Troubleshooting serial com 3-2 – Yaskawa F7 Modbus User Manual
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Troubleshooting Serial COM 3-2
RS232 Communications
The following is a quick reference guide for troubleshooting RS232 serial communications to the F7 drive. Make a copy of the following pages
and check-off each item as it is completed. For detailed information on the RS232 standard please refer to EIA RS-232-C. or later revision For
information on the F7 drive RS232 interface, refer to previous sections of this manual.
1:
For RS232 communications
1.1:
Verify that the correct cable is used to connect the controller to the F7 drive.
1.2:
Verify that the controller is set for RS232 communications and that the communications’ cable is connected to the
correct communications port.
1.3:
Record the controller communications’ parameters
Baud Rate
Parity
Data
Bits
Stop
Bits 1
1.4:
Record the F7 drive communications’ parameters (H5-02, H5-03, H5-07)
Baud Rate
Parity
Data
Bits
Stop
Bits 1
1.5:
Verify that the communications’ parameters match.
2:
Check the controller RS232 wiring requirements
2.1:
CTS(Clear to Send)/RTS(Ready to Send) jumper required on the controller end?
2.2:
DTR(Data Terminal ready)/DSR(Data Set Ready)/RLSD(Receive Line Signal Detector) jumper required on the
controller end?
2.3:
TxD(Transmit Data)/RxD(Receive Data) connections are made correctly.
3:
Send a message from the controller to the F7 drive.
3.1:
Connect an oscilloscope between the F7 drive RxD and GND.
3.1.1: Verify that the message pulse train exists and contains the correct number of pulses. Refer to the chapter
Message Formats for information on the message contents.
3.1.2: Verify that he signal levels adhere to the RS232 standard.
3.2:
Insert a data analyzer in the RS232 circuit and capture the message sent by the controller in a hexadecimal format.
Record the command message below.
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