Merlin for MCH 5.01 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. Merlin for MCH lies within Internet & Network Tools, more precisely Network Tools.
This free tool was originally created by Excalibur Systems. The default filename for the program's installer is merlinMCH.exe. The most popular version among the software users is 5.0. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
MerlinMCH is a Windows based GUI test and simulation program for MIL-STD-1553 bus communications data. The program enables avionics equipment testers to send and receive messages in Bus Controller, Remote Terminal and Sequentional Monitor modes by defining raw data. In Sequential Monitor mode the user has the additional option of defining data with engineering units.
You may want to check out more software, such as Merlin MRP Factory Server, Merlin X2 or MERLIN Messaging Release System Administration, which might be related to Merlin for MCH.