2070LX Controller – User Manual 61
Version 1.0
6 CHASSIS UNIT
6.1 GENERAL DESCRIPTION
The chassis unit is an aluminum enclosure that serves for containing and interconnecting the different
2070’s modules depending on the selected configuration. It supports the installation of optional modules;
for example, a power supply module, a front panel module, a CPU module, a Field I/O module, and two
communications boards (modems, GPS, synchronous and/or asynchronous boards, etc); also blank filler
plates can be installed for unused slots.
Chassis unit is designed to be convection cooled via vertical ventilation using slots in the top and bottom
plates.
It can be shelf mounted or rack mounted with 170 CALTRANS facilities.
The chassis unit consists of:
Top and bottom sides have slots for convection cooling and flushed nuts for accepting the
thumbscrews of the modules to be installed; also they have flushed nut for installing the serial
motherboard. Left side and right side have provisions for installing the hinge and latch and also
for allowing the controller to be rack mounted.
Screws are stainless steel, countersunk, Phillips, flat head, except for the ones for holding the
serial mother board which are pan head.
Serial motherboard with a wiring harness to be plugged to power supply PS2 receptacle
connector and five DIN-96 receptacle connectors labeled as A1 to A5 for plugging optional
modules.
Card guides on top and bottom sides to allow modules slide and plug to the serial motherboard
and also for installing the power supply module.
The hinge on right side and latch on left side to hold and secure the front panel assembly.
Figure 11: 2070LX Chassis unit
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