GE KTD-405, User Manual

Page: 16 / 76

KTD-405/KTD-405A Controller Keypad
User Manual
12
Twisted-pair connections
The twisted-pair connections are available to connect additional devices or for existing installations where
individual wires were used to connect to the old phone-style I/O box. Easy-to-use RJ-cable connections are
also available on the new I/O box. See
RJ-cable connections on page 11.
Adhere to all installation guidelines while making connections, including your local codes and those provided
in
Installation guidelines on page 8.
Figure 8. Wire connections to the I/O box
POWER 12 VDC
BIAS
SWITCH
78
9
10
6
5
3
2
14
RS485
A
B
A
B
+
AUDIO
KEYPAD
RS485
RS485
A
B
RS422 IN
RS422 OUT
SPEAKER SHIELD
SPEAKER
REMOVABLE TERMINAL STRIP
EARTH GROUND
7 8 9 10 6 5 3 2 1 4
RS485
A B A B +
A B
RS422
IN
RS422
OUT SP. SHIELD SPEAKER
Bias switch
The bias switch maintains an appropriate load on the RS-485 line. Set the bias switch to ON for one
keypad in a typical system (any one keypad and only one keypad). If your system is divided into
groups that are separated by fiber or Ethernet bridges, you must set the bias switch to ON for one
keypad in each group.
Tie-wrap
For safety, use a tie-wrap
to secure the power cable
to the tie-in.
Observe polarity for:
• 12 VDC
• RS-422
• RS-485
Earth ground (to ground)
RS-422 IN (from keypad or
alarm unit, if used)
Speaker/shield (to remote
speaker, if used)
* For mux, DVMRe, or additional keypad I/O box. (RS-485
connections are also available with the RJ45 connectors.)
RS-485 connection*
RS-422 OUT (to switcher
or cameras)
12 VDC power
(12 VDC transformer must
have a positive center
polarity plug
)