TME-104P-CSR-LX800-R1V11.doc
Rev 1.11
23 (50)
3.10
Serial Ports
The maximum supported baud rates:
RS485 mode
1,5 Mbit/s
9
RS232 mode
The serial ports are located on two IDC headers "COM1" and "COM2". Adapter cables with standard DSUB-9
male connectors are available. The ports either work in RS232 or RS485 mode, selectable in BIOS.
When entering Serial and Parallel Device Configurations, COM Port 1 Mode and COM Port 2 Mode can be
selected. Termination resistors for RS485 Mode can be set with Jumpers on pin headers as described in this
chapter.
115 kbit/s
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 Device Configurations,
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.
COM1/2 Connector
Connector type:
IDC10 pin header 2.54 mm
Matching connector:
IDC10 pin female connector 2.54 mm
Pin
RS232 RS485
Pin
RS232
RS485
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
Not used
Not used
9
GND
GND
10
+5 Volt
10
+5 Volt
10
9
That baud rate requires changing registers manually, it is not supported by the default driver
10
0.5 A is the maximum current for that pin
X11, X12
