Delta Controls
Document Edition 2.3
Page 11 of 13
Network Topology (Only RTS-20Jxx)
Room Temperature Sensors with a Service Port may be connected to a BACnet RS-485
MS/TP network or to the LINKnet network. Note that this does not make the RTS-20Jxx a
MS/TP or LINKnet device, it simply adds a connection point to the network for use with
the Service Tool.
Network Communications Setup (Only RTS-20Jxx)
The communication speed is set on the network controllers. Refer to the
V3.30 ORCAview
Technical Reference Manual
for further detail on configuring the MS/TP network or
changing baud rates, etc.
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)
RTS
RTS
RTS
* Note
: The RTS is NOT a
network sensor it is connected
to the network to provide
Service Port Access
