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--- Category [External_IO]: 7 hit ---
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No.1 What are absolute maximum ratings and electrical specifications of the External I/O ? [External_IO]
|Answer...||Refer to the following tables.
|Answer...||Yes, an external light can be switched on and off remotely by using a relay. The Network Camera's external digital device circuitry is designed to allow a relay to be connected, and the collector signal from the NPN transistor is output as is. |
When interfacing with external devices, refer to the notes below.
Click here for details of the electrical specifications of each Network Camera.
* Caution 1:
The maximum electrical current that can be applied to the digital output terminal of Network Cameras KX-HCM10 and KX-HCM8 is 50mA.
The maximum electrical current that can be applied to the digital output terminal of Network Cameras KX-HCM230, KX-HCM250, KX-HCM270, and KX-HCM280 is 100mA.
Select the appropriate relay and external resistor for the recommended rated current/voltage of relay and the resistance value of the coil.
(Example selection of electrical components for KX-HCM10)
• Specification of the relay
Rated voltage E1 = 6V
Rated current I1 = 33.3mA
Resistance of relay-coil R1 = 180 ohms
• Example of calculation for the value of external resistor R2
R2> Vcc/I1 - R1 = 10V / 33.3 mA - 180 ohms = 120 ohms and over.
PR2 = I1xI1xR2 = (33.3mA)X(33.3mA) x 120ohms = 0.13W and over.
Therefore, an external resistor of 120 ohms and 0.5W should be connected.
* Caution 2:
Consider the maximum allowable voltage of the relay. As input voltage applied to the relay (voltage of DC Power Output Terminal) varies, make sure voltage applied to the relay does not exceed its ratings.
* Caution 3: (Figure A)
If the voltage applied to the relay exceeds its rating, components within the Network Camera may be damaged.
* Caution 4: (Figure B)
If the rated current of the relay currently used exceeds 50 mA, you need to establish an extra external relay drive circuit as shown below.
Please take extra care when you establish a relay drive circuit.
When you connect a relay circuit only to pin No.4 of External I/O, the external power source may reverse and be routed to inside the Network Camera, causing instability or damage to the Network Camera or its components.
* Caution 6: (Figure C)
When connecting the external devices to Network Camera using other components instead of a relay, connect an external pull-up resistor as shown below when the control input is logic input. In this case, input voltage becomes as high as 8 - 12V. Confirm the input rating of your external device and make sure it does not exceed the ratings,
|Answer...||In general we recommend you to use switch-type sensors, such as door sensors (magnetic switches). When you use sensors other than switch-type sensors (which sense logic level output or open collector output), check the maximum ratings/electrical specifications of their input terminals. Make sure to select a sensor with maximum rating/electrical specifications that do not exceed the ratings of your Network Camera or sensors currently used.
There are two types of door sensors (NC or NO, explained below), and the settings for the signal (External Sensor Input) detected by the Network Camera will depend on which sensor you use.
*1: NC (Normally Closed)
The sensor is electrically closed (0 V) normally, and the sensor opens (high impedance) when triggered.
*2: NO (Normally Open)
The sensor is electrically open (high impedance) normally, and the sensor becomes closes (0 V) when triggered.
< Example >
1. The External Device Control Output and External Sensor Input are independent of each other. Signals sent from the External Sensor Input can not automatically switch the External Device Control Output.
2. Configure the setting outside of Network Camera, if needed.
|Answer...||When an alarm triggers an image transfer, the Network Camera will not accept the next alarm signal until the first image transfer image is complete. Therefore, in the event that a sensor is sending a continuous alarm signal, an image transfer will not take place until the current image transfer is complete.
|Answer...||Please refer to the following figures.
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