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Before configuring the system
14
Before configuring the system
Before commissioning the SiPass Entro system, the installer should read and
complete the checklist [ 75] .
14.1 Check the communication circuits
Go to all units in the system and check that they are communicating.
When all units are connected (but with all removable terminal blocks disconnected
in drop boxes and door controllers), check on reader block nos. 3 and 4 in drop
boxes, door controllers and segment controllers that the resistance on the global
and the local communication circuit respectively, is 60 Ω (ohm) plus the cable
resistance.

If the resistance is 120 Ω plus the cable resistance, one termination resistor is
missing. If the resistance is much less than 60 Ω, there is a short circuit in the
communications circuit.

If the resistance is much greater than 120 Ω (open circuit), there is a break in
the circuit or the termination is missing in both ends.
If using a LAN, check that all cables are correctly connected to the LAN.
14.2 Check the power supply
Connect the power supplies. Check that the voltage is approximately that of the
power supply output and that + and – are in the right positions.
Remember that a voltage drop (between the highest and lowest potential) larger
than 5V between units may influence the quality of the RS485 communication.
74
Building Technologies
Fire Safety & Security Products
020_SiPass_Entro_6_5_A24205-A335-B317_e_en
10.03.2010