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Troubleshooting Section 11-3
The serial com-
munications
mode is set to no-
protocol mode.
--- With Serial
Communica-
tions Boards:
The
RXD(235)
instruction
was sent, but
reception is
not being
executed.
The ER Flag (type of condi-
tion flag) is ON.
The setting con-
tents indicated by
the operand in the
RXD(235) instruc-
tion is incorrect.
Review the con-
tents of the oper-
and for the
RXD(235) instruc-
tion.
Auxiliary Area bit A42404
(Inner Board service failure:
(non-fatal error)) is ON.
The RXD(235)
instruction was
sent to a pre-
Ver.1.2 Board that
does not support
no-protocol com-
munications, or a
Board is not
installed.
Replace the Board
with one that is
Unit Ver. 1.2 or
later, or install a
Board.
--- The Overrun Error Flag is
ON.
Board: CIO 190804/CIO
191804 is ON.
Unit: CIO Area word n+8/
n+18 bit 04 is ON.
Data of 260 bytes
or higher was
received in the
reception buffer
during execution of
the RXD(235)/
RXDU(255)
instruction.
Cycle the power or
restart the Board,
and clear the
reception buffer.
Note: If an overrun
error occurs, the
Overrun Error Flag
can be turned OFF
by cycling the
power or restarting
the Unit/Board or
restarting the port.
--- The Reception Overrun Flag
is ON
Board: Auxiliary Area bit
A35607/A35615 is ON.
Unit: CIO Area word n+9/
n+19 bit 07 is ON.
After reception was
completed (after
the Reception
Completed Flag
turned ON), further
data was received
(1 byte or more).
After data recep-
tion is completed
(after Reception
Completed Flag
turns ON), re-exe-
cute the RXD(235)/
RXDU(255)
instruction.
Error conditions Words allocated in CIO
Area
Cause Remedy
Serial communi-
cations mode
Indicator
display
Status and
other condi-
tions
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