Bosch PRS-1AIP1 Service Manual download pdf (Page 13)

No DHCP server is found

If no DHCP server is found then the built‑in IPzator function will search the network for a free

IP address. This can take up to 5 minutes.

If the IP address is not announced, check:

– If the green LED on the network port used (13 or 14) is ON. When OFF, check your

network cabling.

– The green status LED (2). When OFF, check the power supply cabling.

If the device still fails, revert to the factory default settings by pressing the reset button (1)

between 5 and 10 seconds while it is powered and repeat the previous steps 1 up to 4.

Audio Inputs 1/2

Connect the Audio Inputs 1 and 2 (11 and 10).

Both balanced Audio Input 1 and 2 are independent from each other, but will always be routed

together. Audio Input 1 is selectable between microphone and line level. If set to microphone

sensitivity, it can also do microphone presence supervision.

Audio Input 2 is a line level input. It can detect a 20 kHz pilot‑tone which is generated by the

connected audio source to supervise the connection.

Control Inputs

Connect the Control Inputs 1..8 (6 and 7) that are needed.

The Control Inputs 1..8 can be supervised (if configured). Two 10 kohm resistors have to be

added to each Control Input to enable supervision. The resistors should be mounted close to

the switch to make it possible for the device to supervise the cable between the switch and

the input connector. The input detects a 10 kohm resistance if the switch is closed and a

20 kohm resistance if the switch is open. This way shorted and open circuits are detected as a

fault situation. In case supervision is disabled for a Control Input, the resistors can be omitted

and the switch can be wired directly to the input connector.

10 k

Figure 4.1: Supervised Control Input contacts

Caution!

Do not connect a voltage or current source to the Control Input contacts.

Control Outputs

Connect the Control Outputs 1..8 (4 and 5) that are needed as described in Product view, page

4.5.1

4.6

4.7

4.8

IP Audio Interface Installation | en 13

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Bosch PRS-1AIP1 Service Manual Page 13