| 詳細參數(shù) | |||
|---|---|---|---|
| 品牌 | NI | 型號 | GPIB-140A |
| 結(jié)構(gòu)形式 | 模塊式 | 安裝方式 | 控制室安裝 |
| LD指令處理器 | 硬PLC | 功能 | 總,線,擴展器 |
| 工作電壓 | 電源組24VDC | 產(chǎn)品認證 | EU |
| 環(huán)境溫度 | -40°C-70°C | 環(huán)境濕度 | 5至95%,非冷凝 |
| 加工定制 | 否 | 重量 | 0.55磅 |
| 外形尺寸 | 3.5,5.65,1.62英寸 | ||
NI GPIB-140A?總線擴展器
GPIB總線擴展器—GPIB-140A可將GPIB系統(tǒng)的線纜延長一千米，而不會影響GPIB的完整性，也無需修改軟件。該配件使用緩沖傳輸技術(shù)，數(shù)據(jù)傳輸速率高達1.1 Mb/s (IEEE 488.1)或2.8 Mb/s (HS488)。GPIB-140A還可以將GPIB系統(tǒng)中GPIB設(shè)備數(shù)量從15個增加到26個。
GPIB-140A是指一種國家儀器公司的GPIB擴展器將GPIB擴展到1公里的距離。GPIB-140A和GPIB-140A/2總線擴展器符合ANSI/IEEE標(biāo)準(zhǔn)488.1-1987和ANSI/IEEE標(biāo)準(zhǔn)488.2-1992，包括協(xié)議。使用GPIB擴展器，您可以克服以下兩種配置IEEE 488施加的限制：
?每個連續(xù)總線的電纜總長度限制為20米，或總線上每個設(shè)備的電纜長度限制為2米，以較小者為準(zhǔn)
?每個連續(xù)總線的電氣負載限制為15個設(shè)備每個GPIB-140A系統(tǒng)將GPIB擴展到1公里的距離，每個GPIB-140A/2系統(tǒng)將GPIB擴展至2公里的距離。這兩個系統(tǒng)都可以擴展加載限制為28個設(shè)備（包括GPIB擴展器），而不犧牲速度或性能表演您可以將這些點對點擴展系統(tǒng)串聯(lián)更長時間距離或星形圖案，用于額外加載。使用HS488協(xié)議，擴展上的數(shù)據(jù)傳輸速率大于2.8 Mbytes/s。GPIB擴展器使用帶串行擴展總線的緩沖傳輸技術(shù)，使性能化，布線成本最小化。此外，擴展器也可以不影響分機同一側(cè)設(shè)備之間的傳輸速率。GPIB擴展器還可以檢查錯誤，以確保通過光纖成功傳輸數(shù)據(jù)鏈接
GPIB-140A refers to a National Instruments GPIB extender that extends the GPIB to a maximum distance of 1 km.
The GPIB-140A and GPIB-140A/2 bus extenders comply 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-140A system extends the GPIB to a maximum distance of 1 km, and each GPIB-140A/2 system extends the GPIB to a maximum distance of 2 km. Both systems extend?the loading limit to 28 devices (including the GPIB extenders), without sacrificing speed or perbance. You can connect these point-to-point extension systems in series for longerdistances 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 perbance 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 b.
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