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SIGNAL-20P APPLICATION

5 APPLICATION

5.1 Preparation

5.1.1 Protective measures

There are no dangerous voltage circuits within the device.

The mounting and maintaining of the device shall be executed under

power–off conditions.

5.1.2 Device mounting

The device can be mounted to the wall or to other places on prem-

ises being protected from atmospheric fallouts and mechanical damages.

The installation procedure is as follows:

a) Attach the device to the wall in any convenient place. If the de-

vice is housed at unwatched premises place it at least 2,2 m

higher from the floor level

b) Attach the connecting wires in accordance with the connecting

diagram presented in Appendix C

c) Connect the isolating diodes for "К4" and "К5" outputs as close

to the visible or audible alarm terminals as possible. If these out-

puts are not in use stub its by 1 kОhm/0,25 W resistor

5.1.3 RS-485 interface wiring

To connect the device to the net controller via RS-485 highway inter-

face execute the following steps:

a) Connect the A and B lines of RS-485 highway interface to the "A"

and "B" terminals of device

b) Connect the device circuit "0B" to the similar circuits of preceding

and following RS-485 connected devices (it is not obligatory if the devices

are connected to the same power supply)

c) If the device is neither first nor last one into the interface line then

delete the jumper being located closely to the "A" and the "B" terminals of

the device and connecting the 620 Ohm terminal resistor to the interface

line.

When wiring the RS-485 interface it should connect the devices in se-

ries (into the bus configuration). If it is necessary to make long RS-485 in-

terface branch (longer than 50 m), for example, to reduce the cable length,

it is recommended to use the interface repeater S2000-PI. One can use no

more than 10 repeaters (no more than 10 interface branches) in one RS-

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