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General| Communication protocol | MODBUS RTU |
|---|---|
| Interface | RS-485 |
| Baud rate | 9600, 19200, 38400, 57600, 115200 bps |
| Address range | 1 - 247 |
| Power supply | 24 VDC ±10% |
| Data format | 8 data bits, 1 stop bit, even parity |
| Supported functions | Read Holding Registers, Write Single Register, Write Multiple Registers |
| Relative humidity | 5% to 95% (non-condensing) |
Specifies that this technical information complements operating instructions for completeness.
Details the meaning of warning triangles (hazards) and information icons (advice).
Defines MODBUS RTU as an international, open field bus standard for automation applications.
Describes the pure bus system structure based on the EIA/TIA-RS485 standard.
Illustrates unsegmented and segmented bus structures with masters and repeaters.
Specifies the maximum active nodes per channel (63) and the role of repeaters.
Details maximum bus line length (1000m) and the impact of stub lines.
Explains the necessity of line terminations for reliable data transfer and their placement.
Describes the function of bias resistors in maintaining a defined voltage potential on data lines.
Explains the designation of D+, D-, GND, and +24V connections for MODBUS.
Details the RJ45 pin configuration for 2W-MODBUS according to the specification.
Shows the pin assignment for 4-pin Phoenix MSTB 2.5 connectors used in MODBUS.
Discusses the importance and installation of shielded cables for EMI protection.
Defines MODBUS as an application layer protocol for master-slave communication.
Introduces the necessity of matching communication parameters between master and slave devices.
Lists key MODBUS parameters like address, transmission rate, parity, and mode.
Explains the process of setting slave addresses, their importance, and valid ranges.
Introduces Ziehl-Abegg devices equipped with an RS-485 interface for MODBUS-RTU.
Explains application data organization into registers and access via MODBUS functions.
Details methods for setting slave addresses, including automatic addressing options.
Presents oscilloscope traces of bus signals to illustrate signal quality and termination effects.
Offers solutions for common MODBUS communication issues like no response and transmission errors.
Provides contact information and website for Ziehl-Abegg AG.
Guides users on technical support, service procedures, and document downloads.
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