BRAIN BOXES AT DUAL PORT RS422/485 Card Type Serial card Chip Set Unidentified Data Bus 8-bit ISA [Image] CONNECTIONS Function Label Function Label 9-pin serial port 1 CN1 9-pin serial port 2 CN2 USER CONFIGURABLE SETTINGS Function Label Position » Serial port 1 half duplex gate J5A Pins 1 & 2 disabled closed Serial port 1 half duplex gate J5A Pins 2 & 3 enabled when RTS true closed » Serial port 1 half duplex RTS J5B Pins 1 & 2 disabled closed Serial port 1 half duplex RTS J5B Pins 2 & 3 enabled closed » Serial port 1 half duplex CTS1 J5C Pins 1 & 2 disabled closed Serial port 1 half duplex CTS1 J5C Pins 2 & 3 enabled closed » Serial port 2 half duplex gate J6A Pins 1 & 2 disabled closed Serial port 2 half duplex gate J6A Pins 2 & 3 enabled when RTS true closed » Serial port 2 half duplex RTS J6B Pins 1 & 2 disabled closed Serial port 2 half duplex RTS J6B Pins 2 & 3 enabled closed » Serial port 2 half duplex CTS1 J6C Pins 1 & 2 disabled closed Serial port 2 half duplex CTS1 J6C Pins 2 & 3 enabled closed SERIAL PORT ADDRESS SELECTION Setting J2 Port 1 J2 Port 2 COM1 Pins 1 & 2 closed Pins 2 & 3 closed COM2 Pins 4 & 5 closed Pins 5 & 6 closed COM3 Pins 7 & 8 closed Pins 8 & 9 closed COM4 Pins 10 & 11 closed Pins 11 & 12 closed COM5 Pins 13 & 14 closed Pins 14 & 15 closed COM6 Pins 16 & 17 closed Pins 17 & 18 closed COM7 Pins 19 & 20 closed Pins 20 & 21 closed COM8 Pins 22 & 23 closed Pins 23 & 24 closed SERIAL PORT 1 INTERRUPT SELECTION IRQ J3 IRQ2 Pins 11 & 12 closed » IRQ3 Pins 9 & 10 closed IRQ4 Pins 7 & 8 closed IRQ5 Pins 5 & 6 closed IRQ6 Pins 3 & 4 closed IRQ7 Pins 1 & 2 closed IRQ10 Pins 13 & 14 closed IRQ11 Pins 15 & 16 closed IRQ12 Pins 17 & 18 closed IRQ14 Pins 19 & 20 closed IRQ15 Pins 21 & 22 closed SERIAL PORT 2 INTERRUPT SELECTION IRQ J4 IRQ2 Pins 11 & 12 closed » IRQ3 Pins 9 & 10 closed IRQ4 Pins 7 & 8 closed IRQ5 Pins 5 & 6 closed IRQ6 Pins 3 & 4 closed IRQ7 Pins 1 & 2 closed IRQ10 Pins 13 & 14 closed IRQ11 Pins 15 & 16 closed IRQ12 Pins 17 & 18 closed IRQ14 Pins 19 & 20 closed IRQ15 Pins 21 & 22 closed SERIAL PORT 1 MULTIPLEX SELECTION Setting J7 » Multiplex disabled Pins 1 & 3, 2 & 4 closed Signal transmitted & received Pins 3 & 5, 4 & 6 closed Signals shorted together Pins 3 & 5, 4 & 6 closed SERIAL PORT 2 MULTIPLEX SELECTION Setting J8 » Multiplex disabled Pins 1 & 3, 2 & 4 closed Signal transmitted & received Pins 3 & 5, 4 & 6 closed Signals shorted together Pins 3 & 5, 4 & 6 closed