Sam4s ER-5200 Service Manual page 63

8-7 RS-232C & IRC Serial Communication Problem
RS-232C Problem
Communication
H/W Handshake
IRC Problem
Communication
SAM4S ER-5200 Series
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Loop Back Y
Failure ?
N
Y
Failure?
N
N
Ok?
Y
End
Loop Back Y
Failure ?
N
Y
Failure?
N
End
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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.
1. Check the connection of the RS-232C Conn 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.
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.
1. Perform the "SELF TEST" in the S-MODE using the Loop
Back test Connector.
2. Check the Tx,Rx Pin on I/F PBA.
3. Check the 75176 Driving Chip and related Circuit on I/F PBA.
1. Check the connection of the IRC Connector and Other side.
2. Check the IRC Cable whether it is open or short.
3. Check whether Signal is affected by the Cable Noise.
8 Troubleshooting
8-7