串行通信
仪表支持通过RS-485端口进行串行通信。
在RS-485网络中，有一个主设备，通常是连接RS-485的以太网
网关。它提供了与多个从站进行RS-485通信的方法
设备（例如，仪表）。适用于只需要一个专用
计算机与从设备通信，USB到RS-485转换器可以
用于连接到主设备。
单个RS-485总线上多可连接32个设备。
RS-485网络配置
连接RS-485端口并接通仪表电源后，必须
配置串行通信端口以便与仪表通信。
同一RS-485通信总线上的每个设备必须具有的
地址和所有连接的设备必须设置为相同的协议、波特率、，
和奇偶校验（数据格式）。
注意：要使用离子设置与仪表通信，必须设置
串行站点和RS-485网络中的所有连接设备具有相同的奇偶校验
背景
对于没有显示器的仪表，必须首先连接并配置每个仪表
将这些仪表分别连接到同一RS-485总线之前。
RS-485端口设置
仪表出厂时配置了默认串行通信设置
在将仪表连接到RS-485总线之前，您可能需要进行修改。
仪表出厂时配置有以下默认串行通信
设置：
•协议=Modbus RTU
•地址=1
•波特率=19200
•奇偶性=偶数
您可以使用通信转换器（USB到RS-485或RS-232到RS-485）
或以太网网关设备连接到仪表。
使用显示器设置串行通信
串行端口设置屏幕允许您配置仪表的RS-485
通信端口，以便您可以使用软件访问仪表数据或
远程配置仪表。
1、导航至Maint>Setup。
2、输入设置密码（默认为“0”），然后按OK。
3、按Comm。
4、移动光标指向要修改的参数，然后按
编辑
5、根据需要修改参数，然后按OK。
6、移动光标指向下一个要修改的参数，按Edit，
进行更改，然后按OK。

Serial communications The meter supports serial communication through the RS-485 port. In an RS-485 network, there is one master device, typically an Ethernet to RS-485 gateway. It provides the means for RS-485 communications with multiple slave devices (for example, meters). For applications that require only one dedicated computer to communicate with the slave devices, a USB to RS-485 converter can be used to connect to the master device. Up to 32 devices can be connected on a single RS-485 bus. RS-485 network configuration After you have wired the RS-485 port and powered up the meter, you must configure the serial communications port in order to communicate with the meter. Each device on the same RS-485 communications bus must have a unique address and all connected devices must be set to the same protocol, baud rate, and parity (data format). NOTE: To communicate with the meter using ION Setup, you must set the serial site and all connected devices in the RS-485 network to the same parity setting. For meters that do not have a display, you must first wire and configure each one separately before connecting these meters to the same RS-485 bus. RS-485 port setup The meter is factory-configured with default serial communications settings that you may need to modify before connecting the meter to the RS-485 bus. The meter is factory-configured with the following default serial communications settings: • Protocol = Modbus RTU • Address = 1 • Baud rate = 19200 • Parity = Even You can use a communications converter (USB to RS-485 or RS-232 to RS-485) or Ethernet gateway device to connect to the meter. Setting up serial communications using the display The Serial Port setup screen allows you to configure the meter’s RS-485 communications port so you can use software to access the meter’s data or configure the meter remotely. 1. Navigate to Maint > Setup. 2. Enter the setup password (default is “0”), then press OK. 3. Press Comm. 4. Move the cursor to point to the parameter you want to modify, then press Edit. 5. Modify the parameter as required, then press OK. 6. Move the cursor to point to the next parameter you want to modify, press Edit, make your changes, then press OK.