User manual

3.6 Connecting External Devices and Sensors: MX Interface Con-
nector
3.6.1 MX Interface Connector for Direct Connections
MOBOTIX M12, D12 and V12 cameras have an MX Interface Connector (D Sub
15 HD), which features one signal input and one signal output for switch-
ing loads. In addition, the interface also provides two signal inputs and
two signal outputs. You can use these signal input/output pins to detect an
opening door (using e.g. a Reed switch) or to switch an external device (e.g. a
lamp) via a relay. 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 signals (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 audio 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 camera (e.g. when using a MOBOTIX camera as a video conferenc-
ing system and in access control scenarios).
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D12 Camera Manual Part 1
Pin-Out of MX Interface Connector D Sub 15 HD
Pin
5
Signal
GND
A
lternative Description
Ground for RS232, USB, Backup V-In
Remarks
Audio
4
6
Line-In +
Line-In -
10
14
Line-Out +
Line-Out -
A
udio input, Line signal level U
RMS
=1V
A
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