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Section 5 Maintenance On-board RS-232C Channels – CI853
3BSE036351-510 A 213
On-board RS-232C Channels – CI853
Table 33. On-board RS-232C 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.
CI853 supports hot swap.
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