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COM1/2
Connector type
RS485-Termination Jumpers
Connector type IDC12 pin header 2.00 mm
Use 2 mm jumpers to terminate lines correctly.
There are two jumpers COM1 and COM2, respectively.
The RS485 termination jumpers are located at the
bottom of the printed circuit board, see chapter
Pin
Signal
1
TX+_COM1
3
RX+_COM1
5
TX+_COM2
7
RX+_COM2
9
TX+_COM3
11
RX+_COM3
When the jumper is set, the differential pairs
are terminated with 120Ω between them.
(e.g. RX+ and RX-, on the right picture)
Additionally, positive/negative receive lines are pulled
up/down with 10kΩ to 5V/GND in order to protect the
transceivers of the Cool LiteRunner-LX800 from over voltages.
It is recommended to protect the ports of the external device in the same way!
TME-104-CLR-LX800-R1V3.doc
IDC10 pin header 2.54 mm
Pin
RS232
RS485
1
DCD
Not used
3
RXD
RXD-
5
TXD
TXD-
7
DTR
Not used
9
GND
GND
Pin
Signal
2
TX-_COM1
4
RX-_COM1
6
TX-_COM2
8
RX-_COM2
10
TX-_COM3
12
RX-_COM3
Caution: Termination Resistors should not be used in RS232 Mode!
Otherwise, the serial ports will not work.
Rev. 1.3
Pin
RS232
2
DSR
4
RTS
6
CTS
Not used
8
Not used
Not used
10
+5 Volts
+5 Volts
2 .2
1 7 2 H
Module
side
RS485
RXD+
TXD+
+5V
10K
RX+
Jumper
External
120
RX-
10K
GND
25(53)
device
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