ER-430M SVC M.pdf

8 Troubleshooting8-7 RS-232C Serial Communication ProblemRS-232C ProblemLoop BackFailure?NY1. Perform the “SELF TEST” in the S-MODE using the LoopBack test Connector.2. Check the connection of the RS-232C Connector and LoopBack Connector.3. Check the TXD,RXD Pin on CPU.4. Check the MAX232 Driving Chip and related Circuit onMAIN PBA.CommunicationFailure?NY1. Check the connection of the RS-232C and Other side.2. Check the I/F Cable whether it is open or short.3. Check whether Signal is affected by the Cable Noise.H/W HandshakeOk?YN1. Check the connection of the H/W handshaking Line and Otherside2. Check the I/F Cable whether it is open or short.3. Confirm the H/W handshaking Protocol.EndSAM4S ER-430 SERIES 8-7