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8.2.2 Data Configuration
The computer must be set to match the fixed data
configuration of the analyzer, which is:
8.2.3 RS232C Function Commands
The RS232C interface can be used as follows:
• By direct hookup to a nonMacIntosh® based
computer A program on disc can be obtained from
Rosemount Analytical for remote control. Cable
length must less than 150 feet.
• By direct hookup to a nonintelligent terminal. No
program disc is required. Cable length must be less
than 150 feet.
• By communication through a modem. One modem
located at the analyzer can communicate over a
telephone network to another modem hooked up to
an IBM PC or compatible computer or a nonintelli
gent terminal.
Pin configuration is described in Table 84.
Table 84: RS232C Pin Configuration
8.2 Computer Interface
The computer interface is an RS232C serial data
interchange port operating at 1200 baud. The serial port
receives the same information as the printer, and has the
capability to transmit information, enabling remote
control of the analyzer.
8.2.1 Data Output Format
The data output formats contain no control characters,
with the exception of <CR> carriage return, <LF> line
feed, and the preamble/post amble described below:
Table 82: Normal Data Output Format
48
CFA3000 MANUAL SECTION 8
ADDIDIONAL FEATURES
Data Format
Preamble NUL, STX, NUL =
(00, 02, 00 Hex notation)
Date/Time ASCII string of 25
characters, followed by
7 spaces
Concentration ASCII string of 5
characters, followed by
9 spaces
Stream Number One ASCII character
Mode An ASCII string,
consisting of 7 spaces,
followed by three
possible messages:
NOT calibrated, Manual,
or Automatic.
Calibration Status There are two ASCII
messages transmitted:
CAL when calibration is
in progress, and blank
when good data is
available.
Postamble: NUL, EOT,
NUL = (00, 04, 00
Hex notation)
Postamble NUL, EOT, NUL =
(00,04,00 Hex notation)
Pin No.
Circuit
EIA
Circuit
CCITT
Direction of
Signal
Description
1 AA 101
Protective
Ground
*2 BA 103
From
Terminal
Transmitted
Data
*3 BB 104 To Terminal
Received
Data
*4 CA 105
From
Terminal
Request to
Send
*5 CB 106 To Terminal Clear to Send
Parameter. Setting
Baud Rate 1200
Data
8 bits, high order bit set to
zero
Parity None
Stop Bits 1