E2 e1 – Impulse 3087 User Manual

Page 6

Card Setup

Sealevel Systems COMM+2/EX Page

Port Enable / Disable

Each port on the COMM+2/EX 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.

Interface Selection

RS-422/485

To select the RS-422/485 mode of operation install dip shunts in sockets found at E6 and E7. E6 sets Port 1 and E7
sets Port 2.

RS-232

To select the RS-232 mode of operation install dip shunts in sockets found at E5 and E8. E5 sets Port 1 and E8 sets
Port 2.

IRQ Selection

Headers E1 and E2 select the interrupt request for each serial port (E1 - Port 2, E2 - Port 1). If COM1: is selected,
the corresponding jumper must be on the IRQ4 setting. If COM2: is selected, the corresponding jumper must be on
IRQ3.

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Figure 3 - Header E1 and E2, IRQ Selection

Any two or more ports can share a common IRQ, provided a polling driver is used, by placing the jumpers on the
same IRQ setting and setting the appropriate selections at E3. The following examples show the setup if a polling
driver is used. NOTE: Windows does not provide a polling driver. Consult your particular software for IRQ
selection. If no interrupt is desired, remove the jumper.