ADR-7000 / SAVER-7000 / GUARD-7
© 2017
– Telefire Fire & Gas Detectors Ltd
Revision 0.98 October 2017
– Page 19 of 87 –
4.2.6 Cable Planning
– Remote Annunciators
RM-7000 remote annunciators are connected to the control panel via a four-wire
connection (two-wire, single-core RS-485 data cable, and two-wire, single-core 24Vdc
supply from either the control panel or an auxiliary power supply).
Cabling will be done as per the recommendation of RS-485 and local fire regulations
–
the more stringent of the two. Long distance cables or cables between buildings or
rooftops shall be shielded.
The cabling from the control panel to the remote panels is in linear (bus) topology.
Maximum total cable length (control panel to the last RM-7000) is 1,220 m.
The RS-485 standard does not specify cable characteristics. However, it is based on
the RS-422 standard, which recommends 24 AWG twisted pair cable with a shunt
capacitance of 16 pF per foot and 100 Ohm characteristic impedance. These
recommendations should be used for RS-485 systems as well.
Many available cables are designed specifically to meet the recommendations of
RS-422 and RS-485 specification. Another choice is the same cable commonly used in
the Shielded Twisted Pair Ethernet cabling. This cable, commonly referred to as STP
Category 5 cable, is defined by the EIA / TIA / ANSI 568 specification. The extremely
high volume of Category 5 cable used makes it widely available and very inexpensive,
often less than half the price of specialty RS-422 / 485 cabling. The cable has a typical
capacitance of 14.5pF/ft and characteristic impedance of 100 Ohms.
Maximum total cable length is 4,000’ (1,220m).
4.2.7 Cable Planning
– LON-7000 Galvanic Networks
It is possible to extend the ADR-7000's capacity by networking two or more (as many
as 32) control panels in a Master/Slave or Peer-to-Peer network.
In order to maximize the distance between ADR-7000 control panels interconnected in a
LonWorks network use a twisted pair cable of the types described in the following table.
The wires should enter the cabinet through the "
Power Limited
" wire entrances on
either the top right or bottom right of the ADR-7000 cabinet.
Wire Type
Belden
85102
Belden
8471
Level IV
22 AWG
JY (St) Y
2*2*0.8
Bus topology:
Maximum bus length (meters)
2,700
2,700
1,400
900
Free topology
Maximum node-to-node distance
(meters)
500
400
400
320
Free topology
Maximum wire length (meters)
500
500
500
500
Resistance (Ω/km)
15
28
55
73
Capacitance (nF/km)
56
72
56 (at 1 MHz)
98
Table 1
Maximum LON Cabling Length
Cabling topology can be bus, free, redundant ring, or a mixture of any two or all three
topologies.
i
Note
Redundant ring topology can be done only via fiber-optic cabling.
