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10

IEEE 488 BUS EXTENDER AND IEEE 488 FIBER BUS EXTENDER

3. Configuration and Installation

3.1 Configuring and Installing the IEEE 488 Bus Extender (IC095A)

This section describes the configuration necessary for the RS-422 IEEE 488 Bus
Extenders. If you are using the fiberoptic extenders (IC096A), refer to

Section 3.2

.

Two IEEE 488 Bus Extenders are required for bus extension, with one connected
directly to the local IEEE bus, and the other connected to the remote IEEE bus.

Both local and remote Extenders are identical. At power-up, each Extender
monitors the Attention (ATN) and Remote Enable (REN) lines. The Error LED
on each Extender will blink, indicating that ATN or REN has not yet been detected
and that communication with the other Extender has not yet been established.
The first Extender to detect either of these lines asserted declares itself the local
Extender and commands the other Extender to declare itself the remote Extender.
The Error LEDs will now stop blinking. From this moment on, the local Extender
will monitor all local bus activity and transmit this activity to the remote Extender.
All activity detected by the remote Extender is also communicated back to the local
Extender.

3.1.1 S

ETTING THE

S

ERIAL

B

AUD

R

ATE

The Extender is shipped with the serial baud rate set to 115.2 Kbps. For most
applications, this is the most efficient operating rate. However, if the Extenders will
be located at extreme distances from each other, baud rates other than 115.2 Kbps
can be selected. Selectable baud rates include 115.2 Kbps, 19.2 Kbps, 9600 bps,
4800 bps, 2400 bps, 1200 bps, 600 bps, and 300 bps. Both Extenders must be set
to the same baud rate for proper operation.

To modify the baud rate, disconnect the power supply from the AC line and
from the interface. Disconnect any IEEE or serial cables prior to disassembly.

WARNING!

Never open the Extender’s case while it is connected to the AC line.
Doing so may result in equipment failure, personal injury, or death.

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Содержание IC095A

Страница 1: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1999 Black Box Corporation All rights reserved ...

Страница 2: ...hours 7 A M Monday to midnight Friday 877 877 BBOX FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com AUGUST 2000 IC095A IC096A IEEE Bus Extender IEEE Fiber Bus Extender ...

Страница 3: ......

Страница 4: ...1 TRADEMARKS TRADEMARKS USED IN THIS MANUAL Any trademarks used in this manual are acknowledged to be the property of the trademark owners ...

Страница 5: ...fabricante 7 El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación Todo otro servicio deberá ser referido a personal de servicio calificado 9 El aparato eléctrico debe ser situado de tal manera que su posición no interfie...

Страница 6: ...r una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación 18 Servicio por personal calificado deberá ser provisto cuando A El cable de poder o ...

Страница 7: ...uration IC096A 12 3 2 1 Overview 12 3 2 2 Installation and Maintainance 13 4 Operation 10 4 1 Powering the System 14 4 2 Parallell Poll Response Time 15 5 IEEE 488 Primer 17 5 1 History 17 5 2 General Structure 17 5 3 Send It to My Address 20 5 4 Bus Management Lines 20 5 5 Handshake Lines 21 5 6 Data Lines 22 5 7 Multiline Commands 22 5 8 More On Service Requests 24 5 8 1 Serial Poll 25 5 8 2 Par...

Страница 8: ...Baud Rate Selectable 300 600 1200 2400 4800 9600 19 200 and 115 200 Data Format Selectable 7 or 8 data bits 1 stop bit odd parity Max Cable Length 3280 feet 1000 meters Data Rates Specifications apply to data transfers after addressing has been established Baud Rate Data Rate bytes per second average 300 13 600 26 1200 53 2400 105 4800 204 9600 385 19 200 691 115 200 3400 Indicators LEDs for IEEE ...

Страница 9: ...rd IEEE 488 connector with metric studs Fiberoptic Interface Wavelength 820 nanometers typical Connectors SMA 905 series female Required Cable Duplex 100 µm 140 µm clad fiber optic 200 MHz km bandwidth 6 dB km max attenuation Max Cable Length 3280 feet 1000 meters Data Rates 3400 bytes per second typical Indicators LEDs for IEEE Talk Listen SRQ Error and Power Temperature 32 to 122 F 0 to 50 C Hum...

Страница 10: ...ler is the local bus The bus to which control is extended is the remote bus An Extender is required on each bus for IEEE bus extension The IEEE 488 Bus Extender IC095A transmits RS 422 data between Extenders RS 422 a differential serial data format provides high noise immunity and long distances using low cost twisted pair wire The IEEE 488 Fiber Bus Extender IC096A communicates serially over dupl...

Страница 11: ... Device Clear GET Group Execute Trigger GTL Go To Local LA Listener Active LAG Listen Address Group LF Line Feed LLO Local Lock Out MLA My Listen Address MTA My Talk Address PE Peripheral PPC Parallel Poll Configure PPU Parallel Poll Unconfigure SC System Controller SDC Selected Device Clear SPD Serial Poll Disable SPE Serial Poll Enable SRQ Service Request TA Talker Active TAD Talker Address TCT ...

Страница 12: ...report any damage found Remember to retain all shipping materials in case shipping the Extender back to the factory becomes necessary Every Extender is shipped with a power supply and this user guide WARNING The Extender requires a regulated external power supply with a maximum output of 5 25 volts Using voltages above this level will result in damage to the interface Only use power supplies provi...

Страница 13: ...the other Extender to declare itself the remote Extender The Error LEDs will now stop blinking From this moment on the local Extender will monitor all local bus activity and transmit this activity to the remote Extender All activity detected by the remote Extender is also communicated back to the local Extender 3 1 1 SETTING THE SERIAL BAUD RATE The Extender is shipped with the serial baud rate se...

Страница 14: ...ot and finish reassembly by re tightening the screws Figure 3 1 Baud Rate Selection 3 1 2 SERIAL DATA FORMAT SELECTION The Extender is configurable for two data formats The first format the factory default is 8 data bits 1 stop bit with odd parity The number of data bits trans mitted can be set to 7 by setting S102 switch 4 to the closed position Even though the seven bit format is chosen binary d...

Страница 15: ... connected to the remote IEEE bus Both local and remote Extenders are identical At power up each Extender monitors the Attention ATN and Remote Enable REN lines The Error LED on each Extender will blink indicating that ATN or REN has not yet been detected and that communication with the other Extender has not yet been established The first Extender to detect either of these lines asserted declares...

Страница 16: ...th 2 Compressed air is often all that s needed to remove dirt particles from the optic transmitters and receivers Standard lens cleaning tissues or cotton swabs soaked with methanol or freon also work well for cleaning cable ferrules Be careful not to splash methanol or freon on case parts 3 When the Extender is not in use replace the Extender s optical transmitter and receiver protection caps Mak...

Страница 17: ...ely one second while the Extender performs an internal ROM and RAM self check At the end of the power on sequence the ERROR LED should continue to blink indicating that commun ication with another Extender has not been established Now repeat the above procedure with the second Extender All LEDs should function the same as with the first Extender If any of the following LED conditions exist after p...

Страница 18: ...e completely transparent to the system with the exception of parallel poll see below Be careful not to have two IEEE devices with the same address connected to either remote or local buses If you do the bus will lock up when one of the devices is accessed 4 2 Parallel Poll Response Times The Parallel Poll function is the only extended bus transaction which is not completely transparent to your sys...

Страница 19: ...TENDER AND IEEE 488 FIBER BUS EXTENDER Table 4 1 Extender Parallel Poll Response Times The minimum time the controller should wait with the IEEE 488 Fiber Bus Extender between consecutive Parallel Polls is 1 millisecond ...

Страница 20: ...ation between two or more devices A device can either be an instrument or a computer Before any information transfer can take place it s first necessary to specify which will do the talking send data and which devices will be allowed to listen receive data The decision of who will talk and who will listen usually falls on the System Controller which is at power on the Active Controller The System ...

Страница 21: ...ge of information can be very slow In fact the rate of information transfer is no faster than the rate at which the slowest note taker can keep up The instructor though may have a message for one particular student The instructor tells the rest of the class to ignore this message Unlisten and tells it to that one student at a rate which he can understand This information transfer can then happen m...

Страница 22: ...19 CHAPTER 5 IEEE 488 Primer Figure 5 1 IEEE 488 Bus Structure ...

Страница 23: ...ress MLA My Talk Address MTA Talk Address Group TAG and Listen Address Group LAG 5 4 Bus Management Lines Five hardware lines on the GPIB are used for bus management Signals on these lines are often referred to as uniline single line commands The signals are active low that is a low voltage represents a logic 1 asserted and a high voltage represents a logic 0 unasserted 5 4 1 ATTENTION ATN ATN is ...

Страница 24: ...r it asserts SRQ It is then the Controller s responsibility to determine which device requested service This is accomplished with a Serial Poll or a Parallel Poll 5 5 Handshake Lines The GPIB uses three handshake lines in an I m ready Here s the data I ve got it sequence This handshake protocol assures reliable data transfer at the rate determined by the slowest Listener One line is controlled by ...

Страница 25: ...n has accepted the information Each device releases NDAC high at its own rate but the NDAC will not go high until the slowest Listener has accepted the data byte Figure 5 2 IEEE Bus Handshaking 5 6 Data Lines The GPIB provides eight data lines for a bit parallel byte serial data transfer These eight data lines use the convention of DIO1 through DIO8 instead of the binary designation of D0 to D7 Th...

Страница 26: ... command tells bus devices to Untalk This is the same as Unaddressed to Talk IEEE 488 command code 5F 5 7 6 LOCAL LOCKOUT LLO Issuing the LLO command prevents manual control of the instrument s functions IEEE 488 command code 11 5 7 7 DEVICE CLEAR DCL This command causes all bus devices to be initialized to a pre defined or power up state IEEE 488 command code 14 5 7 8 SELECTED DEVICE CLEAR SDC Th...

Страница 27: ...ces from responding to a Parallel Poll IEEE 488 command code 15 5 8 More On Service Requests Most of the commands covered both uniline and multiline are the responsibility of the Active Controller to send and the bus devices to recognize Most of these are taken care of routinely by the interface and are totally transparent to the system programmer Other commands are used directly by the user to pr...

Страница 28: ...hy the device wanted service This Serial Polling sequence and any resulting action is under control of the software designer 5 8 2 PARALLEL POLL The Parallel Poll is another way the Controller can determine which device requested service It provides the who but not necessarily the why When bus devices are configured for Parallel Poll they are assigned one bit on the data bus for their response By ...

Страница 29: ...ication to the mating IEEE 488 Bus Extender use a UART U105 through the RS 422 receiver U112 and driver U111 For the IEEE 488 Bus Fiber Extender use the UART and a fiberoptic transmitter U202 and receiver U203 The IEEE 488 bus is monitored by a 9914A IEEE bus device U106 Circuitry surrounding the 9914A U115 and U116 enables the device to monitor all bus activity and to initiate bus activity when r...

Страница 30: ...27 6 2 IEEE 488 Bus Extender Board IC095A CHAPTER 6 Service Information ...

Страница 31: ...28 IEEE 488 BUS EXTENDER AND IEEE 488 FIBER BUS EXTENDER 6 3 IEEE 488 Fiber Bus Extender Board IC096A ...

Страница 32: ...ou have a complete description including the nature and duration of the problem when the problem occurs the components involved in the problem any particular application that when used appears to create the problem or make it worse 6 5 Shipping and Packaging If you need to transport or ship your Extender Package it carefully We recommend that you use the original container If you are shipping the ...

Страница 33: ...racter Codes and IEEE Multiline Messages When reading this table note that the codes listed in the upper left corners are IEEE 488 command codes the codes in the upper right corners are the ASCII representations and the actual message is shown in the center of each block ...

Страница 34: ...NOTES NOTES ...

Страница 35: ...NOTES NOTES NOTES NOTES NOTES ...

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