SPI Expansion Port

The SPI (Serial Peripheral Interface) expansion port on the KT-400 is used to connect expansion modules, in order to add more inputs and outputs such as relays. The maximum current draw for the SPI expansion port is 500 mA when the 12V AUX terminals are not used. The 6-pin SPI cable must be connected to the SPI IN of the first module. See Figure 9 and Figure 11 for examples of interconnection between the KT-400 and expansion modules.

Figure 9: KT-400 Interconnection Examples with Expansion Modules

The number of expansion modules that can be connected to the KT-400 SPI expansion port, without an additional external power supply, can vary depending how much current is drawn from all the modules in the SPI chain.

Check the following table to calculate the SPI chain current draw:

Expansion Module	Qty of modules x Maximum current draw	Total
		Current


KT-MOD-REL8	_______ x 330 mA	______ mA

KT-MOD-INP16	_______ x 40 mA	______ mA

KT-MOD-OUT16	_______ x 750 mA	______ mA

Maximum current draw from KT-400 SPI expansion port when the 12 VDC AUX terminals are not used.		- 500 mA

If the total current is between 0 mA and 1850 mA (1.85 Amps), 1 external power supply is required.
If the total current is between 1851 mA and 3700 mA (3.70 Amps), 2 external power supply are required.

Example of current draw calculation:

1.15 modules (KT-MOD-OUT16) x 750 mA = 11250 mA

2.11250 mA - 500 mA (or 0 mA if the 12 VDC AUX of the KT-400 is used) = 10750 mA

3.10750 mA divided by 1850 mA = 5.8 which means in fact 6 external power supplies 12 VDC, 2 Amps are required.

4.Connect an external power supply at every expansion module where the current draw has reached 1.85 Amps.

5.Make sure the power jumper on the modules is in the correct position when using external power supply(ies).

24	DN1726-0811

KT-400 specifications

The American Dynamics KT-400 is a robust and versatile video management system designed for a wide range of security applications. As a part of American Dynamics' extensive lineup of surveillance solutions, the KT-400 caters to various industries, including retail, transportation, and critical infrastructure, enabling efficient surveillance and management of video data.

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In conclusion, the American Dynamics KT-400 stands out for its scalability, advanced video analytics, high-performance recording, and broad compatibility with different camera types. These features make it an ideal choice for organizations looking to enhance their security management and respond swiftly to potential threats. With ongoing technological advancements, the KT-400 is poised to remain a reliable choice in the evolving security landscape.

American Dynamics KT-400 SPI Expansion Port, Example of current draw calculation

Models: KT-400