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VCES-DDC-IOM-1C

Maximum Number of Devices

A maximum of 32 nodes are allowed on a single daisy

chain segment. A node is deﬁned as any device (Panel,

Zone, Repeater, etc.) connected to the RS485 network.

Terminators do not count as a node. Figure C3 shows an

example of a system with 5 nodes.

Termination

Both ends of a daisy chain segment require termination

to ensure reliable operation. After the last device on each

end of an RS485 network, install a DNT294 Network Ter-

minator. The DNT294 (shown in Figure C5 below) provides

the correct termination for not only the network, but

proper termination of the shield as well.

Shielding and Grounding

Figure C6 shows preferred shielding and grounding methods.

Unit Addressing

The BacNet address of a unit is sent out as address 1 from

the factory. This address can be adjusted by setting the dip

switches located on the DSC-1180 controller. See Figure

C7.

−−

−

RS485

port

Figure C3: Proper connection in the middle of a daisy chain

Terminator does not

count as a node

Node #2

Node #4

Node #3

Node #5

Node #1

erminator does not

count as a node

Panel

Legend

Zone/micro/DAC

controller, etc.

Terminator

Figure C4: Five node network example

−

RS485

port

RS485 network

terminator

GNDP1

Network continues...

Shunt

Shield

Remove shunt jumper if shield is grounded

directly at any other point, or shunt is

installed at other end of network.

DNT294 Rev 1.1

Delta © 04/00

Figure C5: DNT294 network terminator

IMPORTANT

Note that DNT294 Network Terminators are not provided

by Venmar CES.

CAUTION

Failure to follow these recommendations may result in un-

desirable and unpredictable effects on unit functionalities.

Venmar CES will not take responsibility for issues resulting

from improper controls and/or networking practices.

−

−+

RS485

port

RS485 network

terminator

GND

Shunt

Shield

Remove shunt jumper if shield is grounded

directly at any other point, or shunt is

installed at other end of network.

DNT294 Rev 1.1

Delta © 04/00

RS485 network

terminator

GNDP1

Shunt

Shield

Remove shunt jumper if shield is grounded

directly at any other point, or shunt is

installed at other end of network.

DNT294 Rev 1.1

Delta © 04/00

−+

RS485

port

−+

RS485

port

−

RS485

port

Remove shunt on both ends,

allowing shield to go to ground

through 180V MOV

Remove shunt on both ends,

allowing shield to go to

ground through 180V MOV

Ground shield in

middle of segment

Shield

Solidly ground

each terminal

Figure C6: BacNet address jumpers

BacNet

address

jumpers

Figure C7: BacNet address jumpers

1 2 ... 15 16 17 18 19 20 21 22 23 24

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