Energy Saver Delay; Bacnet Ms/Tp - Critical Room Control CRC-FHM User Manual

Energy Saver Delay

This feature will automatically change the mode from "In Use" to "Standby" after the number of
minutes entered into the "Set Energy Saver Delay" has expired. This feature can be used with or
without an occupancy sensor. This feature can also be turned off by selecting "Off" in the Set
Energy Saver Delay value on the Alarm Setup Screen. Thirty (30) seconds before the unit is
automatically switched to "Standby" Mode, a warning will appear on the screen and a beep will
sound every second until mode is changed to standby.
With Occupancy Sensor: When an occupancy sensor is wired into DI1, the unit will not start the
Energy Saver Delay countdown until the occupancy sensor opens the contact to DI1 (unoccupied).
After the countdown is complete - the unit will switch to Standby Mode.
Without Occupancy Sensor: If no occupancy sensor is wired to DI1, then the unit will start the
Energy Saver Delay countdown as soon as it is put into the "In Use" mode. When the countdown
is completed, the unit will automatically change to "Standby" mode.

BACnet MS/TP

For BACnet communications over a three wire RS 485 trunk, enter the appropriate network
parameters for this device:
• Baud Rates: 9600, 19,200, 38,400, 57,600, 76,800, 115,200
• MAC Address: 0 - 254
• Instance ID: 1 - 4,194,304
Debug Information: If selected, this feature will display network traffic and communication
information on the main screen.
Configure as a Token Passing Device or as a Slave Device: If the device's MAC Address is set
between 0 and 127, it is configured as a token passing device – which enables "Dynamic Binding",
response to "Who Is" requests, and participation in token passing.
Setting this device's Slave Address between 126 and 254 will configure this device as a dedicated
slave device which will greatly reduce network overhead / traffic, but requires the device NOT to
support "Dynamic Binding", respond to "Who Is" requests, or participate in token passing.
Physical Network
Connection to the RS485 requires a three wire bus consisting of a positive, negative, and ground
/ common wire. Typically, devices on a RS485 network are a series circuit or "Daisy-Chained"
together.
An MS/TP EIA-485 network should use a three wire shielded twisted pair cable with characteristic
impedance between 100 and 130 ohms. Distributed capacitance between conductors should be
less than 100pf per meter. Foil and braided shields are acceptable. The maximum recommended
length of an MS/TP segment is 4,000 feet with AWG 18. The maximum number of nodes per
segment is 32. An MS/TP EIA-485 network should have no T connections. A termination of
20ohms +-5% should be connected at each of the two ends of the segment medium. No other
terminations should be used at intermediate nodes.
Fume Hood Monitor and Controller – User Guide 19 © 2016 CRITICAL ROOM CONTROL