Omega Vehicle Security OMG-USB-DIO48 manual Banks and Ports, Serial String

Technical

Banks and Ports

The OMG-USB-DIO48has 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.

OMG-USB-DIO48 Page 5