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Auxiliary Area and CIO Area Allocations Section 5-3
Error Data In Data Agreeing with Expected Receive Message
When RECV is executed, an expected receive message is searched for in the
reception buffer. If the data that has been received agrees with an expected
receive message, it is processed as receive data. If error details are included
in the receive data, the corresponding error flags will turn ON.
The following example shows when 100 bytes of data is received that agrees
with an expected receive message.
Data Not Agreeing with Expected Receive Message
If error details are included in data that do not agree with an expected receive
message, the data will simply be discarded and the error flag status will
remain unchanged. For trace information, all error details in the reception
buffer will be stored within capacity for the trace data.
The following example shows when a parity error occurs for data that does not
agree with an expected receive message.
Protocol Status The information shown in the following table is input from the Board or Unit to
the Protocol Status Words in the CPU Unit.
n = CIO 1500 + 25 × unit number
Error Flag ON
100 bytes
P: Parity error
(P)
(P)
Error flags remain
unchanged
Data discarded
(P)
(P)
<h>
<t>
Words Bit Setting contents
Boards
(CS Series Only)
Unit
(CS/CJ Series)
Port 1Port 2Port 1Port 2
CIO
1909
CIO
1919
n + 9 n + 19 15 Port
Operat-
ing
Status
Protocol Macro Executing Flag
14 Step Error Processing Flag
13 Abort Flag
12 Tracing Flag
11 Sequence End Completion Flag
10 Sequence Abort Completion Flag
09 Sequence Wait Flag
08 Serial Gateway Prohibited Flag (protocol macros)
1: Prohibited; 0: Not prohibited
04 to 07 Reserved
03 to 00 Error codes
CIO
1910
CIO
1920
n + 10 n + 20 15 to 12 Reserved
11 to 00 Communications Sequence No.
000 to 999 (000 to 3E7 hex)
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