10 Rev. 2.4 (3/05)
Honeywell Analytics CM4 Protocol Manual
Generic Responses
The CM4 monitor will return generic responses to the equipment if
there is not a specic response dened, or if there is a problem in the
communication transactions. There are four generic responses. Each of
these response packets are 5 bytes, and contain only the start byte,
address, length command code, and checksum.
ACK - 0x20 This is used for an acknowledgement of
a command.
NAK - 0x21 This is used for a negative acknowledgement of
command. The last received command had an
incorrect checksum.
Bad CMD - 0x66 This is sent to the master when the command
is expected or is not appropriate for the
current state.
Unknown CMD - This response is sent by the slave when a 0x67
command is not recognized.
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