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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
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Summary of Contents for National Instruments GPIB-140B
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Page 1: Table Of Contents
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 .................... -
Page 2: Basic Information
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. -
Page 3: Unpacking
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: •... -
Page 4: Hardware Overview
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. -
Page 5: Gpib-140B Dimensions
• 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. -
Page 6: Grounding The Gpib-140B
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. - Page 7 Tighten the grounding screw to 1.3 N · m (11.5 in-lb) of torque. 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...
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Page 8: Led Indicators
Green Flashing, 10 Hz Activity is present on the GPIB bus. Solid The fiber-optic cable is either defective or disconnected, or the GPIB-140B is turned off. Flashing, 10 Hz The GPIB-140B is receiving corrupted data, and starts STATUS re-transmission. The red LED turns off after 50 ms and flashes green when the extender receives retransmitted data bytes without error. -
Page 9: Hardware Connections
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. -
Page 10: Connecting The External Power Supply
GPIB-140B by rotating the sleeve by hand until it is firmly screwed in place. 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. -
Page 11: Hardware Configuration
8 for detailed information about the behavior of each LED. Hardware Configuration This section describes how to configure the operation modes supported by the GPIB-140B. Data Transfer Modes The GPIB extender has two data transfer modes—unbuffered mode and buffered mode. The data transfer mode determines how data is transmitted across the extension. -
Page 12: Hs488 Mode
Refer to the following descriptions when selecting the HS488 mode. HS488 Disabled If you disable HS488, the GPIB extender sources and accepts data using a three-wire handshaking protocol, even if both the Talker and Listener can transfer data using the HS488 protocol. 12 | ni.com | GPIB-140B User Manual... -
Page 13: Parallel Poll Response Modes
When selecting a PPR mode, consider the type of Controller present in your GPIB system and the length of cable between the GPIB-140B extenders. However, if your application does not use parallel polls, you do not need to select a PPR mode. - Page 14 To enable immediate PPR mode, set the PARALLEL POLL IMMEDIATE DIP switch to the ON position, as shown in the following figure. To enable latched PPR mode, set this switch to the OFF position. 14 | ni.com | GPIB-140B User Manual...
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Page 15: Theory Of Operation
Layer Parallel-to-Serial Physical Layer Conversion Layer GPIB BUS #1 Transmission Medium GPIB BUS #2 Parallel-to-Serial Physical Layer Conversion Layer Link Management Layer Packet Translation Layer Message Interpreter GPIB EXTENDER Layer GPIB-140B User Manual | © National Instruments Corporation | 15... -
Page 16: Gpib Basics
Controller, usually a computer, and up to 14 additional instruments. The ANSI/IEEE Standard 488.2-1992 extends IEEE 488.1 by defining a bus communication protocol, a common set of data codes and formats, and a generic set of common device commands. 16 | ni.com | GPIB-140B User Manual... - Page 17 The Controller function is usually handled by a computer. With the GPIB interface board and its software your personal computer plays all three roles. • Controller—to manage the GPIB • Talker—to send data • Listener—to receive data GPIB-140B User Manual | © National Instruments Corporation | 17...
- Page 18 ATN (attention) Controller drives ATN true when it sends commands and false when it sends data messages. IFC (interface clear) System Controller drives the IFC line to initialize the bus and make itself CIC. 18 | ni.com | GPIB-140B User Manual...
- Page 19 With this design, you can link devices in a linear configuration, a star configuration, or a combination of the two configurations. The following figure shows both linear and star configurations. GPIB-140B User Manual | © National Instruments Corporation | 19...
- Page 20 There must be at least one equivalent device load per meter of cable. If you want to exceed these limitations, you can use a bus expander to increase the number of device loads. You can order bus expanders from NI. 20 | ni.com | GPIB-140B User Manual...
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Page 21: Introduction To Hs488
HS488 cabling requirements are also the same as the requirements in the IEEE 488.1 standard. However, using HS488 does not reduce software overhead. Also, system throughput increases depend on data block size. GPIB-140B User Manual | © National Instruments Corporation | 21... - Page 22 Talkers and Listeners are capable of HS488 transfers. If the addressed devices are HS488-capable, they use the HS488 noninterlocked handshake protocol for that data transfer. If any addressed device is not HS488-capable, the transfer continues using the standard three-wire handshake. 22 | ni.com | GPIB-140B User Manual...
- Page 23 HSC message false. To send the HSC message false, the Talker unasserts the NRFD signal. When the Talker has a byte ready to send, it drives the data on the DIO signal lines, allows some settling time, and asserts DAV. GPIB-140B User Manual | © National Instruments Corporation | 23...
- Page 24 The Talker does not send an HSC message to the Listener, but sources bytes using the IEEE 488.1 protocol. The addressed Listener (HS488 or IEEE 488.1) accepts bytes using the IEEE 488.1 standard three-wire handshake, as shown in the following figure. 24 | ni.com | GPIB-140B User Manual...
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Page 25: Multiline Interface Messages
For more information about these messages, refer to the ANSI/IEEE Standard 488.1-1987, IEEE Standard Digital Interface for Programmable Instrumentation. Table 5. Multiline Interface Messages ASCII Message ASCII Message — MLA0 MLA1 — " MLA2 GPIB-140B User Manual | © National Instruments Corporation | 25... - Page 26 MLA8 MLA9 — MLA10 — MLA11 — MLA12 — MLA13 — MLA14 — MLA15 — MLA16 MLA17 — MLA18 — MLA19 MLA20 MLA21 — MLA22 — MLA23 MLA24 MLA25 — MLA26 — MLA27 26 | ni.com | GPIB-140B User Manual...
- Page 27 MSA12, PPE, CFG12 MTA13 MSA13, PPE, CFG13 MTA14 MSA14, PPE, CFG14 MTA15 MSA15, PPE, CFG15 MTA16 MSA16, PPD MTA17 MSA17, PPD MTA18 MSA18, PPD MTA19 MSA19, PPD MTA20 MSA20, PPD GPIB-140B User Manual | © National Instruments Corporation | 27...
- Page 28 My Listen Address Take Control My Secondary Address Unlisten My Talk Address Untalk Parallel Poll Configure * This multiline interface message is a proposed extension to the IEEE 488 specification to support the HS488 protocol. 28 | ni.com | GPIB-140B User Manual...
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Page 29: Product Certifications And Declarations
NI product. Product registration facilitates technical support and ensures that you receive important information updates from NI. NI corporate headquarters is located at 11500 N Mopac Expwy, Austin, TX, 78759-3504, USA. GPIB-140B User Manual | © National Instruments Corporation | 29... - Page 30 NI trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering NI products/technology, refer to the appropriate location: Help»Patents in your software, the file on your media, or the National Instruments Patent Notice at . You can find patents.txt ni.com/patents...