DECISION COMPUTER INTERNATIONAL CO., LTD. PCCOM 8-BIT ISA 2-PORT RS422/485 Card Type Serial Chipset Unidentified I/O Options Serial ports (2) Data Bus 8-bit ISA [Image] CONNECTIONS Function Label Serial ports via DB-37 port CH1 Note:Standard DB-25 serial ports are provided on an included adapter cable. SERIAL PORT ADDRESSES Port 1 Address Port 2 Address JP7 » 3F8h (COM1:) 2F8h (COM2:) Pins 1 & 3, 2 & 4 closed 3E8h (COM3:) 2E8h (COM4:) Pins 1 & 3 closed 1A0h 1A8h Pins 2 & 4 closed PORT 1 INTERRUPT Setting JP5/A JP5/B JP5/C JP5/D JP5/E JP5/F IRQ2 Open Open Open Open Open Pins 2 & 3 IRQ3 Open Open Open Open Pins 2 Open & 3 » IRQ4 Open Open Open Pins 2 Open Open & 3 IRQ5 Open Open Pins 2 Open Open Open & 3 IRQ6 Open Pins 2 Open Open Open Open & 3 IRQ7 Pins 2 Open Open Open Open Open & 3 Note:Pins designated are in the closed position. PORT 2 INTERRUPT Setting JP5/A JP5/B JP5/C JP5/D JP5/E JP5/F IRQ2 Open Open Open Open Open Pins 1 & 2 » IRQ3 Open Open Open Open Pins 1 Open & 2 IRQ4 Open Open Open Pins 1 Open Open & 2 IRQ5 Open Open Pins 1 Open Open Open & 2 IRQ6 Open Pins 1 Open Open Open Open & 2 IRQ7 Pins 1 Open Open Open Open Open & 2 Note:Pins designated are in the closed position. PORT 1 TRANSMIT DRIVER Setting JP1/A JP1/B JP1/C Always on Closed Open Open Follows RTS signal Open Closed Open Follows bit 0 of Open Open Closed control register PORT 2 TRANSMIT DRIVER Setting JP2/A JP2/B JP2/C Always on Closed Open Open Follows RTS signal Open Closed Open Follows bit 0 of Open Open Closed control register PORT 1 RECEIVE DRIVER Setting JP3 Always on Pins 1 & 3 closed Follows bit 1 of control register Pins 2 & 4 closed PORT 2 RECEIVE DRIVER Setting JP4 Always on Pins 1 & 3 closed Follows bit 1 of control register Pins 2 & 4 closed WAIT STATES Setting JP6/A JP6/B JP6/C JP6/D JP6/E 0 Closed Open Open Open Open 1 Open Closed Open Open Open 2 Open Open Closed Open Open 3 Open Open Open Closed Open 4 Open Open Open Open Closed