Manual Number: 00750-004-14
Page 3-1
Chapter 3: Option Selection
The board contains several jumper straps for each port which must be set for proper operation.
Port Enable/Disable
Each port on the WINCOMM4 can be enabled or disabled with switch position 8 on the dip switch.
The port is enabled with the switch “ON” and disabled when “OFF” or “OPEN”. If any port is
disabled, be sure to also disable the interrupt request for that port by removing the IRQ jumper (see
below).
E1-E4:
Selects the interrupt 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.
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 application’s configuration
instructions to ascertain the most appropriate IRQ selection.
Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting
and setting the appropriate selection at E5. Consult your particular software for IRQ selection. If
no interrupt is desired, remove the jumper.
Note
- that IRQ 2 on AT class machines is not available for users. IRQ 9 is substituted in place of
IRQ 2. To select IRQ 9 place jumper on the IRQ 2 position.
