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FP-AS310 Flow Meter English Manual v1
FP-AS310 Flow Meter English Manual v1
  • ⚠Safety instructions
  • This instruction manual version is v1.0
  • Measure principle and usage scenario
  • Warranty
  • Exterior, Spec, Model
    • Device
    • Paddle set
    • T-connector
  • Installation and Configuration
    • Mechanism installation
    • Mechanical and electrical installation
    • Parameter Configuration
  • Human-Machine Interface (HMI)
    • Introduction the Human-Machine Interface (HMI)
    • 主畫面
    • Simulation Mode
    • Main Screen Data Interpretation
    • Password Entry Screen
    • Settings Screen
  • Communications
    • NPN output
    • Analog current output (4-20mA)
    • RS485 and Modbus RTU Setting
    • Modbus RTU Protocol
      • Read-only memory read instruction(04) and memory lists
      • 讀寫型記憶體讀取指令(03)
      • 讀寫型記憶體單Register寫入指令(06)
      • 讀寫型記憶體雙Register寫入指令(30)
      • Single Bit 資料讀寫指令(01/05)(人機介面常用)
  • Parameters Table
    • A Category Options and Descriptions
    • B Category Options and Descriptions
    • C Category Options and Descriptions
    • D Category Options and Descriptions
    • E Category Options and Descriptions
    • F Category Options and Descriptions
    • H Category Options and Descriptions
  • Alarm 及 系統狀態說明
  • Trouble and abnormality shooting
    • Iout 4-20mA debug process FP-AS310A
    • NPN alarm debug process FP-AS310A
    • NPN pulse Debug process FP-AS310A
    • RRS485 Debug Process FP-AS310R
  • Certification
  • FP-AS310 Product Page
  • LORRIC Website
  • LORRIC Integration and Application Center
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  • Communications format
  • Terminology
  • Definition and function of memory
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  1. Communications

Modbus RTU Protocol

Communications format

bit order: lsb first

byte order: big endian

Data bits:8

Parity: None

Stop bits: 1

Floating point number follows IEEE754-1985. The float32 below stands for 32bits Single precision floating point number.

Terminology

‌‌Register: Length of 2 Byte or 16bit which is unit length of memory in Modbus RTU.

‌Byte: 8 bit length

Definition and function of memory

Modbus Memory Access

Modbus-accessible memory is divided into two main categories: read-only and read/write.

  • The read-only memory primarily contains data related to the flow meter’s operational status, such as instantaneous flow rate. This category is the most commonly accessed memory area. Read-only memory can only be accessed using Function Code 04 (Read Input Registers).

Relevant register mappings and details can be found on the following page:

PreviousRS485 and Modbus RTU SettingNextRead-only memory read instruction(04) and memory lists

Last updated 20 days ago