Intek RheoVac 950A - Manual (Page 20)

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3. Public Forum
Registration is not required for viewing access to the public forum. This forum is a
way to freely exchange ideas and post questions (with registration) to professionals
within the power industry.
4. Private Forum
Through the private forum, the registrant will be able to communicate directly with
Intek engineers regarding data analysis, condenser services, instrumentation, and
other questions. Posts on this forum will only be visible by the user and Intek
engineers.
5. Continuous Condenser Monitoring and Performance Analysis
Intek offers services where Intek will continually monitor the user’s condenser(s) and
provide feedback, action items, and selected performance reports. More information
regarding Intek’s condenser services is available upon request.
3.6 CUSTOM SOFTWARE
Custom software may be developed by the user to receive and archive RheoVac data into a
computer system. The electronics has a serial data protocol of 9600 baud, no parity check, eight
data bits and one stop bit (i.e., 9600,N,8,1). Each transmitted group of data is sent in a standard
ASCII coded format representing each process variable value, instrument identification and
status information.
The data stream consists of 13 fields, followed by a carriage return <RETURN>. The first ten
fields, nine bytes each, are the process variables. Following the process variables are the
RheoVac serial number, nine bytes; the process identification tag number, 15 bytes; and the
RheoVac system status, seven bytes. The data stream is then ended by a single <RETURN> byte
(ASCII code 13). The total number of bytes transmitted in each data stream is 122 bytes per
probe including the trailing <RETURN>. This data group is sent approximately once every three
seconds. Table V shows the field names and number of bytes in one data stream.
Table 5 Serial Output Data Stream*
Actual
Volume
Flow
(ACFM)
Total
Mass
Flow
(lbs/hr)
Water
Vapor
Flow
(lbs/hr)
RheoVac
Pressure
("Hg abs)
Water
Vapor
Sp. Vol.
(ft 3 /lb)
Water to
Air Mass
Ratio
(lb/lb)
Relative
Satura-
tion (%)
H
2
O
Partial
Pressure
("Hg abs)
Air
Flow
In-Leak
(SCFM)
Probe
Temp.
(°F)
Instr.
Serial
Number
ID Tag
No.
Status
Term.
<CR>
9
bytes
9
bytes
9
bytes
9
bytes
9
bytes
9
bytes
9
bytes
9
bytes
9
bytes
9
bytes
9
bytes
15
bytes
7
bytes
1
byte
* See Custom Information section (Section 6) for custom units of measure.
Each of the first ten process values are sent in the fixed decimal format of XXXX.XXXX with
leading and trailing zeros inserted to maintain the nine character length. The next three fields are
ASCII text strings followed by the <RETURN>. Example: The nine bytes for an air in-leak of
10.0 SCFM would be: 0010.0000, or 48,48,49,48,46,48,48,48,48 ASCII.