Specifications

TME-EPIC-HURLX-R3V5.docx
Rev 3.5
Page 20 of 49
3.9 Serial Ports
COM1 is located at the I/O panel while COM2 is an IDC10 pin header (J19). An adapter cable with a standard DB9
male connector is available. The ports either work in RS232 or RS485 mode, selectable in the BIOS. When
entering
Serial and Parallel Ports, COM Port 1 Mode and COM Port 2 Mode can be selected. Termination resistors
for RS485 Mode can be set with Jumpers on pin header J26 as described below.
To enable the transmitters of COM1 and COM2 in RS485 mode set the RTS# signal to ‘1’. Depending on your
operating system driver’s logic, this may mean setting a (non-inverted) RTS bit to ‘0’ in your application software.
The serial ports are programmable in BIOS setup. When entering Serial and Parallel Ports, configuration of the
serial ports is accessible.
The following settings are possible for COM1 and COM2:
• Disabled
• 3F8 / IRQ4 (base address / interrupt channel)
• 2F8 / IRQ3 (base address / interrupt channel)
• 3E8 / IRQ4 (base address / interrupt channel)
• 2E8 / IRQ3 (base address / interrupt channel)
The modes can be switched between RS232 and RS485.
Serial Jumper Settings (J26)