Document Edition 2.8
Network Communication
The controller communicates on Twisted Pair Ethernet 10-BaseT using BACnet IP and BACnet over Ethernet,
or on an RS-485 LAN using the BACnet MS/TP protocol. Refer to Delta Controls Wiring Guidelines for further
details.
MS/TP (RS485) Wiring
For detailed information on MS/TP and LINKnet wiring refer to Delta Controls Wiring Guidelines.
The proper specified cabling must be used to ensure reliable communications. (22-24 AWG
twisted pair, 100-120 ohms impedance, 17 pF/ft or lower capacitance, with a braided or aluminum
foil shield.)
Controllers should always be wired together in a daisy-chain fashion. Attempting to connect them
using a starred or bus configuration will cause problems on the network.
Networks with a total length greater than 4000 ft or with more than 50 controllers require a
repeater (RPT-768).
LINKnet networks that have only 1-2 controllers, and have less then 100 ft of cable length do not
require network terminators.
Input and Output Wiring
Inputs and outputs on the DSC-1280 controller follow the same general wiring connection diagrams as other
Delta Controls products. Refer to separate documentation for additional details.
Input Configuration
The input must be configured to accept the signal used by
the input device. Place the jumper for each input in the
correct location on the Input Type Selector Block. The
diagram to the right shows the factory default selection of
10 KΩ.
4-20mA For sensors that use a 4 to 20 mA signal.
10K For 10 KΩ Thermistor temperature
sensors, as well as Dry Contact binary
inputs.
5V For sensors that use a 0 - 5 VDC signal.
10V For sensors that use a 0 -10 VDC signal.
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