The SF-ALARM1606-USB is an alarm expansion module for Safire Smart recorders, designed to add 16 alarm inputs and 6 relay outputs to the device.
Its installation is Plug & Play. No prior configuration is necessary for the recorder to detect the alarm inputs and outputs: simply connect the module to a USB port on the Safire Smart XVR/NVR using the corresponding cable. Once connected, the inputs and outputs will appear available in the recorder's alarm menu.
In this image, you can see how initially the alarm outputs of the Safire Smart recorder had 4 relay outputs, and when connected, 6 additional relay outputs appear.
In these images, you can see how in the alarm inputs section, there are by default 8 physical inputs, and when the expander is connected, 16 additional inputs appear.