User`s manual

47
AXIS Q7401 - Unit connectors
The following connection diagram gives an example of how to connect an auxiliary device to the AXIS Q7401.
RS-422/RS-485 connector - Two 2-pin terminal blocks for RS-485/422 serial interface used to control auxiliary equipment,
e.g. PTZ devices.
The RS-485/422 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 number Notes Specifications
GND 1 Ground
12VDC Power 2 Can be used to power auxiliary equipment.
Notes:
This pin can only be used as power out.
Same voltage as pin 2 of the power connector.
Max load = 100mA
Configurable
(Input or Out
-
put)
3 - 6 Digital input - Connect to GND to activate, or leave floating (or uncon-
nected) to deactivate.
Min input = - 40V DC
Max input = + 40V DC
Digital output - Uses an open-drain NFET transistor with the source
connected to GND. If used with an external relay, a diode must be con
-
nected in parallel with the load, for protection against voltage tran-
sients.
Max load = 100mA
Max voltage = + 40V DC
Function Pin Notes
RS 485/422TX(A) 1 TX pair for RS-422 and 4-wire RS-485
RS 485/422TX(B) 2
RS-485A alt RS-485/422RX(A) 3 RX pair for all modes (combined RX/TX for 2-wire RS-485)
RS-485B alt RS-485/422RX(B) 4
1
2
E.g. push button
I/O 3 configured as input
I/O 4 configured as output
* Note: Same voltage as pin 2 of the power connector
AXIS Q7401
3.3V
*12V max 100mA
D
S
G
1
234
TX
RX/TX