CRESTRON
CNTBLOCK
Network Terminal Block
R E M O T E C O N T R O L S Y S T E M S
3
DOC. 8055A
Specifications subject to change without notice.
Preparation for Use
Refer to figure 2 for typical hook-up diagrams of the CNTBLOCK. Complete the following steps in the order
provided to ensure proper installation of the unit.
NOTES
1. All CRESNET II network wiring should follow CRESTRON's network interconnection
drawing. Although the CNTBLOCK can help diagnose some wiring problems, certain
miswirings can cause damage to the CNTBLOCK or other network devices.
2. Network termination points are available at the control system power supply.
Network units may also be daisy-chained together. For additional wiring information,
refer to the latest revision of the CRESNET II reference manual section on CNPWS
power supplies (Doc. 8091).
3. CRESTRON recommends that a diagnostic procedure using the CNTBLOCK be used
before attaching new network devices.
1. Before making any connections, review latest revision of network interconnection drawing (Doc.
5411).
2. If using the CNTBLOCK with multiple power supplies, remove jumper as described in the Power
Isolation section.
3. Connect a network cable from one power supply to the CNTBLOCK.
4. Connect additional CRESNET II devices to the CNTBLOCK, one at a time. Ensure proper connect of
each device by observing CNTBLOCK LED illumination and referring to table 2.
5. If connecting multiple power supplies and the jumper has been removed, use a network cable to
connect the second power supply to the other side of the CNTBLOCK and repeat steps 3 and 4.
PROGRAMMING:
The CNTBLOCK does not require any specialized programming instructions.
FURTHER INQUIRIES:
If after reviewing this Operations Guide you still have additional questions, please contact a CRESTRON
technical support representative by dialing (888) CRESTRON [(888) 273-7876].
