Cirrus Logic CS485 Spécifications télécharger pdf (Page 28)

C E N T A U R U S P R I M E

2525

Field In / Out Counts : 0 / 0 Field Value : 0.000

Field Hi / Lo Range : 255.000 / 0.000 Eng. Units : Deg F.

And this is what is displayed for an example BACnet controllable object that has been

released from all controls (note the line that says “No elements in priority/control

array”:

CTL: (S)elect, (P)riority, (C)ontrol, (R)elease, (D)etail, (X)-it :D

BACnet Obj_ID 113, Type = AO, “Max Cooling Flow SPT”

No elements in priority/control array

Field Unit / Subunit : 4 / 0 Field Address :30001

Object Flags / Errors : 0 / 0

Field In / Out Counts : 0 / 0 Field Value : 0.000

Field Hi / Lo Range : 10000.000 / 0.000

Engineering Units : Percnt

Had any priorities have controls in them, it would have displayed the priority and the

control value, for EACH priority level.

SPECIAL NOTE FOR BO point #14 (Recalibration):

This point is, according to Trane, the “recalibration” point for a VAV box. It is

pathetically slow in acting. The Trane manual errata sheet says that you must control

the point ON for five minutes, then turn it OFF. The actual feedback from the point

does show ON, but only for about 20 seconds, so the feedback is fairly useless (and, in

fact, we suggest that you NOT define it!). However, the Trane documentation also

says that it takes up to 15 minutes to drive the damper full closed to do the calibrations.

It has been found that in real life, it takes sometimes 20 to 25 minutes to actually do

the physical damper motion and recalibration. Have patience!

“Watch” Menu Options

The “Watch” menu will let you select various methods for monitoring the real time

data from the field.

(Q)uiet: Use the (Q) key to halt any of the following monitoring options.

(1),(2),(3),(4) to Watch Trunks: Enter a Trane VAV trunk to monitor. This will display

the field scan of all Trunk devices and the status of their points in real time. What is

displayed below is the Modbus variant (it shows the register numbers in the second

column); the BACnet variation is the same except it shows the BACnet object

instances in the second column:

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Cirrus Logic CS485 Spécifications Page 28