Texas Instruments 990 User Manual page 115

Applications Programming
Code
Meaning
00 Read operation has been successfully
completed by the communications
package.
01 Not used.
02 Not used.
03 Invalid SID specified.
04 No input data has been received for
the program to read.
05 Not used.
06 The communications package is not
active.
07 Not used.
08 Invalid DID specified.
09 Buffer length specified is too small
to read input data.
OA Not used.
OB Not used.
4.6.2.2 WRIT4D Subroutine Call.
Subroutine WRIT4D builds an SVC block and executes an SVC with
I/O opcode 2. A call to this subroutine causes one block of data
in the calling program to be transferred from the
program~s
data
buffer to a communications output buffer for subsequent
tr a nsmis s ion to a DID in ano th e r s ta t ion. Con tr
01
is re tu rned to
the calling program immediately upon completion of the data being
transferred to the communications output buffer.
No provisions are made for automatic response from the DID.
Applications programs can establish their own methods for
validating data sent and/or received (for example, DID can send a
message back to the SID to validate data received).
The syntax for the call statement is as follows:
FORTRAN:
CALL WRIT4D «buffe,r>, <char cnt>, <did>, <s id>, <st code»
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