TME-CLR-ECO-R0V6.docx
Rev 0.6
Page 21 of 34
3.8
Serial Ports (X17)
The Cool LiteRunner-ECO provides two multiprotocol serial ports. The maximum supported baud rates are:
RS485 mode:
up to 1.5 MBit/s
RS232 mode:
up to 500 Kbit/s
Two serial ports are located on one IDC header "COM". The ports either work in RS232 or RS485 mode,
selectable in BIOS on entering
Special CLR Features->Toggle COM1 Mode or Toggle COM2 Mode
.
Termination resistors for RS485 Mode can be set with jumpers on pin headers as described in that chapter.
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
Integrated Peripherals -> SuperIO Device->
Onboard Serial Port 1
or
Onboard Serial Port 2
, 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)
•
Auto
COM Connector
Connector type:
IDC20 pin header 2.0 mm
Matching connector:
IDC20 pin female connector 2.0 mm
Pin
RS232
RS485
Pin
RS232
RS485
1
DCD1
Not used
2
DSR1
RXD1+
3
RXD1
RXD1-
4
RTS1
TXD1+
5
TXD1
TXD1-
6
CTS1
Not used
7
DTR1
Not used
8
Not used
Not used
9
GND
GND
10
+5V
+5V
11
DCD2
Not used
12
DSR2
RXD2+
13
RXD2
RXD2-
14
RTS2
TXD2+
15
TXD2
TXD2-
16
CTS2
Not used
17
DTR2
Not used
18
Not used
Not used
19
GND
GND
20
key
key
Note:
Maximum current on a +5V pin is 0.5A.
