INFICON SID-242 Thin Film Deposition Controller - 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:
@;;…;;
Query Example: Software Version Query
@QU;11;44
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)
Carriage Return (ASCII 13)
Response Example: Software Version Query
@QU;;2.1.6;?? (Response
to
Software Version query)
Description:
@;QU;; Query Acknowledged (ASCII 06)
2.1.6 Message (Software Version)
; Separator
0C Checksum (actual checksum varies with different versions)
Carriage Return (ASCII 13)