Veeco MS40 Operation And Maintenance Manual page 139

Remote Port Specification
For VIC MS-40 Series Leak Detectors
(Ninth Revision 1-20-97)
WARNING:
This information should only be used by experienced and
knowledgeable personnel!
Full PC Remote Control Specification
Using the following specification, software can be written to enable a remote
computer to completely control the MS-40 Leak Detector. The remote
computer can control every function of the leak detector except for service
functions. Service Mode cannot be entered by the remote computer.
Pressures, valve status, current state, and other operating parameters can all be
monitored over this communications link. All data is transmitted serially and
each byte consists of one ASCII character. Each packet of information begins
with an ASCII character between the letter 'A' and the letter 'g'. Certain
packets contain a fixed number of bytes and some have a dynamically varying
length. MS-40 Software revisions 3.8 and later made the fields fixed in length
any only used numbers. The description of each packet will clarify this point.
Every packet, minus its initial letter, is made up of the ASCII numbers '0'
through '9', the period, and the lowercase 'x'. The beginning of each packet
dictates the end of the previous packet (unless terminated as discussed below).
'A' - Followed by a '1'.
'B' - Not used in the MS-40 at this time.
'C' - Followed by 4 or 5 characters.
Vacuum Instrument Corp.
2099 Ninth Avenue
Ronkonkoma, NY 11779
631.737.0900
1109-186-00 Rev. C
'1' - indicates that an invalid command was sent by the remote PC. It
could mean that the format of the command was incorrect, or an
attempt was made to change a parameter to an invalid value.
Leak Rate Value measured in atm-cc/sec or mbar-l/sec. The format is
such that it matches that of the MS-30 series leak detectors.
(e.g. 2300 = 2.3 x 10-0 atm-cc/sec)
(e.g. 5708 = 5.7 x 10-8 atm-cc/sec)
(e.g. 10010 =10-0 x 10-10 atm-cc/sec)
In software revisions 3.8 and later, this field is fixed at 6 characters.
d-i