GAI-Tronics 69440-001 Master Control Unit PCBA (MCU) - Manual (Page 3)

Pub. 42004-676L2B
Model 69440-001 Master Control Unit PCBA Page: 3 of 8
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The VGA connector enables connecting a VGA monitor to the MCU. This connector is color coded to
match the PC99 standard.
The USB Port 0 and USB Port 1 connectors enable connecting USB 1.0 devices to the MCU.
The Reset button resets the MCU. Momentarily depress the RESET button to reset and re-boot the
MCU. Holding in the R
ESET button will keep the MCU in reset mode, and it will not re-boot. The
button is recessed to prevent accidental depressions.
Card Rack Rear Panel Connections
The LPT1 parallel port provides a parallel port connection to the MCU. This is typically used for
connecting a printer. This connector’s pin-out matches that of a standard PC’s 25-pin parallel port
connector pin-out.
The COM1 RS485 half-duplex port provides a half-duplex RS485 connection to the MCU. This
connector’s pin-out is proprietary. Also, this connection provides a dry contact closure output. If
applicable, the operation of this connector is described in your system manual.
The COM2 RS485 half-duplex port provides a half-duplex RS485 connection to the MCU. This
connector’s pin-out is proprietary. Also, this connection provides a dry contact closure output. If
applicable, the operation of this connector is described in your system manual.
N
OTE : The COM2 RS232 port is logically in parallel with the COM2 RS485 half-duplex port on the
front panel of the MCU; therefore, both of the ports may not be used simultaneously.
MCU Internal Connections
The CPU Module holds the microprocessor that controls the system.
The Ethernet port provides an Ethernet connection to the CPU Module.
The battery allows the CPU Module to keep track of the date and time in the event of a power failure.
N
OTE : CMOS settings are stored in EEPROM; their storage does not rely on battery power during a
power failure.
A 2.5-inch IDE Hard Drive connects to the CPU Module. The 2.5-inch IDE hard drive is formatted and
proper software is factory installed.
A CompactFlash Card connects to the CPU Module. The Compact Flash card is formatted and proper
software is factory-installed.
The Upper VME Connectors provides the mechanical connection to the card rack’s backplane.
The Lower VME Connector provides the mechanical connection to the rear panel of the card rack. used
for connection of external devices described above under Card Rack Rear Panel Connections section.