GPIB Extenders Specifications on GlobalSpec

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GPIB Protocol Compatibility


	GPIB Protocol Compatibility:
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	IEEE 488.1		Devices are compatible with ANSI/IEEE Standard 488-1975, more commonly known as IEEE 488.1. This standard defines the mechanical, electrical, and protocol specifications for the interconnection of programmable instruments. IEEE 488.1 also specifies that a GPIB network supports a maximum of 14 devices on the bus and a maximum data transfer rate of 1-MBps.
	IEEE 488.2		Devices are compatible with IEEE 488.2, an enhanced version of the original IEEE 488.1 Standard. Because IEEE 488.1 did not specify issues such as how data should be formatted, how the status of the bus should be reported, and how messages should be exchanged, Tektronix proposed a set of standard formats that became the basis of IEEE 488.2. Specifically, IEEE 488.2 standardizes data formats, status reporting, error handling, and controller commands.
	HS488		High Speed 488 (HS488) is a newer, faster protocol developed by National Instruments that accelerates data transfer rates up to 8-MBps using standard GPIB cables. HS488 is a superset of the original IEEE 488.1 standard implemented at the hardware level by an application-specific integrated circuit (ASIC).
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Serial Port Interface

Interface Type:

Your choices are...

RS232

RS232 is a serial, binary-data interface between data terminal equipment (DTE) and data communications equipment (DCE).

RS422

RS422 is a balanced serial interface (greater noise immunity) for the transmission of digital data. It was designed for greater distances and higher baud rates than RS232.

RS485

Like RS422, RS485 is a balanced serial interface for the transmission of digital data. The difference between RS422 and RS485 is that RS485 can be transformed into a multi-point application.

Other

Other unlisted, specialized, or proprietary configurations.

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Maximum Serial Cable Length

The maximum length of the serial cable.

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Maximum Baud Rate

The maximum serial data rate.

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Tables:

Type of Links

A GPIB Extender is a device (normally a standalone module) used to extend the distance at which peripheral devices (instruments, controllers, etc.) may be placed from the host computer. The standards of the IEEE-488 Bus specify a maximum of 20 meters as the limit to locate devices, and a maximum of 14 devices that can be placed in the network. Some of the types of transmission methods that can be used by the extender are:

Serial link via RS232, RS422, of RS485.
Modem (telephone lines) link to extend the bus to a remote location via external modem and direct dial telephone network.
Coaxial cable link for not too long distances, and when electrical isolation is not required.
Fiber optic cable for high-speed, large-distance serial transmission.

Two extenders are needed. One at the local site and one at the remote site. Because each extender represents an IEEE 488 Bus, the maximum number of devices that can be connected to the whole network is 28 instead of 14. Therefore the extender plays the role of an expander as well.

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Modem / Telephone Link


	Serial Cable to Modem		The length of the serial cable (RS232, RS422, etc.) from the extender to the modem.
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	Maximum Baud Rate		The maximum rate (in baud) of the transmission.
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Coaxial Interface


	Maximum Cable Length		The maximum coaxial cable length. Some extenders support both types of cables: coaxial for relatively short distances, and fiber-optic cables for long distances.
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	Coax Data Rate		The maximum data transfer rate.
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	Connector Type:
	Your choices are...
	DB-9 Coax		DB-9 coaxial connectors are 9-pin, D-type devices used for serial communication.
	BNC Coax		Bayonet Neil-Councilman (BNC) connectors for coaxial cables have a center pin connected to the center cable conductor and a metal tube connected to the outer cable shield. These male-type connectors are installed at each end of the cable.
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Fiber Optic Interface


	Maximum Fiber Optic Cable Length		The maximum length of the fiber-optic cable that can be connected to the extender.
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	Fiber Optic Data Rate		The maximum data transfer rate (in Mbps or Gbps) of the fiber-optic interface
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	Bandwidth at 1 km		The cable's capacity or bandwidth. Measured in MHz-km, it specifies the analog bandwidth or the number of bits per second that the fiber can sustain over a 1-km distance. Bandwidth is dependent upon wavelength and type of light source.
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	Fiber Optic Connector Type:		Types of optical cable connectors.
	Your choices are...
	SC		Subscription channel (SC) connectors are coaxial, medium-size devices with a constant 50Ω impedance and a frequency range of 0 - 11 GHz. They are larger than BNC connectors, but about the same size as Type N devices.
	ST		Straight tip (ST) connectors use a quick release, bayonet coupling that requires only a quarter turn to engage or disengage. Built-in keying provides repeatable performance because ST connectors always mate with a coupling bushing in the same way. ST connectors are used in FDDI cabling applications.
	FC		FC connectors have an all-zirconia ceramic ferrule for durability, a high-performance threaded mounting system, and a keyed body for repeatability and intermateability. FC connectors are used primarily with single mode fibers and in telephone, instrumentation, and high-speed communication links.
	D4		D4 connectors contain composite zirconia ceramic ferrules for durability. They feature a high-performance threaded mounting system and a keyed body for repeatability and intermateability.
	MU		MU connectors contain a ferrule with a diameter of 1.25 mm. Applications include high-speed data communications, voice networks, telecommunications, and dense wavelength division multiplexing (DWDM). MU connectors are also used in multiple optical connections and as a self-retentive mechanism in backplane applications.
	SMA		Subminiature-A (SMA) connectors are intended for use on semi-rigid cables in components. They directly interface the cable dielectric without air gaps. They are not intended for permanent connections.
	Other		Other unspecified or unlisted connector configuration.
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Other Features


	External Indicators?		Devices include external indicators (normally LEDs) for states such as Talk, Listen, Receive, Send, Power, Ready, etc.
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	FIFO Buffer?		The first in, first out (FIFO) buffer is used to store acquired data temporarily. The data is retained only until it can be transferred to system memory or to another device. By buffering the data, the GPIB and host bus can access the data at the same time so that one bus does not have to wait for the other to complete a cycle.
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	CE / FCC Certified?		Devices meet requirements of the European Union's CE Marking system and/or the U.S. Federal Communications Commission (FCC).
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