SEALEVEL SYSTEMS, INC. ULTRA-485 Card Type Serial card Chip Set Unidentified Maximum Onboard Memory Unidentified I/O Options Serial port Hard Drives supported None Floppy drives supported None Data Bus 8-bit ISA Card Size Full-length, full-height [Image] CONNECTIONS Function Label Serial Port P3 BASE I/O ADDRESS SELECTION PORT 1 Setting SW1/1 SW1/2 SW1/3 SW1/4 Disabled On On On On 238h Off On On Off 280h Off Off On On 288h Off Off On Off 290h Off Off Off On 298h Off Off Off Off 2E8h On Off On On 2F8h On On Off On 300h Off On Off On 308h Off On Off Off 3E8h On On Off Off » 3F8h On On On Off 3220h On Off On Off 3228h On Off Off On 4220h On Off Off Off 4228h Off On On On SERIAL PORT 1 INTERRUPT SELECTION IRQ E1/A E1/B E1/C E1/D E1/E E1/F E1/G E1/H E1/I 2 Closed Open Open Open Open Open Open Open Open 3 Open Closed Open Open Open Open Open Open Open » 4 Open Open Closed Open Open Open Open Open Open 5 Open Open Open Closed Open Open Open Open Open 7 Open Open Open Open Closed Open Open Open Open 10 Open Open Open Open Open Closed Open Open Open 11 Open Open Open Open Open Open Closed Open Open 12 Open Open Open Open Open Open Open Closed Open 15 Open Open Open Open Open Open Open Open Closed SERIAL INTERRUPT MODE SELECTION IRQ E2 » Normal Pins 1 & 2 closed Shared Interrupt mode Pins 2 & 3 closed None (1K ohm pull-down resistor) Pins 3 & 4 closed Note: When using two adapters and having them share an IRQ, one must be set in the shared mode and one must be set to include the 1K ohm pull-down resistor. SERIAL PORT RECEIVE MODE SELECTION Function Label Position » RS-485 driver automatically E3 Pins 1 & 2 enabled/disabled for receiver circuit closed Request to send receiver circuit E3 Pins 3 & 4 enabled (RS-485) closed RS-422 enabled for receiver circuit E3 Pins 5 & 6 closed SERIAL PORT TRANSMITT MODE SELECTION Function Label Position » RS-485 driver automatically E5 Pins 1 & 2 enabled/disabled for transmitter closed circuit Request to send transmitter enabled E5 Pins 3 & 4 (RS-485) closed RS-422 enabled for transmitter E5 Pins 5 & 6 circuit closed CONNECTOR PIN ASSIGNMENTS MODE E4 EIA-530 Pins 1-10 closed SIO-485 Pins 11-20 closed LINE TERMINATION Mode Label Position 120 ohm termination enabled SW2/1 On 120 ohm termination disabled SW2/1 Off 1K ohm pull-down resistor enabled SW2/2 On 1K ohm pull-down resistor disabled SW2/2 Off 1K ohm pull-up resistor enabled SW2/3 On 1K ohm pull-up resistor disabled SW2/3 Off Connect TX+ to RX+ for 2 wire operation SW2/4 On (RS-485) Connect TX- to RX- for 2 wire operation SW2/5 On (RS-485)