Document Edition 1.3
Page 7 of 12
Network Communication
The controller communicates on Delta Controls LINKnet network through the Service Tool Port or an RS-485
connection.
MS/TP (RS485) Wiring
For detailed information on 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.
When using this product special consideration must taken into how the product is installed. The following are
guidelines on how to apply this product.
The DRP-T0B must be connected to a DSC controller. The DAC controllers do not have enough
memory to support the functionality required.
The DRP-T0B communicates only on LINKnet.
The Service Tool Port on all controllers (except the DLC) is internally connected to NET1. This
means that if you want to connect the controller to NET2 the supplied Service Tool Cable cannot
be used. The controller must be hardwired with the connections in the back on the controller.
If using an Ethernet DSC the DRP-T0B can be connected to the DSC with the supplied Service
Tool Cable.
If using a non Ethernet DSC that is networked, the DRP-T0B must be connected using the
connections on the back of the controller.
The following diagram shows the network configuration when using an Ethernet DSC.
