Connecting Multiple Keypads With Stp Cable - GE KTD-405 User Manual

16 KTD-405/KTD-405A/KTD-405-2D Controller Keypad
User Manual

Connecting multiple keypads with STP cable

Adhere to all installation guidelines while making connections, including your local codes and those provided
in Installation guidelines
Figure 11. KTD-405 and KTD-405A connections via STP cables
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 CyberDomes and other receivers to
the RS-422 output from any keypad.Only one
RS communication can be chained together,
if both are hooked up on 405 I/O boxes then
performance will degrade or it will not work
at all.
12 VDC (observe polarity, if provided transformer and plug not used)
A
RS-485 to I/O box of additional keypad via STP cable (with floating shield)
B
RS-422 IN (data in from devices such as alarm units, ASCII converters, or keypads (see guidelines))
C
RS-422 OUT (data out to devices such as domes, switchers, other keypads (not KTD-405s))
D
AUDIO OUT (to speaker and speaker shield)
E
RS-485 OUT (data out to devices such as multiplexers or DVMRe's; ground at mux/DVMRe)
F
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; RS-422 data and power out to keypad)
G
AUDIO IN (from keypad)
H
PIN 1 to RS-485 shield (ground one end only)
I
PIN 3 to RS-485 A
J
PIN 6 to RS-485 B (PINs 2, 4, 5, 7, and 8 are not connected.)
K
on page 8
EARTH GROUND
A
RS485
B
A
RS422 IN
B
A
RS422 OUT
B
SPEAKER SHIELD
+
SPEAKER
1 2 3 4 5 6 7 8
EARTH GROUND
A
RS485
B
A
RS422 IN
B
A
RS422 OUT
B
SPEAKER SHIELD
+
SPEAKER