KUAX 680I V.24 PLC Module 68142304
The KUAX 680I V.24 (part number 681.423.04) is a serial communication module used in industrial PLC and control systems. It provides a V.24 (RS-232) interface for connecting peripheral devices such as barcode readers, printers, modems, or operator terminals. The module is designed for DIN rail mounting and is typically part of a modular PLC system from German manufacturer KUAX (Kübler Group).
Technical Specifications
Interface: RS-232 (V.24), 9-pin D-sub female.
Baud rates: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400 bps.
Data format: 7 or 8 bits, 1 or 2 stop bits, parity none/even/odd.
Signal lines: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND.
Isolation: 500 Vrms between interface and logic.
Hardware Description
The module is built on a 100 mm x 75 mm PCB, encased in a plastic housing with IP20 protection. It has a 10‑pin header for connection to the PLC backplane (parallel bus) and a 9‑pin D-sub connector on the front. A set of DIP switches (8 positions) allows configuration of address, baud rate, and protocol. LED indicators: PWR (green), Tx (yellow), Rx (yellow), ERR (red).
Power and Environment
Supply voltage: 24V DC (18–30V). Power consumption: 2 W. Operating temperature: 0 to 55°C; storage: -20 to 70°C. Humidity: 10% to 90% non-condensing. The module is CE marked and RoHS compliant.
Communication Protocols
The KUAX 680I supports both transparent ASCII (non‑procedural) and a proprietary binary protocol for communication with a host PLC. The module can be configured as a Modbus RTU slave (optional firmware). It contains a 256‑byte FIFO buffer for incoming data to prevent overrun.
Integration with PLC
The module is addressed as a special I/O unit in the KUAX PLC system. The user program can send and receive data using specific function blocks (e.g., SEND_RECV). The module supports baud rate autodetection (on some firmware versions).
Typical Applications
Connecting a weigh scale to a PLC, collecting data from a barcode scanner, or sending production reports to a line printer. It is also used for uploading parameter sets from a USB‑to‑serial converter.
Ordering and Documentation
Part number: 681.423.04 (KUAX 680I V.24). The module includes a 9‑pin D-sub connector hood and mounting clips. Manual: KUAX 680I Serial Interface Module User Guide (Doc. KUAX-680I-EN).
