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The equipment plugged into the UPS doesn accept RS232 signal but only the contact closure signal. Why can I use contact closure function in Cyber Power Office series UPS?

closure contact cyber equipment function plugged rs232 signal UPS
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The equipment plugged into the UPS doesn accept RS232 signal but only the contact closure signal. Why can I use contact closure function in Cyber Power Office series UPS?

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The contact closure function is disabled out of factory. You can down the S/W patch to enable the contact closure function.

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