Some field devices will have resistors which can be switched in. For other devices,
terminating resistors may need to be added. A typical value is 120 ohms across the
+ and - pins. In particularly noisy environments, the resistor can be split into 60
ohms from + to ground and 60 ohms from - to ground.
11/98 3-1 U3-1050
Westinghouse Proprietary Class 2C
Section 3. Software Configuration
3-1. Section Overview
This section describes the software configuration needed for the interface between
an Ovation LC card and a device which communicates using the Modbus protocol.
The following procedures must be performed in order to use the LC/Modbus
Interface:
• Create a configuration file (Section 3-2).
• Create an AUTOEXEC.BAT file (Section 3-3).
• Copy the DLMODBUS.EXE program, the configuration file, and the
AUTOEXEC.BAT file to the LC card (Section 4).

一些现场设备将具有可切换的电阻器。对于其他设备，
可能需要添加端接电阻器。跨接导线的典型值为120欧姆
+和-别针。在特别嘈杂的环境中，电阻器可分为60个电阻
从+到接地和从-到接地分别为60欧姆和60欧姆。
1998年11月3-1 U3-1050
西屋专有2C级
第三节。软件配置
3-1. 章节概述
本节描述了之间接口所需的软件配置
Ovation LC卡和使用Modbus协议进行通信的设备。
要使用LC/Modbus，必须执行以下程序
接口：
•创建配置文件（第3-2节）。
•创建一个AUTOEXEC。BAT文件（第3-3节）。
•复制DLMODBUS。EXE程序、配置文件和
自动执行。将BAT文件发送至LC卡（第4节）。