Omega Vehicle Security OMG-USB-DIO48 - Manual (Page 9)

Technical
OMG-USB-DIO48 Page 5
Banks and Ports
The OMG-USB-DIO48 has two 50 pin headers. Each 50 pin header is a bank of
three ports, comprising a total of six eight bit ports. Each port is eight bits wide
and may be configured as an input or output port. Figure 3 below gives the bank
and port organization.
Bank 1 – P2 Bank 2 – P3
Port A1 Port A2
Port B1 Port B2
Port C1 Port C2
Figure 3- Bank and Ports
Serial String
Each device has an eight digit alphanumeric serial string stored in non-volatile
memory. On the Windows platforms, this number is used to give each unit a
separate identity. This identity allows the device to be moved to any USB port or
hub port on your computer while retaining its device number. If a device
becomes damaged and is replaced the new device should be given the same
serial string as the device it is replacing.
This string is stored in an EEPROM along with other critical information. This
EEPROM is read during enumeration. The device should not be unplugged
during its enumeration due to a remote possibility that the data in the EEPROM
could be corrupted if power is removed during a read/write cycle.
The control panel utility provides the capability to read or modify this string.
However, setting the same string for two units will cause the second unit to fail
enumeration, and make it invisible to the operating system. Should this occur,
unplug one unit and set the serial string for the other unit to a different string.