GPIB 232CV A a GPIB Listener and it cannot be unaddressed to listen All data transferred on the GPIB is accepted by the GPIB 232CV A and output to the serial port even if the data was intended for another device This configuration can be used to monitor all GPIB data bus activity Notice that when the GPIB 232CV A is configured ...

Page 33: ...itches 1 through 5 are all ON no addressing is performed This configuration is useful if you are talking to a listen only device that does not require addressing The GPIB 232CV A always asserts REN when addressing other devices Data Transfers in C Mode All incoming serial data to the GPIB 232CV A is stored in an internal data buffer until it is accepted by the GPIB device All GPIB data sent to the...

Page 34: ...e sent from the device to the GPIB 232CV A You can select these modes using SW1 switches 6 and 7 Timeout Termination Mode Timeout termination mode should be used for applications in which bidirectional communication is required and neither a CR nor LF character is used to signal the end of a command string to the GPIB device To select timeout termination mode set SW1 switches 6 and 7 to OFF Figure...

Page 35: ... instrument can be terminated with either a CR carriage return or LF linefeed character you can use either termination with CR or LF to readdress the GPIB device to send data To select CR mode set SW1 switch 6 to ON and 7 to OFF To select LF mode set SW1 switch 6 to OFF and 7 to ON In these modes when the GPIB 232CV A receives the terminating character from the serial port it addresses the device ...

Page 36: ... listen and then sends these characters to it Notice that for this PRINT statement a semicolon is included after the last double quotation mark This means a CR is not sent Because no information is requested from the plotter there is no need to send a CR at the end of the string to address the plotter to talk No Swap Mode In no swap mode the GPIB 232CV A never readdresses a GPIB device after it ha...

Page 37: ...ransfers and uses the Request to Send RTS and Clear to Send CTS signal lines When the GPIB 232CV A is ready to accept serial data it asserts the RTS line This signal remains asserted until the data buffer of the GPIB 232CV A is almost full At this point the GPIB 232CV A unasserts the RTS line signaling to the serial host that the GPIB 232CV A is no longer ready to accept data The serial host shoul...

Page 38: ...s so by sending special control codes over the data lines instead of changing logic levels on dedicated control lines When you enable the XON XOFF protocol the GPIB 232CV A sends the XOFF character decimal 19 or Ctrl S before the internal buffer overflows When the GPIB 232CV A is able to start receiving characters again it sends the XON character decimal 17 or Ctrl Q Similarly if the GPIB 232CV A ...

Page 39: ...0 60 Hz 220 240 VAC 10 50 60 Hz Current requirement 100 120 VAC 55 mA 220 240 VAC 45 mA Fuse rating and type 100 120 VAC 300 mA UL CSA approved 220 240 VAC 500 mA IEC approved DC Version Power supply unit 50 60 Hz input 9 VDC at 1 A output Wall mount type 100 120 VAC 10 Desktop type 220 240 VAC 10 DC input 5 to 13 regulated Current 700 mA minimum Environmental Characteristics AC Version Operating ...

Page 40: ...o 40 C Storage temperature 0 to 70 C Relative humidity 10 to 95 noncondensing EMI FCC Class B Certified Physical Characteristics AC Version Case size 118 1 by 76 2 by 44 2 mm 4 65 by 3 0 by 1 74 in Case material All metal enclosure Weight 340 g 12 oz DC Version Case size 118 1 by 76 2 by 28 2 mm 4 65 by 3 0 by 1 11 in Case material All metal enclosure Weight 198 g 7 oz ...

Page 41: ...nk to a serial peripheral device RS 232C Standard The RS 232C standard international standard CCITT V 24 was formulated in 1969 largely from the efforts of the Electronic Industries Association EIA and Bell Laboratories The standard describes the electrical specifications and arrangement of control and data signals on both sides of a serial communications interface Its original intent was to inter...

Page 42: ... Description RS 232 Code Function 2 RXD Receive Data BB This signal carries serial data from the serial device to the GPIB 232CV A 3 TXD Transmit Data BA This signal carries serial data from the GPIB 232CV A to the serial device 4 DTR Data Terminal Ready CD This signal is asserted by the GPIB 232CV A to signal that it has been powered on and is ready to operate 5 GND Ground AB This signal establis...

Page 43: ...CE RXD and so on as shown in Table B 2 Table B 2 Cable Wiring Scheme for GPIB 232CV A DTE to Serial Device DCE GPIB 232CV A Signal to DCE Serial Device Signal Standard DTE to DCE 9 pin 9 pin Standard DTE to DCE 9 pin 25 pin RXD to RXD 1 2 to 2 2 to 3 TXD to TXD 1 3 to 3 3 to 2 DTR to DTR 4 to 4 4 to 20 GND to GND 1 5 to 5 5 to 7 RTS to RTS 7 to 7 7 to 4 CTS to CTS 8 to 8 8 to 5 1 The connections m...

Page 44: ... B 3 Cable Configuration for 9 pin DTE to 25 pin DCE with Handshaking Interfacing the GPIB 232CV A to a DCE without Handshaking If your serial device does not require or use the hardware handshaking protocol used by the GPIB 232CV A you have two options Use a minimum configuration cable which does not support hardware handshaking and use XON XOFF software handshaking if necessary To create a minim...

Page 45: ...mes that the DCE does not require external hardware handshaking The minimum configuration for a DTE 9 pin to DCE 9 pin cable is shown in Figure B 4 Figure B 5 shows an equivalent 9 pin to 25 pin cable Figure B 4 Minimum Configuration for 9 pin DTE to 9 pin DCE Figure B 5 Minimum Configuration for 9 pin DTE to 25 pin DCE 1 5 6 7 8 9 GPIB 232CV A 9 pin DTE 5 1 9 8 7 6 Serial Device 9 pin DCE 1 5 6 7...

Page 46: ...best to use some form of handshaking to prevent loss of data Interfacing the GPIB 232CV A to a DTE with Handshaking For serial devices set up as DTEs you must wire a DTE to DTE interface cable commonly known as a null modem cable The cable allows the GPIB 232CV A to act as though it is communicating with a DCE but it swaps the appropriate pins to achieve a DTE pinout This wiring configuration is s...

Page 47: ...DTE with Handshaking Interfacing the GPIB 232CV A to a DTE without Handshaking If your serial device does not require or use the same hardware handshaking protocol used by the GPIB 232CV A you have two options Use a minimum configuration null modem cable which does not support the hardware handshake lines and use XON XOFF software handshaking if necessary To create a minimum configuration cable co...

Page 48: ...ial device does not require external hardware handshaking The minimum configuration for a 9 pin to 9 pin null modem cable is shown in Figure B 8 Figure B 9 shows an equivalent 9 pin to 25 pin cable Figure B 8 Minimum Configuration for 9 pin DTE to 9 pin DTE Figure B 9 Minimum Configuration for 9 pin DTE to 25 pin DTE 1 5 6 7 8 9 GPIB 232CV A 9 pin DTE 5 1 9 8 7 6 Serial Device 9 pin DTE Serial Dev...

Page 49: ...ew the RS 232 characteristics of your serial device and build the cable to properly connect the handshake lines of the two devices If the documentation for your serial device does not provide a thorough explanation of its handshaking protocol the ANSI EIA 232 C standard is a good reference provided your device conforms to the RS 232 protocol Caution Although handshaking might not be required it is...

Page 50: ...uffer and can input GPIB data at rates up to 625 kbytes s Therefore the transfer rate is limited only by the rate at which the GPIB Talker can write data This example shows you how to connect and use your GPIB 232CV A as a high speed print spooler which returns control to you quickly so that you do not have to wait for the PC to finish printing or plotting a file The following example is based on ...

Page 51: ...ut to the GPIB device as explained in the NI 488 2 Software Reference Manual for MS DOS but the overhead associated with the DOS calls makes this method inherently slow The fastest way to transfer data to the GPIB port is to write a small program that executes a GPIB file write The following program is an example of how to do a GPIB file write in the C programming language You can use other langua...

Page 52: ...te with a GPIB device By using the GPIB 232CV A you can avoid this situation because the GPIB 232CV A allows communication between the serial port and GPIB devices For example an IBM PC running AUTOCAD sends data to the plotter by transferring data through the computer s serial port It cannot send data to a GPIB plotter such as the HP7475 GPIB plotter Because AUTOCAD supports the HP7475 serial plo...

Page 53: ... plotter Any data sent to the serial port by AUTOCAD is received by the GPIB 232CV A and stored in its internal buffer The GPIB 232CV A transfers the data to the plotter over the GPIB connection as fast as the plotter can receive it Because the GPIB 232CV A provides a data buffer that spools the data as it is sent the PC will be able to send data at serial rates instead of plotter rates Therefore ...

Page 54: ...ns FAQs and their corresponding answers or solutions including special sections devoted to our newest products The database is updated daily in response to new customer experiences and feedback Troubleshooting Wizards Step by step guides lead you through common problems and answer questions about our entire product line Wizards include screen shots that illustrate the steps being described and pro...

Page 55: ...o provide information on local services You can access these Web sites from www ni com worldwide If you have trouble connecting to our Web site please contact your local National Instruments office or the source from which you purchased your National Instruments product s to obtain support For telephone support in the United States dial 512 795 8248 For telephone support outside the United States ...

Page 56: ...nal Standards Institute ASCII American Standards Code for Information Interchange ATN Attention C Celsius CIC Controller In Charge CR carriage return CSA Canadian Standards Association CTS Clear to Send DAV Data Valid DC direct current DCE Data Circuit terminating Equipment DIO digital input output DIP dual inline package DMA direct memory access DTE Data Terminal Equipment DTR Data Terminal Ready...

Page 57: ...rface Bus hex hexadecimal Hz hertz IEC International Electrotechnical Commission IEEE Institute of Electrical and Electronic Engineers IFC Interface Clear in inches KB kilobytes of memory LED light emitting diode LF linefeed LSI large scale integration m meters oz ounces PC personal computer RAM random access memory REN Remote Enable ROM read only memory RTS Request to Send RXD Receive Data s seco...

Page 58: ...nal Instruments Corporation G 3 GPIB 232CV A User Manual TXD Transmit Data UART Universal Asynchronous Receiver Transmitter UL Underwriters Laboratories V volts VAC volts alternating current VDC volts direct current ...

Page 59: ... switches on rear panel figure 1 5 operating at incorrect voltage caution 2 1 parameters for SW1 switches CR or LF termination mode 3 9 to 3 10 default settings for SW1 figure 2 2 Listen only mode setting figure 3 6 parameters for SW1 switch 8 table 2 4 parameters for SW1 switches 1 through 5 table 2 2 to 2 4 parameters for SW1 switches 6 and 7 table 2 4 serial port parameters factory default swit...

Page 60: ... 5 9 pin DTE to 25 pin DCE figure B 5 DCL Device Clear command 3 3 diagnostic resources online D 1 documentation conventions used in manual xi related documentation xii DTE Data Terminal Equipment interfacing with handshaking B 6 to B 7 cable configuration for 9 pin DTE to 9 pin DTE figure B 7 cable configuration for 9 pin DTE to 25 pin DTE figure B 7 cable wiring scheme table B 6 interfacing with...

Page 61: ...C serial port example C 3 to C 4 I IFC signal asserted in C mode 3 7 installation 2 6 to 2 8 connecting cables 2 7 powering on system and switching on GPIB 232CV A 2 8 shutting down your system 2 6 verifying null model serial cable 2 7 L LED descriptions table 1 4 to 1 5 LF termination mode C mode configuration 3 9 to 3 10 LISTEN LED table 1 4 Listener D Mode configuration 3 3 Listen only mode pur...

Page 62: ...andshaking B 4 to B 6 to DTE with handshaking B 6 to B 7 to DTE without handshaking B 7 to B 9 overview 1 7 RS 232C standard for B 1 signal configuration table B 2 signals supported figure 1 7 RTS signal RS 232 port table B 2 RXD signal RS 232 port table B 2 S SDC Selected Device Clear command 3 3 serial cable null modem 2 7 serial poll response of GPIB 232CV A 3 6 serial port See RS 232 serial po...

Page 63: ...tion 3 8 to 3 9 top panel 1 4 to 1 5 illustration 1 4 LED descriptions table 1 4 to 1 5 Trigger GET command 3 3 TXD signal RS 232 port table B 2 W Web support from National Instruments D 1 to D 2 online problem solving and diagnostic resources D 1 software related resources D 2 Worldwide technical support D 2 ...

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