Honeywell CM4 Operating Instructions Manual page 31

Serial communication protocol
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Get Filter Life
0x44
This command returns the user's settings for total
filter lifetime. Lifetime is set by the user to indicate
how often the filters should be changed.
A maintenance fault will be issued when the filters
are this old. The valid range is 30 to 365 days.
Zero lifetime means a filter maintenance.
Command Packet to slave:
Command code (0x44) - 1 byte
Response from slave:
Command code (0x44) - 1 byte
CM4 date - 2 bytes
CM4 time - 2 bytes
Internal filter life - 2 bytes
External filter life - 2 bytes
Status - 1 byte (alway
26
CM4 Protocol Manual
Rev. 2.4 (3/05)

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