ProSoft Technology MVI56-BAS - Manual (Page 43)

MVI56-BAS ♦ ControlLogix Platform Backplane Data Transfer
BASIC Module (DB/BAS Compatible) User Manual
ProSoft Technology, Inc. Page 43 of 234
December 13, 2011
4.2 Data Transfer from CLX Processor to MVI Input Buffer
The following BASIC CALLs 14, 15, 53 and 56 are covered in this section. Refer
to BASIC CALLs Syntax (page 105) for detailed syntax information about these
CALLs.
The MVI56-BAS input buffer can receive data transferred from the CLX
processor through the backplane using CALLs 56 or 53. The input buffer data
can be read using CALLs 14 and 15.
The data transfer from the CLX to the MVI56-BAS input buffer is shown in the
following diagram:
The input buffer is divided into areas depending on the source of the data
transferred. The input buffer addressing is shown in the following table.
Address Definition
0 to 39 DH-485 Common Interface File - data written by other devices
40 to 99 Reserved
100 to 199 Data transferred from the CLX using Message instruction
200 to 231 Data transferred from the CLX Output Image file
CALL 53 transfers 8 words from the CLX output image file to the MVI56-BAS
input buffer.
The following example BASIC code uses CALL 53 to transfer data from the CLX
output image file to the input buffer. After that, it uses CALL 14 to read the data
from the MVI56-BAS input buffer and prints it to PRT1.
10 CALL 53
20 POP X: REM CALL 53 status code
30 FOR I = 200 TO 207