T1L Communication And Standard; Daisy Chain Topology; Ring Topology - Honeywell Unitary Installation Instructions Manual

T1L COMMUNICATION AND
STANDARD
The standard Ethernet, 4-wire solution has evolved into
a 2-wire solution known as 10BASE-T1L, consisting of a
single pair of twisted cables or single-pair Ethernet
(SPE).
10BASE-T1L offers the existing 2-wire infrastructure to
realize line lengths of up to 3280 feet (1000 m) at a
transmission speed of 10 Mbps.
The T1L communication protocol allows devices to
communicate on low-cost single twisted pair cable
within an IP network. It reduces the cost of the
installation of these devices. Through the Honeywell
T1L media adaptor, T1L networks can be connected to
main IP networks by converting one media type to
another. An RJ45 connector connects the 10BASE-T
network cable to a switch or host device, and a three way
screw terminal connects the downstream T1L devices
with the twisted pair cable. The two ports exchange data
packets in both directions. The adaptor does not require
an IP or MAC address and works out of the box with no
configuration.

Daisy Chain Topology

In traditional daisy chain topologies, if any of the
devices in the network fails, the devices that are
connected after that device, also fail. For example, if
there are 10 devices in a network, device number 1 is
the client device, which is connected to device 2, device
2 is connected to 3, and so on. If device 5 fails to
function, then devices from 6 to 10 also fail to
communicate with the client device.
The T1L ports include a protection for these scenarios
so that a device having a logic failure will not interrupt
the communication of others, for as long as the
Ethernet switch continues to be powered and running.
The maximum number of T1L controllers which can be
connected in a daisy chain is 100.
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T1L
Adapter
Fig. 27 T1L Daisy chain Topology
HONEYWELL UNITARY CONTROLLER - 230 VAC - INSTALLATION INSTRUCTIONS
T1L Daisy Chain Topology
#2
#1
#N
#4

Ring Topology

In case Unitary controllers are connected in a
redundant ring. In that case, you must have one
spanning tree protocol supported Ethernet switch as a
part of the ring. The Unitary controller supports an
Ethernet switch for 10/100 Mbps IP connection.
The switch will connect Unitary controller ring with the
IP network. The loop-free topology ensures that there
are not any broadcast storms or duplicate frame
transmissions.
The maximum number of T1L controllers which can be
connected in the STP loop is 39 with one switch.
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#3
29
T1L RSTP Ring Topology
#1 #2
T1L
Adapter Adapter
Multi Port (RSTP)
Ethernet Switch
Fig. 28 T1L Ring Topology
#3
T1L
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