Grounding And Shielding; Grounding For Host Interface - Bosch Access Modular Controller 2 Manual

18 en | Installing
4.6

Grounding and shielding

The main grounding point at the controller is connected to pin 2 of the power supply
connector.
For more information on these connections, refer to Connecting diagrams, page 45 .
It is good practice to shield all wires carrying low level signals.
The controller allows you to create a central ground or shielding point, simply by setting
certain jumpers. Set these jumpers only if grounding or shielding is not achieved by other
means.
Notice!
i
The functional earth ground symbol
electrical system in an electromagnetically compatible manner.
Notice!
i
Risk of malfunction
Ensure that no ground loops are formed.
Notice!
In general the following apply:
i
If the devices have their own power supplies, the shielding is applied to one side only. The
free end should be insulated to avoid inadvertent connections.
If one device is fed power by another, the cable shielding should be applied to both sides.
4.6.1

Grounding for host interface

A
Figure 4.5: Location of ground jumper RS-485 host interface
The internal ground of the controller is always connected with the ground of the RS485 host.
The jumper setting A1 shows the factory settings.
Jumper JP1 connects the internal ground of the controller to the ground of the RS-485 host
interface.
Jumper JP2 manages the signal ground.
Settings for jumper JP1:
If the ground conductor and the shield on the host are not connected and:
–
–
2022-11 | V04 |
A1 Delivery status
no party line exists, the jumper JP1 is set (= A2)
a party line exists, the jumper JP1 is set at the first device only (= A2)
identifies a functional part that allows installing an
A 1:
A 2:
JP1
JP2
JP1
A 3:
JP2
Guide d'installation
Access Modular Controller 2
Bosch Security Systems B.V.