ADLINK ND-6067 - Manual (Page 20)

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1.7 Constructing a NuDAM Network
Go through the following steps, the user can construct a NuDAM network easily.
1. Setup a ND-6520 or ND-6530.
2. Connect the host computer with the ND-6520 or ND-6530.
3. Setup one or more ND-6510 if necessary.
4. Connect the ND-6510 to extend to RS-485 bus if necessary.
5. Install the NuDAM utility software or ND-6530 driver from disk.
6. Initialize the brand-new NuDAM modules.
7. Add the new NuDAM modules into RS-485 network.
1.8 Termination Bus
In order to avoid signal reflections on the bus, each bus segment has to be
blanked off at its physical beginning and at its end with the characteristic
impedance. An termination resister ( Rt) is intalled for this purpose. The Rt value
- 120
Ω ± 2% is recommended, and the detailed connection of Rt can be referred
from the “Terminator Connection” diagram below.
Terminator Connection
Host
Data+
Data-
120 ohm s
Data+
Data-
120 ohm s
Figure 1-4 Terminator Connection