334
Troubleshooting Section 11-3
The serial com-
munications
mode is set to no-
protocol mode.
--- With Serial
Communica-
tions Units:
The
TXDU(256)
instruction
was sent, but
reception is
not being exe-
cuted.
The Communications Port
Enabled Flags (A20200 to
A20207) are OFF (execution
disabled).
The TXDU(256)/
RXDU(255)
instruction, or
SEND(090),
RECV(098),
CMND(490), or
PMCR(260)
instruction is
being executed
using the same
communications
port No.
Either use a com-
munications port
other than that exe-
cuting the
TXDU(256),
RXDU(255),
SEND(090),
RECV(098),
CMND(490), or
PMCR(260)
instruction (Bits 12
to 15 of C1), or wait
until the required
port can be used
and then execute
the TXDU(256)
instruction.
The serial com-
munications
mode is set to no-
protocol mode.
--- With Serial
Communica-
tions Boards:
The
TXD(236)
instruction
was sent, but
reception is
not being exe-
cuted.
The ER Flag (type of condi-
tion flag) is ON.
The setting con-
tents indicated by
the operand in
the TXD(236)
instruction is
incorrect.
Review the con-
tents of the operand
for the TXD(236)
instruction.
The TXD(236)
instruction was
sent while the
Send Delay Flag
(bit A35605/
A35613) was
OFF.
Insert an AND in
the input condition
for a NO condition
of the Send Delay
Flag (bit A35605/
A35613).
Auxiliary Area bit A42404
(Inner Board service failure:
(non-fatal error)) is ON.
The TXD(236)
instruction was
sent to a pre-
Ver.1.2 Board
that does not
support no-proto-
col communica-
tions, or the
Board is not
installed.
Replace the Board
with one that is Unit
Ver. 1.2 or later, or
install a Board.
--- A hardware error
has occurred in
the transmission
circuit.
Conduct a loopback
test in serial com-
munications mode
to check the trans-
mission lines. If an
error occurs during
the test, replace the
Board or Unit.
Error conditions Words allocated in CIO
Area
Cause Remedy
Serial communi-
cations mode
Indicator
display
Status and
other condi-
tions
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