6
4.3 注意事项Precautions
4.3.1 电压信号输入Voltage input
输入 电 压不 得高 于 产品的 额 定输 入 电 压的
120%
，在电压输入端须安装
1A
保险丝。
The input voltage must not exceed 120% of the
rated input voltage of the product. A 1A fuse must be
installed on the voltage input.
4.3.2 电流信号输入Current input
An external shunt or Hall current sensor should
be used for current input.
4.3.3 通讯接口接线Communication interface wiring
该仪表提供异步半双工 RS485 通讯接口，采用
MODBUS-RTU 协议，各种数据信息均可在通讯线路上
传送。理论上在一条线路上可以同时连接多达 128
个仪表，每个仪表均可设定其通讯地址（Addr）、
通讯速率（baud）也可通过设置选择。
The meter provides asynchronous half-duplex
RS485 communication interface using
MODBUS-RTU protocol, a variety of data
information can be transmitted on the communication
line.Theoretically, up to 128 meters can be connected
simultaneously on a single line. Each meter can be set
with its address (Addr), baud rate, or setting selection.
通讯连接建议使用三芯屏蔽线，每芯截面不小
于 0.5mm
2
，分别接 A、B，屏蔽层接大地，布线时应
使通讯线远离强电电缆或其他强电场环境。
The communication connection is recommended
to use three-core shielded cable, Cross-sectional area
of each core is not less than 0.5mm2, is connected to
A、 B respectively, shielding layer is connected to the
earth. The wiring should be kept away from strong
cables or other strong electric field environment.
建议起始端和最末端仪表的 A、B 之间均加匹
配电阻，阻值范围为 20Ω ～10kΩ 。
It is recommended to add matching resistors
between A and B of the meters at the beginning and
end. The resistance range is 20Ω to 10kΩ.
5 使用指南 Operation guide
5.1 按键 Key
测量模式下，按该键进入编程模式，仪表提示输入密码 PASS，输入正确密码后，可
对仪表进行编程设置；编程模式下，用于返回上一级菜单
In the measurement mode, press this key to enter the programming mode. The meter
prompts you to enter the password PASS. After you enter the correct password, you can
program the instrument; in the programming mode, it returns to the previous menu.
测量模式下，用于切换显示项目，查看各项电量，具体见显示菜单；
编程模式下，用于切换同级菜单或个位数的减小。
In the measurement mode, it is used to switch the display item and view the electrical
parameters, see the display menu for details;
In the programming mode, it is used to switch the menu of the same level or reduce the
number of ones place.
测量模式下，可查看相关参数，查看各项电量，具体见显示菜单；
编程模式下，用于切换同级菜单或个位数的增加。
In the measurement mode, it is used to switch the display item and view the electrical
parameters, see the display menu for details;
In the programming mode, it is used to switch the menu of the same level or add the
number of ones place.
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