MODEL 3000 / ACCESS 4000. CE Installation Notes.
12
CONNECTING MODULES TO THE LAN. Refer to diagram opposite.
- “A” & “B” signal connections are wired in parallel across the system using TWISTED PAIR cable. ¶
See “Cable Types” details on page 12.
The “NEG” connection (0V reference) must also be wired to every module. ·
- An optional + 12 V connection (LAN +ve) may be used to provide power to modules that do not have their own on-board
power supply. e.g. LCD Terminals. ¸
- The + 12 V connection (LAN +ve) used to power LCD Terminals, etc. can be derived from any module with it’s own on-
board power supply (Control Module and Expander Modules), or from a separate external power supply. ¹
CAUTION ! Never connect the +ve (POS) of two power supply sources together. i.e. Control Module LAN POS, Expander
Module LAN POS, or External Power Supply +ve. This is one of the reasons that “SPARE” wiring terminals are provided on
most types of modules.
- When wiring the LAN to modules that are powered from their own on-board power supply (e.g. Zone Expanders), use the
“Spare” terminal (labelled “SPARE” or “SPR”) for the LAN +ve connection. º
NOTE: LAN “POS” and “NEG” should not be used to power detectors, relays, etc. Always use “DET+” and “DET-” on the
module to power these devices.
- When wiring the LAN to modules that are powered from an external Power Supply (e.g. Reader Modules), use the “Spare”
terminal (labelled “SPARE” or “SPR”) for the LAN +ve connection. »
- A DC Voltmeter may be used to check that the LAN will operate reliably. See “LAN Voltage Testing” on Page 18.
LAN SYSTEM OVERVIEW
The 3000/Access 4000 LAN (Local Area Network) is a 3 or 4 wire network used to connect the modules in a system. Up to 250
modules can be connected on the LAN system, comprising up to 99 modules of any particular type. (Depending on Memory size &
configuration) Using recommended cable types, modules on the LAN can be installed hundreds of metres from the Control Module.
Data encryption ensures secure LAN communications at all times, while the programmable supervisory polling system continuously
monitors the network to detect cable tamper, cable fault conditions, module off-line and module substitution. The data format used
in the 3000/Access 4000 LAN has been developed to ensure fast, reliable communications regardless of the size of the system.
For larger systems and complex sites, LAN Isolators can provide opto-isolation between sections of the LAN, eliminate potential
earth loop problems, improve surge protection, provide signal level restoral for improved performance over longer cabling distances
and offer a monitored “loop” LAN wiring option for a higher level of LAN integrity.
SYSTEM EARTHING
- The System Ground is connected to Mains Earth via the Power cord at the Control Module. The enclosure can be mounted on
a grounded conductive surface, providing a secondary ground connection.
- In some cases a Printer, PC, modem, etc. connected to the Control Module UART board may also provide a connection to
earth via the peripheral device. If so, ensure that the peripheral device is powered from the same AC Mains circuit or the
RS232 Serial connection is isolated.
- The Intelligent 4 Door Access Module also has local Ground connected to Mains Earth via it’s Power cord, however, the
System LAN connection (X1 “ISO LAN”) is isolated to eliminate Earth loops. Ensure that there are no other 0V or Ground
connections between the Control Module and Intelligent 4 Door Access Modules.
- While the metal chassis of Modules with on-board power supply such as Universal Expanders is connected to Mains Earth,
the PCB circuitry is isolated from the chassis. Ensure that wiring, additional hardware or peripherals connected to these
modules does NOT provide an Earth connection to the Module PCB.
- Ensure that all other Modules (with no on-board Power supply) have NO local connection to Earth.
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