Honeywell HX2 Reference Manual page 282

Click the Download certificate link.
Click Save to download and store the user certificate to the PC. Make sure to keep track of the name and location of the
certificate. The private key file is also downloaded and saved during this process.
Be sure use the same name for the certificate file as was used for the private key file. For example, it the private key was
saved as USER.PVK then the certificate file created must be given the same name, for example, USER.CER.
Install the user certificate.
6-52