Honeywell 621-9938R Serial I/O Module I/O Communication Module 27 cm × 13

27 cm × 13

Dimensions: Typically designed to fit standard elevator control cabinet sizes (exact dimensions may vary)

Percent restrained and unrestrained differential protection

and heavy industrial plants

Honeywell 621-9938R Serial I/O Module I/O Communication Module 27 cm × 13Description The Honeywell 621 9938R Serial Input Output Module (SIOM) is a redundant communication unit designed for Honeywell TDC 3000 systems. It manages the serial I O card file and interfaces with the 621 9939 Serial Link Module, ensuring reliable data exchange in mission critical industrial automation. Specifications Manufacturer: Honeywell Model Number: 621 9938R Type: Serial I O Module (SIOM) System Compatibility: Honeywell TDC 3000 ISSC 600