On-board RS232-C Channels – CI853
Section 5 Maintenance
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3BSE 027 941 R301
On-board RS232-C Channels – CI853
Table 26. On-board RS232-C Channels CI853 – Fault-Finding
Fault
Possible Cause and Corrective Action
The PM8xx is transmitting and the
Tx1/Tx2 LEDs are flashing, but
the connected device is not
receiving data.
OR
The connected device is
transmitting, but the Rx1/Rx2
LEDs are not flashing.
•
Check that the communication
interface cable is connected.
•
Check the hand-shake signals.
The Tx/Rx signals are flashing
concurrently with
transmission, but the messages
are not being received correctly
by the connected device.
•
Check that the baud rate, parity, and
number of data and stop bits are as
specified for the connected device.
•
Check that the handshake procedures
are as specified at both ends.
•
Check that the driver routines are
adequate, both in the controller and
the connected device.
•
Disconnect power to the controller,
wait a moment and then power-up
again.
•
Halt the program and initiate a reset
signal (INIT) from the PM8xx
processor unit.
Summary of Contents for AC 800M
Page 1: ...ControlIT AC 800M Version 2 1 Controller Hardware Hardware and Operation...
Page 2: ......
Page 3: ...Controller Hardware Hardware and Operation ControlIT AC 800M Version 2 1...
Page 10: ...7DEOH RI RQWHQWV 10 3BSE 027 941 R301...
Page 20: ...Related Documentation About This Book 20 3BSE 027 941 R301...
Page 26: ...Operating Environment Safety Summary 26 3BSE 027 941 R301...
Page 42: ...Product Release History Section 1 Introduction 42 3BSE 027 941 R301...
Page 108: ...Powering from an External 24 V DC Source Section 3 Configuration 108 3BSE 027 941 R301...
Page 118: ...Verification of Redundant CPU Section 4 Operation 118 3BSE 027 941 R301...
Page 212: ...Low Voltage Directive LVD Appendix D Directive Considerations 212 3BSE 027 941 R301...
Page 214: ...Hazardous Location Approval Appendix E Standards 214 3BSE 027 941 R301...
Page 228: ...QGH 228 3BSE 027 941 R301...
Page 229: ......