B&B Electronics RS-232/422/485 Serial Card CE 3PXCC4A - Manual (Page 37)

Manual Document# 3PXCC4A3001 35
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
Shared IRQ Mode
The 3PXCC4A card has the ability to share interrupts
among its ports. Shared IRQ mode should only be used if your
software supports this feature. If you are writing your own software,
B&B Electronics’ SimpCom V1.04 and later serial communications
library supports this feature.
When sharing ports, use JP5 to set each of the ports to be
used in shared mode to the SHARE position. JP6 must also be set
to the SHARE position. Each of the ports set to SHARE will use the
Port A IRQ. Therefore when sharing IRQs among two or more ports,
Port A must always be one of the shared ports.