Omega-vehicle-security OMG-USB-DIO48 Manuel d'utilisateur télécharger pdf (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.

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Omega-vehicle-security OMG-USB-DIO48 Manuel d'utilisateur Page 9