描述
PCI-485I2? ? ? 2 端口、串行接口板
PCI -485/2(部件號:777641-02)是一款雙端口、非并發(fā)串行通信卡,適用于 PCI 總線 PC。它們長 6.5 英寸(165 毫米),可能會引入 PCI-Z、5V PCI 或 3.3 插槽中。每個空閑端口都支持RS-485調(diào)整模式傳輸/采集,也支持單端傳輸/采集。PCI-485/2的每個端口都可以包含偏置電壓。在此模型中,為了保證通信,RS-485 應(yīng)提供框架中一個發(fā)射器所需的偏置電壓,目的是在所有發(fā)射器關(guān)閉時提供已知的“零”狀態(tài)。此外,系統(tǒng)每一端的接收方通信都應(yīng)該結(jié)束,以避免振鈴。 PCI -485/2通過卡上的跳線方法支持這些選項。
在PCI-485/2中,16550 UART 類型被用作另類的通信組件。該儀器中集成了 16 字節(jié)發(fā)送/接收器 FIFO 緩沖區(qū),旨在確保多任務(wù)框架中不會丟失信息,同時保持與第一個 IBM 串行端口 100% 的相似性。在此儀器中,用戶會發(fā)現(xiàn)卡上有一個晶體振蕩器,可實現(xiàn)高于 115,200 的精確波特率。NI PCI-485/2上的最大波特率優(yōu)于 460,800 波特,并且可以通過更改卡上的跳線來實現(xiàn)。使用的驅(qū)動器/接收器類型為 75ALS180,適合以高波特率驅(qū)動很長的通信線路。如果通信之間出現(xiàn)問題,驅(qū)動器/接收器具有熱關(guān)閉功能。當(dāng)該卡首次使用時,工作框架應(yīng)自動識別并安排兩個 COM 端口以便及時使用。
PCI-485I2? ? 2 端口、串行接口板
Pci-485/2 (Part number: 777641-02) is a dual-port, non-concurrent serial communication card for PCI bus PCS. They are 6.5 inches (165 mm) long and may be introduced into PCI-Z, 5V PCI, or 3.3 slots. Each free port supports RS-485 adjusted mode transmission/collection, as well as single-ended transmission/collection. Each port of PCI-485/2 can contain a bias voltage. In this model, to guarantee communication, RS-485 should provide the bias voltage required for one transmitter in the frame, with the aim of providing a known “zero” state when all transmitters are off. In addition, receiver communication at each end of the system should end to avoid ringing. PCI-485/2 supports these options through the jumper method on the card.
In PCI-485/2, the 16550 UART type is used as an alternative communication component. A 16-byte transmit/receiver FIFO buffer is integrated into the instrument, designed to ensure that no information is lost in the multitasking framework while maintaining 100% similarity to the first IBM serial port. In this instrument, the user will find a crystal oscillator on the card that achieves an accurate baud rate higher than 115,200. The maximum baud rate on the NI PCI-485/2 is better than 460,800 baud and can be achieved by changing the jumper on the card. The driver/receiver type used is 75ALS180, which is suitable for driving very long communication lines at high baud rates. If there is a problem between communications, the drive/receiver has a thermal shutdown function. When the card is used for the first time, the working framework should automatically identify and arrange two COM ports for timely use.
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