IS230TNCIH4C燃機(jī)模塊，GE英文說明
接口特性在指定DTE和之間串行二進(jìn)制數(shù)據(jù)交換的參數(shù)時(shí)DCE設(shè)備，EIA-530標(biāo)準(zhǔn)假設(shè)使用平衡線路，除了對(duì)于遠(yuǎn)程環(huán)回、本地環(huán)回和測(cè)試模式線路單端。平衡線路數(shù)據(jù)交換通常用于優(yōu)先考慮不平衡線路數(shù)據(jù)交換，其中存在以下任何情況：以條件為準(zhǔn)：? 互連電纜太長，無法進(jìn)行有效的不平衡操作。? 互連電纜暴露于可能導(dǎo)致導(dǎo)致不需要的電壓超過差分測(cè)量的±1V在信號(hào)導(dǎo)體和電纜，帶50? 替代變送器的電阻器。
IS230TNCIH4C燃機(jī)模塊? 有必要盡量減少對(duì)其他信號(hào)的干擾。? 可能需要反轉(zhuǎn)信號(hào)（例如，正負(fù)極性標(biāo)記極性標(biāo)記可以通過反轉(zhuǎn)電纜對(duì)來實(shí)現(xiàn)）。EIA-530接口發(fā)射器和接收器參數(shù)適用于MVME162列于表A-5和A-6正確接地需要考慮的一個(gè)重要問題是接地引腳的使用。有兩個(gè)針腳標(biāo)記為GND。針腳7是信號(hào)接地，必須連接到遠(yuǎn)端完成電路的裝置。針腳1是機(jī)箱接地，但必須使用小心。機(jī)箱通過綠色電纜連接至電源接地電源線中的電線，必須連接以符合電氣規(guī)范。問題是，當(dāng)裝置連接到不同的電源插座時(shí)，地電位可能有幾伏的差異。每個(gè)的If引腳1該裝置通過電纜和其他裝置互連，電流為幾安培可能導(dǎo)致。這種情況可能不僅對(duì)中的小導(dǎo)線有危險(xiǎn)一種典型的電纜，但也可能產(chǎn)生電噪聲，導(dǎo)致數(shù)據(jù)錯(cuò)誤傳輸這就是為什么表A-1和A-4顯示引腳1沒有連接。通常情況下，針腳7（信號(hào)接地）只應(yīng)連接到底盤接地在某一點(diǎn)上；如果一臺(tái)計(jì)算機(jī)使用多個(gè)終端，則邏輯位置因?yàn)檫@一點(diǎn)是在計(jì)算機(jī)上。端子不應(yīng)連接邏輯接地回路和機(jī)箱之間。
Interface Characteristics
In specifying parameters for serial binary data interchange between DTE and
DCE devices, the EIA-530 standard assumes the use of balanced lines, except
for the Remote Loopback, Local Loopback, and Test Mode lines, which are
single-ended. Balanced-line data interchange is generally employed in
preference to unbalanced-line data interchange where any of the following
conditions prevail:
? The interconnection cable is too long for effective unbalanced operation.
? The interconnection cable is exposed to extraneous noise sources that may
cause an unwanted voltage in excess of ±1V measured differentially
between the signal conductor and circuit ground at the load end of the
cable, with a 50? resistor substituted for the transmitter.
? It is necessary to minimize interference with other signals.
? Inversion of signals may be required (e.g., plus polarity MARK to minus
polarity MARK may be achieved by inverting the cable pair).
EIA-530 interface transmitter and receiver parameters applicable to the
MVME162 are listed in Tables A-5 and A-6Proper Grounding
An important subject to consider is the use of ground pins. There are two pins
labeled GND. Pin 7 is the signal ground and must be connected to the distant
device to complete the circuit. Pin 1 is the chassis ground, but it must be used
with care. The chassis is connected to the power ground through the green
wire in the power cord and must be connected to be in compliance with the
electrical code.
The problem is that when units are connected to different electrical outlets,
there may be several volts of difference in ground potential. If pin 1 of each
device is interconnected with the others via cable, several amperes of current
could result. This condition may not only be dangerous for the small wires in
a typical cable, but may also produce electrical noise that causes errors in data
transmission. That is why Tables A-1 and A-4 show no connection for pin 1.
Normally, pin 7 (signal ground) should only be connected to the chassis ground
at one point; if several terminals are used with one computer, the logical place
for that point is at the computer. The terminals should not have a connection
between the logic ground return and the chassis.
