System Integration; Connecting Vk-3 Keyboards - Siemens VIS3I-328 Installation Manual

9

System integration

9.1

Connecting VK-3 keyboards

28
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Fire Safety & Security Products
You can connect a total of sixteen keyboards to the keyboard serial port of a VIS3I-
328, using a single RS-485 cable 'daisy-chained' between multiple keyboards.
For a single keyboard, keyboard power is drawn from the VIS3I-328. For more than
one keyboard, you need to use a local 12 V DC power supply for each keyboard.
Do not connect a keyboard to a dc power supply as well as wiring to the 12 V
CAUTION
keyboard connector supply, or damage may occur.
RS-485 cable wiring is as follows.
NOTE
The cable screen is grounded at the VIS3I-328 connector shell, and is only linked to the next cable
screen at each keyboard connector.
VIS3I-328 Cable
Keyboard Port
Shell Screen
Pin 1 (+12 V) Twisted
pair
Pin 6 (0 V)
Pin 2 (+12 V) Twisted
pair
Pin 7 (0 V)
Pin 5 (data -) Twisted
pair
Pin 9 (data +)
RS-485 keyboard cable wiring
Tab. 7
In cases where you need to connect a keyboard via a fibre link, or through some
other device where the short (less than 3 ms) line turnaround requirement of the
Molynx protocol is a problem, you can connect a single keyboard using an RS-422
cable as follows. (The +12 V and 0 V connections are not required if the keyboard
has its own DC power supply.)
VIS3I-328 Cable
Keyboard Port
Shell Screen
Pin 1 (+12 V) Twisted
pair
Pin 6 (0 V)
Pin 2 (+12 V) Twisted
pair
Pin 7 (0 V)
Twisted
Pin 4 (data T-)
pair
Pin 8 (data T+)
Pin 5 (data R-) Twisted
pair
Pin 9 (data R+)
RS-422 keyboard cable wiring
Tab. 8
For more details of keyboard cabling, refer to the Keyboard User Manual.
Keyboard 1 Cable
RS-422/485 ports
Not connected Screen
Pin 1 (+12 V)
Pin 6 (0 V)
Pin 2 (+12 V)
Pin 7 (0 V)
Pin 5 (data -) Twisted
pair
Pin 9 (data +)
Keyboard 1 RS-422/485
port
Not connected
Pin 1 (+12 V)
Pin 6 (0 V)
Pin 2 (+12 V)
Pin 7 (0 V)
Pin 5 (data R-)
Pin 9 (data R+)
Pin 4 (data T-)
Pin 8 (data T+)
Keyboard 2 to 16
RS-422/485 ports
Not connected
Not connected
Not connected
Not connected
Not connected
Pin 5 (data -)
Pin 9 (data +)
10.2008