ADLINK CM1-86DX2 - Manual (Page 40)

34 Module Description
3.9 Serial Ports
Each of the four serial ports is located on one dedicated IDC header (COM1-4.) The ports either
work in RS232 or RS485 modes
, selectable in the BIOS (modification required) or with a user
application. Termination resistors for RS485 Mode must be set by a DIPSwitch (SW1 or SW2).
To enable the transmitters of COM1 through COM4 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:
ADVANCED>CHIPSET>SouthBridge Configuration>Serial/Parallel Port Configuration
The following settings for COM1 through COM4 are available in BIOS setup:
 Serial Port: enabled / disabled
 Base address: 3F8h / 2F8h / 3E8h / 338h / 2E8h / 238h / 328h / 228h / 220
 IRQ: 3 / 4 / 5 / 6 / 7 / 9 / 10 / 11 / 12 / 14 / 15
 Bits per Second: 2400 / 4800 / 9600 / 19200 / 38400 / 56700 / 115200
The default values are:
 COM1 enabled, 3F8h, IRQ4
 COM2 enabled, 2F8h, IRQ3
 COM3 disabled
 COM4 disabled
The maximum supported baud rates are:
 0.75 Mbit/s in RS485 high speed mode
 115.2 Kbit/s in RS232 mode
The baud rates can be configured by the user application.
Utility COM Ports
The CM1-86DX2 provides some extra connectivity for an LV-TTL-UART interface (COM6.) More
information on COM6 can be found in the User GPIO (X17) section and Analog-In (X21) about
GPIOs, which are shared with COM6. COM6 does not provide a transceiver and only RX and
TX signals are present.
COM Headers: Ports 1, 2, 3, 4 (X2, X3, X4, X5)
Connector type: DC10 pin header 2.54 mm
Adapter cable: Article number 862-0046-10
Table 3-18: COM Ports 1-4 Signals (X2, X3, X4, X5)
Pin RS232 RS485/422 Pin RS232 RS485/422
1 DCD Not used 2 DSR RXD+
3 RXD RXD- 4 RTS TXD+
5 TXD TXD- 6 CTS Not used
7 DTR Not used 8 RI Not used
9 GND GND 10 +5.0 V +5.0 V