Industrial RS485 4-Channel Load Cell Converter Digital Weighing Transmitter Support Modbus RTU Isolation Protection

Parameter

Specification

Power Supply

10–28V DC, <2W

Operating Current

Depends on connected sensors, max drive 500mA

Channels

2–4 load cell inputs

Sensor Excitation

5V DC ±3%

Sensor Drive

Up to 4 × 350Ω sensors per channel

Input Signal Range

0 to ±30 mV

Resolution

1/500000

Sampling Rates

10Hz, 40Hz, 640Hz, 1280Hz (selectable)

ADC Type

Sigma-Delta

Communication

RS485, Modbus RTU, Function Codes 03/06/16

Baud Rates

2400–600000 bps (configurable via DIP or software)

Slave Address

1–255, broadcast = 254

Isolation & Protection

Optical isolation, power isolation, surge protection

Operating Temp

–40 to +85°C

Humidity

0–95% RH (non-condensing)

Protection Level

IP65

Mounting

DIN rail or fixed mounting

Weight

~250g

Communication Interface

The transmitter provides RS485 communication with standard Modbus RTU protocol, ensuring compatibility with PLCs, DCS, and industrial PCs.

Specifications:

Item

Specification

Interface

RS485 (2-wire differential)

Protocol

Modbus RTU

Supported Function Codes

03 (Read), 06 (Write Single Register), 16 (Write Multiple Registers)

Baud Rate Options

2400, 4800, 9600, 19200, 28800, 38400, 57600, 115200, 128000, 230400, 256000, 460800, 500000, 512000, 600000 bps

Slave Address (software)

1–255 (default = 1), broadcast = 254

Slave Address (DIP)

0–15 (DIP switch configuration)

Default Settings

Baud rate: 115200, Data bits: 8, Stop bit: 1, Parity: None, Address: 1, Byte order: Little-endian (2143)

RS485 Cabling:

Maximum distance: up to 1200 m at 9600 bps.

For short-distance debugging, ordinary cables are acceptable. For longer runs, use shielded twisted pair cables.

For multi-drop connections, connect a 120Ω termination resistor across A and B at the end of the line.

Indicators & Reset:

P (Power): Always ON when powered.

G (Comm): Blinks during communication (frequency depends on baud rate).

T (TX): Blinks when transmitting.

R (RX): Blinks when receiving.

Reset button: Hold >3s to restore factory defaults (⚠ clears calibration data).