User`s guide
Card Setup
OMG-ISO-COMM Page 3
Port Enable / Disable
Each port on the OMG-ISO-COMM can be enabled or disabled with switch
position 8 on the DIP-switch. The port is enabled with the switch ‘On’ or
‘Closed’ and disabled when ‘Off’ or ‘Open’. If any port is disabled, be sure to
disable the interrupt request for that port by removing the IRQ jumper.
IRQ Selection
Headers E1, E2, E3 and E4 select the IRQ for each serial port. If COM1: is
selected, this jumper must be on the IRQ4 setting. If COM2: is selected, this
jumper must be on IRQ3.
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E3 - Port2
E4 - Port1
E2 - Port3
E1 - Port4
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Figure 3 - Headers E1, E2, E3, and E4 (Factory Default)
Note: Most communications software applications default COM3: to IRQ4 and
COM4: to IRQ3. This requires the sharing of interrupts between COM1:
and COM3:, and between COM2: and COM4:. While this is the default, it
is not always the preferred setting. Check your software configuration
instructions to determine the most appropriate IRQ selection.