IDTECK Star LX505 User Manual page 69

☞ The communication between the LX505 and the Host PC fails.
A defective cable may be used or errors in wiring, setting COMM ID of the controller, or
Cause damage on the communication port (either on the PC side or the controller side) may also
cause the communication inability.
1. Please check the settings of the application software and the controller.
- Check if the COMM ID of the controller is listed on the application software.
- Set the different COMM ID when two or more controllers are installed.
- Check if the communication speed (9600bps is default) is the same as the setting on
the software.
- Make sure that the PC's COM port is set correctly on the S/W.
- The parameters in the software should be set as following:
Parity bit
Data bit
Stop bit
2. Check the line connection for communication.
Solution
3. We recommend you to use line-end resistors of 120 Ohm between the RTX (+) and RTX
(-) lines when you are using the RS485 communication,. Apply the same resistors to the
converter RS485 lines. Consult a service center or an electric technician if you are not
sure how to do it.
4. When a multi-drop communication doesn't work, test one-by-one communication first.
5. If the trouble remains after following the procedures above, contact a designated
service center.
: NONE
: 8bit
: 1bit
RS232
LX505 PC
RX TX
TX RX
GND GND
LX505 LX505
RTX(-) RTX(-)
RTX(+) RTX(+)
RS485 (mono)
RS485/232
LX505
Converter
RTX(-) RTX(-)
RTX(+) RTX(+)
RS485(Multi Drop)
RS485/232
Converter
RTX(-) The RS232 cable from
the converter
RTX(+)
69
PC
The RS232 cable from the
converter
PC