Sam4s ER-380F - RS-232 C Serial Communication Problem

8 Troubleshooting
SAM4S ER-380M/F SERIES 8-9
8-7 RS-232C Serial Communication Problem
End
RS-232C Problem
Loop Back
Failure?
Y
N
1. Perform the “SELF TEST” in the S-MODE using the Loop
Back test Connector.
2. Check the connection of the RS-232C Connector and Loop
Back Connector.
3. Check the TXD,RXD Pin on CPU.
4. Check the MAX232 Driving Chip and related Circuit on
I/F PBA.
Communication
Failure?
1. 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.
N
H/W Handshake
Ok?
Y
Y
1. Check the connection of the H/W handshaking Line and Other
side
2. Check the I/F Cable whether it is open or short.
3. Confirm the H/W handshaking Protocol.
N