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Troubleshooting Section 11-3
Transmission Failure (TXD(236), TXDU(256))
Error conditions Words allocated in CIO
Area
Cause Remedy
Serial communi-
cations mode
Indicator
display
Status and
other condi-
tions
Serial communi-
cations mode is
no-protocol mode
--- --- CIO Area word n+5/n+15 bits
12 to 15 (serial communica-
tions mode) is set to a value
other than 3 hex.
The serial com-
munications
mode is not set
correctly.
---
Board --- --- Bit A42404 (Inner Board ser-
vice failure) in the Auxiliary
Area is ON when the
TXD(236) instruction is exe-
cuted.
The serial com-
munications
mode is not set
correctly.
Or
A no-protocol
instruction was
sent using no-
protocol mode to
a Board that
does not support
no-protocol com-
munications (pre-
Ver.1.2).
Set bits 08 to 11 of
DM Area word m/
m+10 (serial com-
munications mode)
to 3 hex (no-proto-
col mode).
Or
Install a Board with
Unit Ver. 1.2 or later
that supports no-
protocol communi-
cations, and after
replacing, set the
serial communica-
tions mode to no-
protocol mode.
Unit: Protocol
macro mode,
NT Link, loop-
back test
--- --- During execu-
tion of the
TXDU(256)
instruction
FINS end
code such as
0401 hex
(undefined
command) is
returned.
The serial com-
munications
mode is not set
correctly.
Or
A no-protocol
instruction was
sent using no-
protocol mode to
a Board that
does not support
no-protocol com-
munications (pre-
Ver.1.2).
Set bits 08 to 11 of
DM Area word m/
m+10 (serial com-
munications mode)
to 3 hex (no-proto-
col mode).
Or
Install a Board with
Unit Ver. 1.2 or later
that supports no-
protocol communi-
cations, and after
replacing, set the
serial communica-
tions mode to no-
protocol mode.
Unit: Host
Link
FINS end
code such as
0205 hex
(response
timeout) is
returned.
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