UNS0007A-P,V1触发板,ABB配置说明
1.EIA-232-D高信号电平为+3至+15伏。低水平是−3.到−15伏。并联连接装置可能会产生超出范围的故障与规范相反。
2.EIA-232-D接口旨在将终端连接到调制解调器当计算机在没有调制解调器的情况下连接时，一个计算机必须配置为调制解调器，另一个配置为航空站接口特性EIA-232-D接口标准规定了串行二进制文件的所有参数使用不平衡线路在DTE和DCE设备之间进行数据交换。
UNS0007A-P,V1触发板EIA-232-D发射器和接收器参数适用于MVME2603/2604列于下表中。MVME2603/2604符合EIA-232-D规范。请注意尽管EIA-232-D标准建议使用短互连电缆长度不超过50英尺（15米），更长允许使用电缆，前提是在接口点（包括信号终端）不超过2500pF。EIA-530连接EIA-530接口在功能上补充了EIA-232-D接口。EIA-530标准定义了该接口的机械方面，用于传输串行二进制数据，包括同步和异步。它适用于平衡（双端）和不平衡（单端）信号，并提供更高的使用相同的DB-25连接器时，数据速率高于EIA-232-D。表B-4列出了在以下位置可用的EIA-530互连：MVME761串行端口3和4（板表面上的J7和J8）时端口通过串行接口模块配置为EIA-530 DCE或DTE端口。接口特性在指定DTE之间串行二进制数据交换的参数时和DCE设备，EIA-530标准假设使用平衡线路，除远程环回、本地环回和测试模式线路外，它们是单端的。平衡线路数据交换通常是优先用于不平衡线路数据交换，其中任何以下条件为准：
❏ 互连电缆太长，无法有效平衡活动
❏ 互连电缆暴露于外部噪声源这可能会导致多余电压超过测量的±1V在电缆负载端，50Ω 电阻器代替发射器。
❏ 有必要尽量减少对其他信号的干扰。
❏ 可能需要反转信号（例如，加极性正负极性标记可以通过反转电缆对）。
EIA-530接口发射器和接收器参数适用于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 50Ω 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/
