3.7 Connecting External Devices and Sensors: MX Interface Con-
nector and MOBOTIX Cam-IO
3.7.1 MX Interface Connector for Direct Connections
The MOBOTIX camera has one signal input and one signal output for
switching loads as well as two signal inputs and two signal outputs of
the RS232 interface on the MX Interface Connector (D Sub 15 HD). You can
use the camera's signal input/output pins to detect an opening door (using
a Reed switch) or to switch an external device (e.g. a lamp).
The interface connector also has Line In/Out pins for external audio devices. You
can use the Line In pin to have the camera transmit and record external audio sig-
nals (e.g. from an external microphone with pre-amplifier). On the other hand, the
camera can use the Line Out pin to transmit sound to external devices (e.g. an au-
dio amplifier). This in turn opens new possibilities as the camera can feed external
loudspeakers (such as announcement systems on a train station) or it can use
external and more sensitive microphones that can be placed farther away from the
© MOBOTIX AG • Security-Vision-Systems • Made in Germany
86/96
D12 Camera Manual Part 1
Pin-out of MX Interface Connector D Sub 15 HD
Pin
5
Signal
GND
lternative Description
Ground for RS232, USB, Backup V-In
Remarks
Audio
4
6
Line-In +
Line-In -
10
14
Line-Out +
Line-Out -
udio input, Line signal level U
RMS
=1V
udio output, Line signal level U
RMS
=1V
Galvanically isolated by
transformer (DC decoupled)
Galvanically isolated by
transformer (DC decoupled)
In/OutUSB
9
1
In 1
Out 1
13
11
USB +5V
USB D+
Serial interface
12
2
USB D-
RxD
3TxD
Signal input, active < 0,5V, inactive > +3V,max. voltage=24V
Signal output, OpenCollector, active vs. GND, max. 24V/
50mA, inactive 10kOhms vs. 3.3V
Power supply for USB devices 5V/100mA vs. GND
USB master data signals, 0V to 3.3V
With backup power (12V) or PoE,
500mA also possible
RxD RS232 active = -3V to -12V, inactive = +3V to +12V
RxD I/O
TxD RS232
Signal input, inactive: open or voltage > 3V,
active: GND or voltage < 0V, max. ±12V
active = -3V to -12V, inactive = +3V to +12V
7 RTS
8 CTS
15 Backup V-In
TxD I/O
RTS RS232
Signal output, inactive: < 3V max. 3mA,
active: > +3V max. 3mA, max. voltage ±12V
active = +3V to +12V, inactive = -3V to -12V
RTS I/O
CTS RS232
Signal output, inactive: < 3V max. 3mA,
active: > +3V max. 3mA, max. voltage ±12V
active = +3V to +12V, inactive = -3V to -12V
While the system boots, the signal
state is undefined
While the system boots, the signal
state is undefined
CTS I/O Signal input, inactive: open or voltage > 3V,
active: GND or voltage < 0V, max. ±12V
Backup power 6V to 12V vs. GND, max. 1A
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