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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 devices require a repeater
(RPT-768).
LINKnet networks that have only 1-2 devices, and have less then 100 ft of cable length do not
require network terminators.
Input and Output Wiring
Inputs and outputs on the DFC-304R3-240 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.
DFC-304R3 Rev 2.1 Installation Guide.doc
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