Basic modules

4DAV Line card for 4 digital stations in 2 wire technique

4DAV Line card for 4 digital stations in 2 wire technique

The audio frequency (AF) interface module is designed for the switching on of 4 call stations in two-wire technology.

At a Glance:

  • Digital robust transmission in two-wire technology
  • Switching-on of up to four call stations
  • Call station monitoring from the control unit
  • Monitoring of call station voltage
  • AF monitoring function (option)
  • Establishing long-distance lines
  • Sending/receiving level can be regulated

The principle functions of the 4DAV:

The 4DAV has four independent sets. One call station with one pair of wires can be connected to each set.

If the 25 W booster amplifier of a call station is activated or connected then additional power feeding is necessary. This can be done by two additional wires or by local feeding.

Each 4DAV line is secured both by a PTC and a fuse on the front panel. By spending an additional pair of wires, an additional call station amplifier can be fed in with 48V. This additional pair of wires is fused additionally on the circuit board. When releasing one of the fuses, a message will be sent towards CPU1 module. The “fuse” LED at the front panel will then show a typical blinking behaviour (see chapter “Symbols on the Front Panel”).

The functionality of the AF module can be programmed per set using the configuration software ICS. Control frames are sent bi-directional over the modem line cyclically between the 4DAV set and a call station (for example WPS-08, Ex). If a subscriber (call station) is absent then an error frame is sent to the CPU and sending / receiving LED is blinking slowly. This monitoring function can be disabled with the ICS.

This line card is suitable for fire protection system with application microphone monitoring system according to DIN EN 60849 (VPE0828).

Following audio bandwidths are selectable dynamically:

  • 3,5 kHz
  • 7 kHz

The mode of operation is set in the configuration software ICS:

  • Call station operation mode: One call station is expected as subscriber
  • Master operation mode: As counterpart a 4DAV as slave is expected
  • Slave operation mode: As counterpart a 4DAV as master is expected
  • No modem operation mode: The 4DAV only transmits AF signals

For this an audio signal is generated cyclically over the microphone of the call station and sent to the 4DAV. If the transmission of the AF signal fails, then an error message is generated.

This mode is activated by ticking the option in ICS.

The Symbols on the Front Panel and their Meaning:

The System Blinker The System Blinker Addressing from processor taking place
I/O Input/Output BUS output works as push-push operation with the system blinker BUS input works as push-pull operation with the system blinker

LED lit: 4DAV sending to subscriber
LED blinking: 4DAV receiving from subscriber
LED blinking slowly: modem connection disrupted
Fuses Fuses
LED on: Both fuses OK
LED flashing 1x: 2-wire fuse (front panel) defect
LED flashing 2x: 4-wire fuse (circuit board) defect
LED flashing 3x: Both fuses defect

Technical Data:

Operating Voltage: +/-5 V (control)
Operational Current (+5 V): 200 mA
Operational Current (-5 V): 4 mA
Temperature Range: 0°C — 45°C
Bandwidth: 3,5 kHz / 7kHz
Range: typ. 3 km by 0,8mm 2-wire connection (without additional amplifier)
Range: typ. 3 km by 0,8mm 4-wire connection (with an additional amplifier)
Weight: 300 g
Installation Height: 3HE
Installation Width: 6TE