KTD-405/405A User Manual
Installation
1036547C / December 2003
15
3.3.5 C
ONNECTING
M
ULTIPLE
K
EYPADS WITH
STP C
ABLE
Adhere to all installation guidelines while making connections, including your local codes and those
provided in section
3.1 Installation Guidelines
.
12 VDC (observe polarity, if provided transformer and plug not used)
RS485 to I/O box of additional keypad via STP cable (with floating shield)
RS422 IN (data in from devices such as alarm units, ASCII converters, or keypads (see guidelines))
RS422 OUT (data out to devices such as domes, switchers, or keypads (other than KTD-405s))
AUDIO OUT (to speaker and speaker shield)
Observe polarity for:
•
Audio
•
RS422
•
RS485
•
12 VDC power
(12 VDC transformer
must have a positive
center polarity plug
)
RS485 OUT (data out to devices such as multiplexers or DVMRe’s; ground at mux/DVMRe)
Note:
When using STP for the RS485 connection between I/O boxes, you can use only one of the two
RJ45 RS485 OUT connections to a multiplexer or DVMRe. This ensures proper termination.
KEYPAD IN (RS422 and RS485 data in from keypad; RS422 data and power out to keypad)
AUDIO IN (from keypad)
PIN 1 to RS485 shield (ground one end only)
PIN 3 to RS485 A
Note:
When using
multiple keypads,
you can connect
CyberDomes and
other receivers to
the RS422 output
from any keypad.
PIN 6 to RS485 B
Note:
PINs 2, 4, 5, 7, and 8 are not connected.
Figure 12. KTD-405 and KTD-405A connections via STP cable
Содержание KTD-405
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