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's MX Interface Connector (D Sub 15 HD) features
one
signal input
and
one signal output for switching loads
. In addition, the in-
terface also provides
two signal inputs and two signal outputs of the
RS232 interface
. You can use the camera's signal input/output pins to de-
tect 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
audio amplifier). This in turn opens new possibilities as the camera can feed exter-
nal 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
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D12 Camera Manual Part 1
Pin-out of MX Interface Connector D Sub 15 HD
Pin
5
Signal
GND
Alternative
Description
Ground
for RS232, USB, Backup V-In
Remarks
Audio
4
6
Line-In +
Line-In -
10
14
Line-Out +
Line-Out -
Audio input
, Line signal level U
RMS
=1V
Audio output
, Line signal level U
RMS
=1V
Galvanically isolated by
transformer (DC decoupled)
Galvanically isolated by
transformer (DC decoupled)
In/Out
USB
9
1
In 1
Out 1
13
11
USB +5V
USB D+
Serial interface
12
2
USB D-
RxD
3
TxD
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, in3V 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, in3V 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
