Access Door Module ADM-2W704 (Rev 1.3) Installation & Application Guide
Page 22 of 26 Access Door Module
LINKNET NETWORK & CABLING REQUIREMENTS
To ensure network stability and reliable communications, particularly at high speeds on the LINKnet network for a
number of devices, it is imperative that you adhere to the following network and cabling requirements:
Item Description
Cabling
For MS/TP and LINKnet networks it is recommended that you use network cabling that
matches the following specifications:
• Balanced 100 to 120 Ohm nominal impedance Twisted Shielded Pair (TSP) Cable
• Nominal capacitance of 16 PF/FT or lower
• Nominal velocity of propagation of 66% or higher
Topology Ensure the cable is installed as a daisy chain from one device to the next.
Max. Controllers
(Access Door
Modules)
The maximum number of controllers per LINKnet network is 12.
Termination
Boards
A termination board (TRM-768) must be installed at each end of each MS/TP network
segment – or two per MS/TP or LINKnet network. Ensure you do not overlook this in
laying out your network architecture and ordering product.
The LINKnet network must be connected to NET1 of the Access Door Module. When connecting the LINKnet
network to the Access System Manager it must be connected to NET1 and configured properly in the Access
System Manager for the Access Door Module to communicate on LINKnet.
For more detailed information, including wiring, refer to the RS-485 Network Installation Guide (DOC818-11).
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