46 Rev. 2.4 (3/05)
Honeywell Analytics CM4 Protocol Manual
Get Duty Cycle This command allows the master to nd out the
0x69 minimum window time and the monitor relay
action during duty cycle bits on a slave. The
minimum window time (or duty cycle) defaults to
zero seconds. But it may be set larger to conserve
tape in installations that have some concentration
of gas for long periods of time. The tape will not
advance until the minimum window time has
accumulated even if the tape is saturated. During
periods when the tape is saturated but prevented
from advancing, the CM4 will continue to report
the most recent concentration reading.
Unfortunately it will not be able to detect any
changes in concentration during this period
because the tape is saturated.
By default, the monitor relay (RY6) will energize
when monitoring is temporarily suspended
because of tape saturation. However this reaction
can be inhibited for individual points.
The “monitor relay action during duty cycle” bits
default to TRUE but can be set to FALSE via
either the keypad or serial packet 0x65, Set Duty
Cycle.
Command Packet to slave:
Command code (0x69) - 1 byte
Response from slave:
Command code (0x69) - 1 byte
CM4 date 2 bytes
CM4 time 2 bytes
Bits permitting monitor relay action during
Duty cycle - 1 byte
bit 0 point1
bit 1 point2
bit 2 point3
bit 3 point4
bits 4-7 unused (always 0)
Minimum window time (seconds) - 2 bytes
Status - 1 byte (always 0x00)
To Next Page
Loading...
