Installation
KTD-405/405A User Manual
8
1036547C / December 2003
3
I
NSTALLATION
CAUTION:
Plan your system’s camera and device assignments before installing the system. To help plan
your system, refer to
Appendix E. System Planning Guide
.
Note:
The keypads now ship with an updated I/O box that provides RJ45 ports for the RS485 data line and an RJ11 port for audio.
See section
3.3.
6
Connecting New and Old I/O Boxes
for connections between the new and old I/O boxes. For connection details
about the old I/O boxes, see
Appendix D. Old I/O Box Connections
.
3.1 I
NSTALLATION
G
UIDELINES
Installation Guidelines
•
Recommended cable types:
Signal
Cable
Minimum Size
RS485
STP (shielded twisted-pair)
22 AWG
RS422
UTP (unshielded twisted-pair)
22 AWG
Audio
STP (shielded twisted-pair)
18 AWG
Note:
Refer to device manuals for specific cabling requirements.
•
Each keypad requires its own I/O box. You can connect multiple I/O boxes to each other to establish multiple
keypads for controlling one system. For systems that are more complicated than are diagrammed in these
instructions, contact GE Interlogix Technical Support for assistance.
•
The audio and speaker connections are used only with a KTD-405A.
•
Observe polarity when installing the RS422, RS485, and 12 VDC (if not using the provided transformer with
positive polarity center plug) cables.
•
The earth grounds for the I/O boxes are separate from the earth grounds for the RS485 shield.
•
The keypad itself is not grounded.
•
Grounding the I/O box is optional, but it does provide some additional protection against equipment damage
due to electrical storm induced power surges.
•
There must be no current flowing in the shield of shielded cables. Maintain an open circuit (non-continuous
path) for the shield and hold it at the earth ground potential by grounding it at only one location.
•
You can connect the RS485 shield of individual cable segments to each other, but to nothing else. You will
still ground the resulting shield circuit at one location only, despite the number of shield junctions.
•
Each electrical circuit (RS485 segment) must be biased. If keypads reside on separate electrical circuits
(i.e., separated by fiber or Ethernet bridges), then more than one keypad might have the bias switch set to
ON (one for each circuit).
•
The bias is 12-VDC polarity sensitive. If polarity on the power line is reversed, the keypad will not be
damaged but it will not operate correctly.
•
Each electrical segment being terminated must be terminated at each end, and at one location for the bias.
Termination is generally required for the first and last device on a longer line. The termination switches are
located within or on the devices themselves (e.g., keypads and cameras). Refer to device manuals for
termination requirements and methods.
•
Your system should contain only one RS422 chain of devices. Only one KTD-405 keypad should be in that
chain, which can contain any number of other keypads such as KTD-404s.
Summary of Contents for KTD-405
Page 1: ...KTD 405 and KTD 405A Controller Keypads ...
Page 60: ......