Connecting New And Old I/O Boxes - GE KTD-405 User Manual

16 KTD-405/KTD-405A Controller Keypad
User Manual

Connecting new and old I/O boxes

Adhere to all installation guidelines while making connections, including your local codes and those provided
in Installation guidelines
Note: For additional connection details about the old I/O boxes, see Appendix D. Old I/O Box Connections.
Figure 12. New to old I/O box connection
Observe polarity for:
• audio
• RS-422
• RS-485
• 12 VDC power. Transformer must have a
positive center-polarity plug
Note: When using multiple
keypads, you
can connect
CyberDom
es and
other
receivers to
the RS-422
output from
any keypad.
RS-485 shield (float)
A
12 VDC (no polarity on old I/O box)
B
RJ45 from keypad (RS-422 data in from keypad; silver
C
crossover cable for old I/O box)
RS-422 IN (data in from devices such as alarm units, ASCII
D
converters, or keypads (see guidelines))
RS-422 OUT (data out to devices such as domes, switchers,
E
or keypads (other than KTD-405s))
12 VDC (observe polarity on new I/O box)
F
RS-485 to I/O box of additional keypad
G
on page 8.
1 2 3 4 5 6 7 8
RS-485 OUT (data out to devices such as multiplexers or
H
DVMRes; ground at mux/DVMRe)
Note: When using STP for the RS-485 connection
between I/O boxes, you can use only one of the
two RJ45 RS-485 OUT connections to a
multiplexer or DVMRe. This ensures proper
termination.
KEYPAD IN (RS-422 and RS-485 data in from keypad; black
I
straight-through cable for new I/O box)
PIN 1 to RS-485 shield (ground one end only)
J
PIN 3 to RS-485 A
K
PIN 6 to RS-485 B (PINs 2, 4, 5, 7, and 8 are not connected.)
L
EARTH GROUND
A
RS485
B
A
RS422 IN
B
A
RS422 OUT
B
SPEAKER SHIELD
+
SPEAKER