ADLINK CM3-GF - Manual (Page 45)

TME-104P-CMx-GF-1V7 Rev 1.7 37 (81)
3.12 Serial Ports
Two serial ports are located on one IDC COM header. The ports work in either RS232 or RS485 mode,
selectable in BIOS. The 120 ohm termination resistor for RS485 mode is not on the module. Please use the
external termination resistor.
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
ADVANCED  SMSC SCH311X SIO
configuration of the serial ports is accessible.
The following settings are possible for COM1 and COM2 in Bios setup:
 Serial Port: enabled / disabled
 Base address: 3F8h, 2F8h, 3E8h, 2E8h, 3A8h, 2A8h
 IRQ: 3, 4, 7, 11, 15
 MODE: RS232, RS485
The default values are:
 COM1 enabled, 3F8h, IRQ4, RS232
 COM2 enabled, 2F8h, IRQ3, RS232
The maximum supported baud rates are:
 1.5 Mbit/s in RS485 mode
 430 Kbit/s in RS232 mode