National Instruments GPIB-140B Manuale utente
USER MANUAL
GPIB-140B
Fiber Optic GPIB Extender
This document provides installation, configuration, and reference information for the
GPIB-140B fiber optic GPIB extender.
Contents
Basic Information......................................................................................................................2
Unpacking......................................................................................................................... 3
Hardware Symbol Definitions.......................................................................................... 3
Hardware Overview.................................................................................................................. 4
GPIB-140B Description....................................................................................................4
GPIB-140B Dimensions................................................................................................... 5
Grounding the GPIB-140B .............................................................................................. 6
LED Indicators..................................................................................................................8
DIP Switches.....................................................................................................................8
Hardware Connections..............................................................................................................9
Connecting the Cables...................................................................................................... 9
Connecting the External Power Supply.......................................................................... 10
Verifying the Connection................................................................................................ 10
Hardware Configuration..........................................................................................................11
Data Transfer Modes....................................................................................................... 11
HS488 Mode................................................................................................................... 12
Parallel Poll Response Modes.........................................................................................13
Theory of Operation................................................................................................................15
GPIB Basics.................................................................................................................... 16
Introduction to HS488.....................................................................................................21
Multiline Interface Messages.......................................................................................... 25
Product Certifications and Declarations................................................................................. 29
NI Services..............................................................................................................................29
Basic Information
This section provides general information about the GPIB-140B.
Conventions
GPIB-140B Refers to a GPIB extender that extends the GPIB to a maximum
distance of 1 km.
GPIB extender Refers to the bus extender.
IEEE 488 and IEEE
488.2
Refers to the ANSI/IEEE Standard 488.1-1987 and the ANSI/
IEEE Standard 488.2-1992, respectively, which define the GPIB.
Kit Contents
• A GPIB-140B bus extender
• 12 V DC power supply
This power adapter can be used with an input AC voltage between 100 V AC and
240 V AC. Verify that the voltage you will be using is in the input range of this power
adapter.
Note If using a different adapter than what ships with the GPIB-140B, ensure
that the adapter provides 9 V DC to 15 V DC and has appropriate safety
certification marks for country of use.
Optional Equipment
The following table lists some cables available for the GPIB-140B. For a complete list of
GPIB accessories and ordering information, refer to the pricing section of the Fiber-Optic
Cable and GPIB Cable product pages at ni.com.
Note The GPIB-140B is designed for use with multi-mode fiber-optic cable. Do
not use with single-mode cable.
Table 1. GPIB-140B Optional Cables
Cable/Accessory Part Number
GPIB T7 fiber-optic cable - extends up to 1 km
(10 m to 1000 m lengths)
182805-010/020/030/050/100/200/500/01K
Type X2 double-shielded cable with shielded
plug/receptacles
0.5 m: 763061-005 3 m: 763061-003
1 m: 763061-01 4 m: 763061-04
2 m: 763061-02
2| ni.com | GPIB-140B User Manual
Note To meet FCC emission limits for this device, use only with shielded cables
and accessories. If you operate this equipment with a non-shielded cable, it may
interfere with radio and television reception.
Related Documentation
The following documents contain information that you may find helpful as you read this
manual:
• GPIB 140B Specifications
• GPIB-140B Safety, Environmental, and Regulatory Information
• 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
Unpacking
The GPIB-140B ships in an antistatic package to prevent electrostatic discharge (ESD). ESD
can damage several components on the device.
To avoid ESD damage in handling the device, take the following precautions:
• Ground yourself with a grounding strap or by touching a grounded object.
• Touch the antistatic package to a metal part of your computer chassis before removing the
device from the package.
Remove the device from the package and inspect it for loose components or any other signs of
damage. Notify NI if the device appears damaged in any way. Do not install a damaged
device.
Store the device in the antistatic package when the device is not in use.
Hardware Symbol Definitions
The following symbols are marked on the GPIB-140B.
Caution Take precautions to avoid injury. Refer to the GPIB-140B Safety,
Environmental, and Regulatory Information for safety guidelines.
At the end of the product life cycle, all NI products must be disposed of
according to local laws and regulations. For more information about how to
recycle NI products in your region, visit ni.com/environment/weee.
540
e
NI 符合中国电子信息产品中限制使用某些有害物质指令(RoHS)。关于 NI
中国 RoHS 合规性信息，请登录 ni.com/environment/rohs_china。
(For information about China RoHS compliance, go to ni.com/
environment/rohs_china.)
GPIB-140B User Manual | © National Instruments Corporation | 3
Hardware Overview
This section describes the GPIB-140B fiber optic GPIB extender.
GPIB-140B Description
Note The GPIB-140B bus extender can communicate with either a GPIB-140B or
a GPIB-140A bus extender. The GPIB-140B cannot communicate with a GPIB-140,
a GPIB-140/2 or a GPIB-140A/2 bus extender since it uses a different protocol to
communicate across the fiber-optic cable.
The GPIB-140B is a high-speed bus extender that you can use in pairs with multi-mode fiber-
optic cable to connect two separate GPIB systems in a functionally transparent manner.
The two bus systems are physically separate, as shown in the following figure.
Figure 1. Typical Extension System (Physical Configuration)
Printer
(Listener)
GPIB Cable
Computer
(System Controller,
Talker, and Listener)
GPIB Cable
Multi-Mode
Fiber-Optic Cable
Signal Generator
(Listener) Unit Under Test
Multimeter
(Talker and Listener)
GPIB-140BGPIB-140B
GPIB Cable
The devices logically appear to be located on the same bus, as shown in the following figure.
Figure 2. Typical Extension System (Logical Configuration)
Computer
(System Controller,
Talker, and Listener)
Printer
(Listener)
GPIB
Multimeter
(Talker and Listener)
Signal Generator
(Listener)
Unit Under Test
4| ni.com | GPIB-140B User Manual
The bus extender complies with the specifications of the ANSI/IEEE Standard 488.1-1987 and
the ANSI/IEEE Standard 488.2-1992, including the Find Listeners protocol. With the GPIB
extenders, you can overcome the following two configuration restrictions imposed by IEEE
488:
• A cable length limit of 20 m total per contiguous bus or 2 m per each device on the bus,
whichever is smaller.
• An electrical loading limit of 15 devices per contiguous bus.
Each GPIB-140B system extends the GPIB to a maximum distance of 1 km, and extends the
loading limit to 28 devices (including the GPIB extenders), without sacrificing speed or
performance. You can connect these point-to-point extension systems in series for longer
distances or in star patterns for additional loading.
Using the HS488 protocol, the maximum data transfer rate over the extension is greater than
2.8 MBytes/s. The GPIB extenders use a buffered transfer technique with a serial extension
bus, which maximizes performance and minimizes the cabling cost. Furthermore, the extender
does not affect the transfer rate between devices on the same side of the extension. The GPIB
extender can also check for errors to make sure that the data transmitted successfully over the
fiber-optic link.
Because the GPIB-140B is a functionally transparent extender, the GPIB communications and
control programs that work with an unextended system also work with an extended system.
However, the Parallel Poll Response Modes section describes one exception to this
transparency in conducting parallel polls.
GPIB-140B Dimensions
The following dimensional drawings apply to the GPIB-140B. To find detailed dimensional
drawings and 3D models visit ni.com/dimensions and search for the device number.
GPIB-140B User Manual | © National Instruments Corporation | 5
Figure 3. GPIB-140B Top and Bottom Dimensions
93.67 mm
(3.688 in.)
133.88 mm (5.271 in.)
50.00 mm
(1.969 in.)
Figure 4. GPIB-140B Side Dimensions
POWER
OFF ON
LINK STATUS PARALLEL POLL IMMEDIATE
GPIB-140B
FIBER OPTIC GPIB EXTENDER
HS488 ENABLED
BUFFERED TRANSFER
ON
OFF
28.80 mm
(1.134 in.)
RECEIVE TRANSMIT
INPUT - - - +
9 to 15 V - - - 3 W MAX
Grounding the GPIB-140B
You must connect the GPIB-140B grounding terminal to the grounding electrode system of the
facility.
Note For more information about ground connections, visit ni.com/r/emcground.
6| ni.com | GPIB-140B User Manual
What to Use
• Standard ring lug
• Wire, 1.3 mm2 (16 AWG) or larger
• Screwdriver, Phillips #2
What to Do
Complete the following steps to ground the GPIB-140B.
Figure 5. Installing the Ground Wire
POWER
OFF ON
LINK STATUS PARALLEL POLL IMMEDIATE
GPIB-140B
FIBER OPTIC GPIB EXTENDER
HS488 ENABLED
BUFFERED TRANSFER
ON
OFF
1. Attach the ring lug to the wire.
2. Remove the grounding screw from the grounding terminal on the side panel of the
product.
3. Fasten the ring lug to the grounding terminal.
4. Tighten the grounding screw to 1.3 N · m (11.5 in-lb) of torque.
5. Attach the other end of the wire to the chassis safety ground using a method that is
appropriate for your application.
GPIB-140B User Manual | © National Instruments Corporation | 7
LED Indicators
Table 2. LED State/Device Status
LED Color Behavior Description
POWER
Green Solid GPIB-140B is powered on.
Red Solid GPIB-140B is powered on, but the input supply voltage
is either out of the operating range or the overcurrent
protection is active.
— Off The supply voltage is connected in reverse polarity
(when the device is powered on), or the device is
powered off.
LINK
Green Solid Both GPIB extenders are powered on and the fiber-optic
transmission cable is properly connected between them.
The GPIB-140B bus extenders are ready to use.
— Off The fiber-optic cable is defective or disconnected, or the
remote GPIB-140B is turned off.
STATUS
Green Flashing, 10 Hz Activity is present on the GPIB bus.
Red Solid The fiber-optic cable is either defective or disconnected,
or the GPIB-140B is turned off.
Red Flashing, 10 Hz The GPIB-140B is receiving corrupted data, and starts
re-transmission.
The red LED turns off after 50 ms and flashes green
when the extender receives retransmitted data bytes
without error.
— Off There is no activity on the GPIB bus.
DIP Switches
The 3-bit DIP switch sets the operation mode of the GPIB extender. The default switch setting
is for unbuffered transfer mode, latched parallel poll response (PPR), and HS488 disabled
mode, as shown here.
8| ni.com | GPIB-140B User Manual
Figure 6. Default DIP Switch Setting
OFF
PARALLEL POLL IMMEDIATE
HS488 ENABLED
BUFFERED TRANSFER
Verify that the DIP switches on your GPIB extender are in these default positions. If you need
to change these settings, refer to Hardware Configuration on page 11 for instructions about
how to set the operation mode for your application.
Hardware Connections
This section explains how to connect the GPIB-140B to the fiber-optic cables and power
supply, and how to run a self test to verify operation.
Connecting the Cables
Note The GPIB-140B is designed for use with multi-mode fiber-optic cable. Do
not use with single-mode cable.
Complete the following steps to connect a multi-mode fiber-optic cable to both GPIB
extenders.
1. Make sure that each GPIB-140B extender is powered off.
2. Connect the two connectors on each end of the fiber-optic cable to your GPIB extenders,
as follows:
a. As shown in the following figure, align the connector marked T (transmit) with the
connector labeled TRANSMIT on the side of the GPIB extender. Align the
connector marked R (receive) with the connector labeled RECEIVE on the side of
the GPIB extender.
Figure 7. Connecting the Fiber-Optic Cable to Both GPIB Extenders
GPIB-140BGPIB-140B
Multi-Mode
Fiber-Optic Cable
Transmit
Transmit
Receive
Receive
b. Remove the caps on the connectors.
GPIB-140B User Manual | © National Instruments Corporation | 9
c. Align the notch on each cable connector to the slot of the fiber-optic connector on
the GPIB extender.
d. Firmly push in the cable connector and rotate the sleeve clockwise until it locks on
to the side notch of the fiber-optic connector on the GPIB extender.
3. Connect the end of the extender with the GPIB connector to your GPIB system. Make
sure to follow all IEEE 488 cabling restrictions. For typical restrictions, refer to
Configuration Requirements on page 20.
Connecting the External Power Supply
Complete the following steps to connect the external power supply.
1. Plug the utility power cord of your 12 V DC power supply into a 100 V AC to 240 V AC
electrical outlet.
2. Plug the other end of the power cord into the power supply.
3. Connect the 12 V DC output of the power supply into the DC power connector on the
GPIB-140B by rotating the sleeve by hand until it is firmly screwed in place.
4. Power on the GPIB-140B extender; the POWER LED lights green. If the LED does not
light green make sure that the supply voltage is in the acceptable range.
The LINK LED lights green when multiple GPIB extenders are properly connected and turned
on.
Note Refer to LED Indicators on page 8 for detailed information about the
behavior of each LED.
Verifying the Connection
Each GPIB extender has a self test that determines whether the GPIB extender receivers,
transmitters, and packet transmission and reception circuitry are working properly.
Complete the following steps to run the self-test.
1. Power off the GPIB extender.
2. Disconnect the fiber-optic cable from the GPIB extender.
3. Power on the GPIB extender.
The POWER LED lights green, indicating that power is supplied to the extender. The
LINK LED remains off, and the STATUS LED lights red.
4. Connect the connector marked T (transmit) on one end of the fiber-optic cable to the
connector marked TRANSMIT on the side of the GPIB extender.
5. Connect the connector marked R (receive) on the opposite end of the fiber-optic cable to
the connector marked RECEIVE on the side of the GPIB extender.
10 | ni.com | GPIB-140B User Manual
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