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CONTEMPORARY CONTROLS BAST-421C-B2 BACnet Communicating Thermostat User Manual
** NOTE:
1. Changing these values needs to unlock modification for communication parameters in advance. Please refer to the parameter
LOC(Lock, AV17) for details.
2. Device instance number = “devH” *1000 + “devL” = 0~4194302. ex. If “devH” is 100 and devL” is 001then the Device instance
number = 100001.
Lock Function Setup and Examples
The 16-bit binary encoded decimal register accessed through Lock [AV17] BACnet object
and LOC engineering menu item is used to enable/disable features in the thermostat. The
first 10 bits are used (bit 0 ~ bit 9), bits 10~15 are reserved/unused. Bits are represented by
their decimal values and are added or subtracted to toggle from “0” to “1”. Add a bit’s decimal
value to toggle to “1” or subtract a bit’s decimal value to toggle to “0”. See table below.
Bit Definition:
Decimal Value to Write:
Add decimal values to lock multiples. Bold decimal number is the
example value to write to Lock object. Examples:
0: MODE button
1: DOWN button
2: UP button
3: FAN SPEED button
4: POWER On/Off button
5: SET (or ℃/℉) button
6: ESI contact detection
7: Door/Window contact
detection (unused)
(dec=1)
(dec=2)
(dec=4)
(dec=8)
(dec=16)
(dec=32)
(dec=64)
Unlock/enable all (0) – this will also enable ESI DI1 (add 64 to all
values below to maintain default occupancy selection over
BACnet).
Lock MODE button (1) Lock DOWN button (2)
Lock MODE & DOWN (3 = 1+2)
Lock UP button (4)
(unused)
8: Modification for communication
Lock MODE & DOWN & UP (7 = 1+2+4)
Lock FAN SPEED button (8)
parameters
i.e., baud rate, MAC addr, device inst.
9: Control DOs by thermostat algorithm
(dec=256)
(0) or BACnet sup. (1)
10~15: reserved/unused
(dec=512)
(unused)
Lock MODE & DOWN & UP & FAN (15 = 1+2+4+8)
Lock POWER button (16)
Bit Value:
Lock MODE & DOWN & UP & FAN & POWER (31 = 1+2+4+8+16)
Lock SET button (32)
0: Unlock / enable
1: Lock / disable
Lock MODE & DOWN & UP & FAN & POWER & SET (63 =
1+2+4+8+16+32)
ESI contact disable (64 – default). When the default value of 64 is
maintained, occupancy is set over BACnet and SET user button.
Lock MODE & DOWN & UP & FAN & POWER & SET & disable
ESI DI1 (127 = 1+2+4+8+16+32+64)
Door/Window contact detection (unused)
Lock the modification for communication parameters such as baud
rate and mac address (256)
Lock MODE & DOWN & UP & FAN & POWER & SET & disable
ESI DI1 & modification for communication parameters (383 =
1+2+4+8+16+32+64+256)
DOs control commanded by BACnet (512)
Page 21
UM-15093000-AA2
| General | Details |
|---|---|
| Name | CONTEMPORARY CONTROLS BAST-421C-B2 BACnet Communicating Thermostat User Manual |
| Make | CONTEMPORARY CONTROLS |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.65 MB |
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