KMC Controls KMD-5210, Installation And Operation Manual

Page: 16 / 38

KMC Controls
Revision E
Installation
EIA–485 networks
16
EIA–485 networks
The KMD-5210 LAN Controller provides four active EIA–485 connection
ports.
◆
Tier 1
◆
Tier 2A
◆
Tier 2 B
◆
EIA–485 for BACnet MS/TP
Use the Tier 1 port (marked Main Net on older controllers) to connect several
KMD-5210. This is an alternative to connecting LAN Controllers to each other
with Ethernet. This port will allow up to 31 controllers to be connected
together by network.
Note
The Tier 1 EIA–485 port is disabled when the controller is assigned an IP
address for operation on an Ethernet network. Tier 2 A and Tier 2 B will
function normally. Ethernet IP addresses are configured with
Hardware
Configuration manager .
The Tier 2 A and Tier 2 B ports are for connection to Tier 2 networks. Each port
supports up to 124 individual controllers.
Note
For reliable operation, use Belden cable model #82760 or equivalent (18 gauge,
twisted, shielded, 50 picofarads or less) for all EIA–485 network wiring.
Wiring notes
All EIA–485 network segments (KMC protocol or BACnet) use the same
wiring principles.
◆ Use approved shielded cable and the following principles when
connecting a controller to a Tier 2 (sub LAN) network:
◆ Connect no more than 31 KMC addressable controllers or devices to the
Tier 1 RS-485 connector.
◆ Connect no more than 124 KMC programmable controllers to the
Tier 2 A or Tier 2 B connectors.
◆ Connect the
A
terminal in parallel with all other
A
terminals.
◆
Connect the
B
terminal in parallel with all other
B
terminals.
◆ Connect the shields of the cable together at each controller.
◆
Connect the shields to an earth ground (if available) or chassis ground
only at one end of the segment; tape back the shield ground at the other
end.
◆ Use a KMD–5575 repeater between every 32 Tier 2 controllers or if the
cable length of a Tier 1 or Tier 2 network exceeds 4000 feet (1220 meters).
Use no more than seven repeaters per network.
◆
Place a KMD–5567 surge suppressor in the cable where it exits a
building.