Chapter 6 computer interface, 4 protocol – INFICON SID-242 Thin Film Deposition Controller User Manual
Page 84
Chapter 6 Computer Interface
6-3
6.4 Protocol
The SQS-242 program never initiates communications. It only responds to commands
from the host computer.
SQS-242 computer Interface commands fall into two general categories. Query
commands request data from the SQS-242 program. Update commands instruct the
SQS-242 program to take an action. The SQS-242 responds to both Query and Update
commands with a response that indicates the results of the command request.
Query Command:
@<command>;<param1>;…;<paramn>;<Chksum><CR>
Query Example: Software Version Query
@QU;11;44<CR>
Description:
@
Message start character
;
Separator
QU
Query Utility command
;
Separator
11
Parameter 11 (SID242 Software Version)
;
Separator
44
Checksum (see section that follows on checksums)
<CR>
Carriage Return (ASCII 13)
Response Example: Software Version Query
@QU;<ACQ>;2.1.6;??<CR> (Response
to
Software Version query)
Description:
@;QU;<ACQ>;
Query Acknowledged (ASCII 06)
2.1.6
Message (Software Version)
;
Separator
0C
Checksum (actual checksum varies with different versions)
<CR>
Carriage Return (ASCII 13)