STC Smartscan NG2, Manual

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May 2021, SmartScanNG² User's Guide for Wayside Enclosure Components, EUD-2018086-00 Rev.3
2.1.3 System Interface Board (2300-110)
As its name implies, all of the interface and signal conditioning circuitry is located on the
Interface board. This board connects to the System-Interconnect board with a 60-position
ribbon connector and an 8-position Molex connector, which is shown below.
The board operates from an unregulated battery voltage of 9VDC to 30VDC. The power input
circuitry includes radio-frequency interference suppression, voltage surge protection, open
fuse LED indicator, a self-restoring fuse, and reverse polarity protection. The board produces
regulated 3.3VDC, -5 VDC, reg5 VDC, reg12 VDC, and reg15 VDC to
power the on-board circuitry, Velocity Board, and external scanner circuitry.
The figure below shows the System Interface board (2300-110). The board is shown as one
would see it in service, which is the normal orientation for the board on a properly installed
system.
Analyzer
Comm