BB-HCM515CE - Panasonic Video Monitoring Service Manual (repair manual). Page 21

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You can connect an external microphone and external speaker to the camera to use the Listen and Talk features, respectively. For information about these 
features, see 1.2.9 Audio Features in the Operating Instructions on the CD-ROM. Connect the devices as shown below.

You can connect a TV or other video device (NTSC or PAL format) to the camera to monitor or record camera images. Connect the video device as shown 
below.

The camera’s external I/O interface allows you to connect 2 devices (such as sensors, motion detectors, etc.) that can be used to trigger the camera’s image 
buffering and transferring features (see Section 2 Using Triggers to Buffer and Transfer Images in the Operating Instructions on the CD-ROM).
The external I/O interface has 6 terminals.

• If you use an external microphone, excessive cable length or a poor 

quality cable can cause degradation in audio quality.

• The microphone cable should be no longer than 7 m.
• Use a speaker with a built-in amplifier. The speaker connects to the 

camera with a stereo audio cable similar to that used by your PC. The 
output signal is mono.

• Make sure the camera and speaker are turned off when connecting or 

disconnecting the speaker cable, otherwise noise may be heard from 
the speaker.

• The external microphone input does not correspond to a line level. 

Audio may be distorted when the line level is input. Audio distortion will 
be solved if you insert the following circuits. Under no circumstance 
should high-level audio, such as from a speaker, be connected to this 
input terminal. Doing so is likely to damage the camera.

• Analog video output is disabled by default. See 7.5 Controlling the 

Analog Video Output Signal in the Operating Instructions on the CD-
ROM for more information.

• The external I/O interface is not capable of connecting directly to 

devices that require large amounts of current. In some cases, a custom 
interface circuit (customer-provided) may have to be used. Serious 
damage to the camera may result if a device that exceeds its electrical 
capability is connected to the external I/O interface.

• Low voltage/current circuits and high voltage/current circuits are used 

in the camera circuit. All wiring should be performed by a qualified 
electrician. Incorrect wiring could damage the camera and cause a fatal 
electric shock.

GND terminal.

External sensor input 1. The camera can be triggered by either an open 
circuit or a GND short-circuit.

GND terminal.

External sensor input 2. The camera can be triggered by either an open 
circuit or a GND short-circuit.

External device control output. Allows you to control an external device 
using the output buttons in the camera’s operation bar (for example, 
turning a light on or off).

• This terminal’s behavior can be changed (see 7.4 Controlling the 

External Output Terminal in the Operating Instructions on the CD-
ROM).

• This terminal is an open collector circuit. The maximum drawing 

current is the same as terminal 4. Do not exceed the voltage of the 
terminal 4.

DC power output terminal.

• 10.5–13 V DC
• Maximum load drive is 100 mA.

• Do not push strongly on the external I/O interface with the pointed object. 

The external I/O interface may get stuck into the unit, and you may not be 
able to use it. 

To microphone

For speaker
(Output impedance 
560   line level)

For microphone
(Plug-in power +3.3 V)

Microphone cable
(  3.5 mm plug)

Speaker cable
(  3.5 mm stereo 
plug)

To speaker

Microphone Input

Audio Line 
Out

Capacitor

Resistor

1   F

33 K

For video device

To video device

 Video cable
(  3.5 mm plug)

External I/O interface

Light

Door Sensor 1 (Alarm 1)

Door Sensor 2 (Alarm 2)

Relay

Camera

12 V*

2

3

4

G

1

G

*DC 10.5 V–13 V