GE Security
FHSD700C Series Product Guide
3.2.2 FHSD720C Connections
The FHSD720C detector provides interfaces as shown in Figure 3-7. Tables in
Connection Interfaces
on page 12 provide detailed connection information for:
24 VDC power supply.
Fault Relay contact connections.
Auxiliary 24 VDC output supply - fused to 1 A Fast-blow and can be used for powering an
external sounder, addressable I/O units etc.
Remote Reset input line - activated by applying 24 VDC.
RS485 Communications - used for operating the unit via a remote panel, or for connecting up to
30 detectors.
Ethernet connection - used for connecting to a host computer. The unit can be monitored and
driven remotely via GE Security VSC or VSM4 software.
RS232 connection - used for conducting Test/Configuration functions and interrogation of the
Fault Log Data when connected to a PC running configuration software.
1. RS232
2. Ethernet
3. Fuse
1A
4. I/O
Board
5. Output
Relay
Contacts
6. Optional I/O Modules
7. Programming
Connector
Figure 3-7: Diagram of the I/O board for the FHSD720C detector
FHSD720C units are powered by an external 24 VDC power supply.
Access to the interior of the unit is gained by removal of the front cover. This is secured by four screw
lock fixings (one at each of the four corners), releasing these fixings allows the removal of the cover
complete with the ‘self-retained’ fixings.
The Fault Relay and other I/O Module connections are all located on the (i602) printed circuit board
immediately on the front face of the internal metal sub-chassis.
The DC Supply fuse (FS1), TR5 style fuse 250V 2A Time Delay, is located on the (i602) printed circuit
board.
A cable entry gland is provided on the rear of the bottom casing for entry of the DC Supply Cabling and
the field wiring cables. This cable gland is fitted so as to provide strain relief. The power supply cable
cores should be fitted individually with ferrite cores, provided for the purpose, close to the cable gland
inside the detector case. The 24 V and 0 V conductors are fed through the ferrite core and wrapped
round once to provide maximum effectiveness.
A second cable entry hole is provided, fitted with 0.2 to 2 mm grommet, to facilitate the Ethernet cable
(if used).
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