Specifications

C E N T A U R U S P R I M E
22
2222
22
Now, before you can control a point object you must first have selected a device
number and point number (see Modbus point map, Chapter 3).
(S)elect: Use this to select a valid point. Here is the Modbus variant:
CTL: (S)elect, (C)ontrol, (D)etail, (X)-it :S
CTL: You may select an OBJECT ID to target into.
Enter a valid, existing, Object ID (0 to 49999) : 11
The object at ID #1 is now selected.
And, here is the BACnet variation on the same theme:
CTL: (S)elect, (P)riority, (C)ontrol, (R)elease, (D)etail, (X)-it :S
CTL: You may select an OBJECT ID to target into.
Enter a valid, existing, BACnet Object TYPE/ID (0 to 4), (1 to 16000): 1,114
The object with Type 1 and Instance #114 is now selected.
(C)ontrol: (MODBUS version). This option will let you control the selected point.
Here is a simple MODBUS example of a digital point control to “off” (zero):
CTL: (S)elect, (C)ontrol, (D)etail, (X)-it :C
CTL: You may enter a new value to set the selected object to.
Enter a field value (0 or 1 for digitals; valid number for analogs) : 0
The new value of the object will be : 0
Adding to Control Queue, at #2. MB #1, Register: 1
Queued Control; Trunk #1, MB #1, Register: 1 -- to: 0.000
OK…so much for simple. Now let’s talk about BACnet (alias BADnet). There are
sixteen priorities. These are given below:
Priority
BACnet Default
Comments
1
Manual Life
-
Safety
Trane: User
-
Emergency
2
Automatic Life
-
Safety
Trane: Critical! (Programmatic; no mins)
3
Miscellaneous
Trane: “Minimum on/off”
4
Miscellaneous
Trane: “User
-
High”
5
Critical Equipment Control
Trane: Custom Programming
—
Hig
h