SJ300 Inverter
The communication test mode verifies that the inverter can properly send and receive data via the RS485 serial port. Follow the steps below to perform the communication test.
1.Remove the serial cable (if present) connected to the TM2 connector block of the control terminals, as shown below.
TM2
SP 
SN 
RP 
SN 
Serial
communications
B Appendix
NOTE: It is not necessary to connect a loopback jumper. The RS485 port uses a transceiver for communications, which already allows simultaneous transmitting and receiving.
2.Use the front panel keypad to navigate to parameter C071, Communication Speed Selection. Change parameter C071=02 and press Store. Value 02 is the Test option. Now the inverter is ready to conduct the loopback test.
3.Turn the inverter power OFF and then ON again. Observe the keypad display and compare to the results shown below.
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4.Press the Stop/Rest button on the keypad to return the inverter keypad/ display to normal operation.
5.Change C071 to its original setting (default is C071=04). Otherwise, while C071=02, the inverter will perform the communications loopback test at each powerup.