UNS0007A-P,V1觸發(fā)板,ABB配置說明
1.EIA-232-D高信號電平為+3至+15伏。低水平是?3.到?15伏。并聯(lián)連接裝置可能會產(chǎn)生超出范圍的故障與規(guī)范相反。
2.EIA-232-D接口旨在將終端連接到調(diào)制解調(diào)器當(dāng)計算機在沒有調(diào)制解調(diào)器的情況下連接時，一個計算機必須配置為調(diào)制解調(diào)器，另一個配置為航空站接口特性EIA-232-D接口標(biāo)準(zhǔn)規(guī)定了串行二進制文件的所有參數(shù)使用不平衡線路在DTE和DCE設(shè)備之間進行數(shù)據(jù)交換。
UNS0007A-P,V1觸發(fā)板EIA-232-D發(fā)射器和接收器參數(shù)適用于MVME2603/2604列于下表中。MVME2603/2604符合EIA-232-D規(guī)范。請注意盡管EIA-232-D標(biāo)準(zhǔn)建議使用短互連電纜長度不超過50英尺（15米），更長允許使用電纜，前提是在接口點（包括信號終端）不超過2500pF。EIA-530連接EIA-530接口在功能上補充了EIA-232-D接口。EIA-530標(biāo)準(zhǔn)定義了該接口的機械方面，用于傳輸串行二進制數(shù)據(jù)，包括同步和異步。它適用于平衡（雙端）和不平衡（單端）信號，并提供更高的使用相同的DB-25連接器時，數(shù)據(jù)速率高于EIA-232-D。表B-4列出了在以下位置可用的EIA-530互連：MVME761串行端口3和4（板表面上的J7和J8）時端口通過串行接口模塊配置為EIA-530 DCE或DTE端口。接口特性在指定DTE之間串行二進制數(shù)據(jù)交換的參數(shù)時和DCE設(shè)備，EIA-530標(biāo)準(zhǔn)假設(shè)使用平衡線路，除遠程環(huán)回、本地環(huán)回和測試模式線路外，它們是單端的。平衡線路數(shù)據(jù)交換通常是優(yōu)先用于不平衡線路數(shù)據(jù)交換，其中任何以下條件為準(zhǔn)：
? 互連電纜太長，無法有效平衡活動
? 互連電纜暴露于外部噪聲源這可能會導(dǎo)致多余電壓超過測量的±1V在電纜負載端，50? 電阻器代替發(fā)射器。
? 有必要盡量減少對其他信號的干擾。
? 可能需要反轉(zhuǎn)信號（例如，加極性正負極性標(biāo)記可以通過反轉(zhuǎn)電纜對）。
EIA-530接口發(fā)射器和接收器參數(shù)適用于MVME2603/2604列于表B-5和表B-6中。
Notes
1. A high EIA-232-D signal level is +3 to +15 volts. A low level is ?3
to ?15 volts. Connecting units in parallel may produce out-of-range
voltages and is contrary to specifications.
2. The EIA-232-D interface is intended to connect a terminal to a
modem. When computers are connected without modems, one
computer must be configured as a modem and the other as a
terminal.
Interface Characteristics
The EIA-232-D interface standard specifies all parameters for serial binary
data interchange between DTE and DCE devices using unbalanced lines.
EIA-232-D transmitter and receiver parameters applicable to the
MVME2603/2604 are listed in the following tables.
The MVME2603/2604 conforms to EIA-232-D specifications. Note that
although the EIA-232-D standard recommends the use of short
interconnection cables not more than 50 feet (15 m) in length, longer
cables are permissible provided the total load capacitance measured at the
interface point and including signal terminator does not exceed 2500pF.EIA-530 Connections
The EIA-530 interface complements the EIA-232-D interface in function.
The EIA-530 standard defines the mechanical aspects of this interface,
which is used for transmission of serial binary data, both synchronous and
asynchronous. It is adaptable to balanced (double-ended) as well as
unbalanced (single-ended) signaling and offers the possibility of higher
data rates than EIA-232-D with the same DB-25 connector.
Table B-4 lists the EIA-530 interconnections that are available at
MVME761 serial ports 3 and 4 (J7 and J8 on the board surface) when those
ports are configured via serial interface modules as EIA-530 DCE or DTE
ports.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 (for example, 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
MVME2603/
