User`s manual

AXIS Q7404 - Unit connectors

The following connection diagram gives an example of how to connect an auxiliary device to the AXIS Q7404.

RS-485/RS-422 connector - For each video channel, AXIS Q7404 has two 2-pin terminal blocks for the RS-485/RS-422

serial interface used to control auxiliary equipment, e.g. PTZ devices.

The RS-485/RS-422 serial port can be configured in the following port modes:

• Bidirectional RS-485 half-duplex port for data transmission using two wires, one combined RX/TX

pair.

• Bidirectional RS-485 full-duplex port for data transmission using four wires, one RX pair and one

TX pair.

• Unidirectional RS-422 port for transmitting or receiving data using two wires, RX- or TX pair.

• Bidirectional RS-422 full-duplex port for data transmission (point-to-point) using four wires, one

RX pair and one TX pair.

Function Pin Notes

RS-485A alt RS-485/422RX(A) 1 RX pair for all modes (combined RX/TX for 2-wire RS-485)

RS-485B alt RS-485/422RX(B) 2

RS 485/422TX(A) 3 TX pair for RS-422 and 4-wire RS-485

RS 485/422TX(B) 4

E.g. push button

I/O congured as input

I/O congured as output

AXIS Q7404

3.3V

3.3V max 250mA

234

RX/TX