BENGBUZZQY 8-Way Weighing Sensor Signal Converter RS485 Modbus-RTU Multi-channel Load Cell Module 1/500,000 Resolution

 Technical Specifications

 1 General Technical Specifications

Power Supply: DC 10–28VDC

Power Consumption: < 2W

Operating Current: Varies with the number of external sensors and supply voltage; drive capability 500 mA

Operating Environment: Temperature −40~85°C; Humidity 0%~95% RH, non-condensing

Isolation & Protection: Opto-isolation, power isolation, surge protection (not included in the basic version)

Protection Level: IP65

Mounting Method: Mounting holes / rail mounting

Weight:≈ 250 g

 2 Sensor Interface Performance

Supported Sensor Types: All Wheatstone bridge strain-type sensors

Sensor Excitation Voltage: 5VDC ±3%

Sensor Drive Capability: 4 × 350Ω sensors per channel

Number of Channels: 6–8 channels

Input Signal Range: 0 – ±30 mV

Temperature Coefficient:≤ 0.01% of reading + 0.3 d/°C

Non-linearity Error:≤ 0.003% F.S.

Stable Resolution: 1/500000

Sampling Rates: 10Hz, 40Hz, 640Hz, 1280Hz

Sampling Method: Sigma-Delta AD

 3 Communication Interface

Communication Method: RS485

Communication Protocol: Standard Modbus RTU protocol; supports function codes 03, 06, 16 (0x10)

Baud Rates: 2400, 4800, 9600, 19200, 28800, 38400, 57600, 115200, 128000, 230400, 256000, 460800, 500000, 512000, 600000 (configurable by software and DIP switches)

Slave Software Address: 1–255; Broadcast address 254

Slave DIP Address: 0–15

 4 Factory Default Parameters

Baud Rate: 115200

Data Bits: 8

Stop Bits: 1

Parity: None

Module Address: 1

CRC Byte Order: Little-endian

Data Byte Order: 2143

 Register Description

All registers are located in the non-volatile holding register area of the Modbus protocol. Each register contains a 16-bit number. Some functions of the module are represented in 32-bit format; for example, the real-time weight register is represented as a 32-bit signed value. A 32-bit value uses two adjacent registers combined into a 32-bit number, where the lower-address register is the low word of the 32-bit number. When programming the host, pay attention to the configuration of high and low words; otherwise the numbers read will be incorrect. All 32-bit registers must be read and written as 32-bit signed values. Although sometimes reading only the low word of a 32-bit register (in 16-bit mode) may display correctly, this often causes abnormal display for negative or large numbers.