The MIRG-221B module provides IRIG-B time code capability for the MEDAU/MCDAU/MWDAU-2000 miniature data acquisition unit. It can be placed in either a master or remote unit operating at up to 20 Mbps and will provide time code capability for the modules within that stack, allowing per-word or per-message time tagging capability for I/O modules in the stack that acquire bus data (e.g. 1553, ARINC-429, RS-232, etc.).