A&D Weighing FS-04i RS-485 & Relay Output

The A&D FS-04i is an optional communication interface for A&D FS-i and FS-D Series checkweighing scales. It adds RS-422/RS-485 serial communication along with comparator relay outputs, allowing the scale to connect to PLCs, industrial controllers, and automated production equipment. This makes it an excellent solution for checkweighing, filling, packaging, and quality control systems.

RS-485 communication is designed for longer cable runs, improved noise resistance, and multi-device networking. With the FS-04i, a single computer can communicate with up to 16 compatible FS-i scales, making it ideal for production lines, warehouses, and manufacturing facilities where multiple scales need to be monitored from one location.

The FS-04i provides HI, OK, and LO comparator relay outputs that automatically indicate whether a measured weight is above, within, or below preset limits. These relay signals can trigger external devices such as warning lights, buzzers, conveyors, reject mechanisms, or PLC-controlled equipment, helping reduce manual inspection and increase production efficiency.

The FS-04i is specifically designed for A&D FS-i Series and FS-D checkweighing scales. It installs as an optional interface to expand communication and automation capabilities while maintaining the scale's high-speed weighing performance. Before ordering, confirm that your scale model belongs to the FS-i or FS-D product family.

No. The FS-03i (RS-232C with comparator relay output) and FS-04i (RS-422/RS-485 with comparator relay output) are alternative interface options that cannot be installed simultaneously because they use the same internal option slot. If your application requires industrial multi-drop networking and longer communication distances, the FS-04i is the preferred choice.