Rs-232C & Irc Serial Communication Problem - Sam4s ER-5200 Service Manual

8-7 RS-232C & IRC Serial Communication Problem
RS-232C Problem
Loop Back
Failure ?
N
Communication
Failure?
N
H/W Handshake
Ok?
Y
End
IRC Problem
Loop Back
Failure ?
N
Communication
Failure?
N
End
SAM4S ER-5200 Series
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
Y
Back Connector.
3. Check the Txd,Rxd Pin on CPU.
4. Check the MAX232 Driving Chip and related Circuit on
I/F PBA.
Y
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
N
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.
Y
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.
Y
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