e4595e5
11
Fire & Security Products
Siemens Building Technologies Group
05.2003
5.1 Bus overview
Field of application
Speed of
transmission
Length of line
Number of users
connected or
Number of wires
Type of cable
Loop line
T-branch
Network structure
Scanning
Principle
Special feature
Features
local system bus
twisted
–
Short-circuit proof
master/master
C-Bus
57kBaud
max. 1000m
(G51 ø0,8: 1400m)
...16
2
(+3 wires for
1)
yes
each user connected
with line separator
event-controlled,
presence monitoring
serial Bus
– Cerberus protocol
– collision detection
– Manchester coding
–
I-Bus
inside control unit
1000kBaud
max. 3m
(only inside cabinet)
...16
26
flat cable
–
–
–
master/slave
cyclic,
event controlled
– Cerberus protocol
– SPI/Motorola
C-Bus
–
D-Bus
interactive
for interactive detectors
4,8kBaud
AnalogPLUS-Bus collective line LON-Bus
see document e1508
...128
2
twisted
as required
yes
master/slave
– typ. all 3s
– interrupt on alarm
cyclic
– Cerberus protocol ’K51’
– serial 8bit
sensor/actor-Bus
detector parameter
download
–
–
– Cerberus protocol ’K31’
– serial 8bit
sensor/actor-Bus
– start-up: daisy-chain
– typ. all 64s
– interrupt on alarm
cyclic
master/slave
yes
via T-branch module
twisted
(un-twisted permissible)
2
2 messages/sec
for AnalogPLUS detectors for collective detectors
(direct current signal)
1 address
(max. 25 detectors)
2
twisted
–
–
no
master/slave
–
– current gain principle
– voltage levels
conventional
78kBaud
max. 500m
as free topology
max. 1000m
as stub line
2
twisted
–
no
local data bus
event-controlled
– Echelon Chip
network
–
for floor indicator panels
C-Bus devices
I-Bus modules
DBus devices (interactive)
...128
DBus devices (AnalogPLUS)
...32
LON-Bus devices
master/slave
(LON protocol)
– Cerberus specific
telegram
presence monitoring
(all 60s)
(max.50/150/250Ω/4µF)
(max.150Ω/300nF)
(max.120Ω/300nF)
Data Bus
–
local data bus
parallel ind. panel, synoptic
panel or relais
max. 1000m
...24
max. 8 addresses
6
(+ 3 wires supply)
twisted
–
yes
(see page 72)
serial bus
– Cerberus protocol
SPI-Bus 2KHz
–
master/slave
– typ. all 250ms
cyclic
addresses
emergency operation)
each user connected
with/without line separator
see document e1508
each user connected
with line separator
see document e1508
(un-twisted permissible)
1) calibrated according to cable impedance: 50W (MICC) / 110W (G51, ø0.8mm, not shielded)