Delta Controls
Document Edition 1.9
Page 5 of 12
Network Topology
1.
BACstats Configured as MS/TP Subnet Devices
With V3.21 firmware or higher, one possible MS/TP network architecture has the MS/TP devices configured as
Subnet devices, allowing BACstats to reside on the MS/TP network with other Subnet devices. Note that
V3.21 requires a DCU, while V3.22 or higher may use any System Controller instead.
2.
BACstats Configured as LINKnet Devices
The BACstat may reside on LINKnet instead of MS/TP. However, this requires a controller that supports a
LINKnet network for I/O expansion. The maximum LINKnet devices with or without I/O depends on the
controller.
DCU/DSC
(System Device)
BACnet (MS/TP) - Level 3 Network (Subnet)
DAC
(Subnet
Device)
TRM
DAC
(Subnet
Device)
TRM
Level 4
Network
(LINKnet)
!
16x16 Controller
!
12x12 Controller
!
12x8 Controller
!
6x6 Controller
!
Room Controller
!
VAV/VVT Controller
!
Lighting Controller
!
BACstat I
!
BACstat II
(with or without I/O)
!
Input Field Modules
Subnet Devices
!
DSC-1616EX [DCU]
!
DSC-1616(H/E)
!
DSC-1212(H/E)
!
DSC-1280(H/E)
!
DSC-T305
System Devices
RS-485
NET1
NET2
NET1
NET2
RS-232
!
BACstat I
!
BACstat II
(with No I/O)
!
BACstat II
(with muxed I/O)
!
I/O Field Modules
LINKnet Devices
TRM
Level 4
Network
(LINKnet)
DFM
DFM
TRM
LINKnet Notes:
1. Ensure you use the recommended
balanced cable.
2. Ensure the cable is installed as a
daisy-chain from one device to the
next. (1000' or 300m maximum).
3. Ensure you install MS/TP terminator
boards when you have more than 1 or
2 devices.
4. Depending on the controller, up to 12
devices are supported on a LINKnet
network, with limitations on how many
of these may have I/O. (Refer to
the Technical Reference Manual.)
ORCAview
OWS
DFM
Ethernet Note:
If the DCU or DSC has Ethernet capability, it may exist on an
Ethernet network with other controllers in the same building, on which
the ORCAview OWS could reside as well (instead of PTP).
PTP
MS/TP Notes:
1. Ensure you use the recommended balanced cable.
2. Ensure the cable is installed as a daisy-chain from one device to
the next (4,000' or 1220m maximum).
3. Ensure you install an MS/TP terminator board (TRM-768) on each
end of each MS/TP network.
4. The maximum nodes per MS/TP network is 50 without a repeater,
or up to 99 with at least one repeater (RPT-768).
Network Diagram
(with V3.22 Firmware)
