Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 174)

Model 9110TH NOx Analyzer Operating Instructions
Teledyne Analytical Instruments 154
possible messages, and this section for information on controlling the instrument
through the RS-232 interface.
GENERAL MESSAGE FORMAT
All messages from the instrument (including those in response to a command line
request) are in the format:
X DDD:HH:MM [Id] MESSAGE<CRLF>
Where
X is a command type designator, a single character indicating the message
type, as shown in the Table 6-31.
DDD:HH:MM is the time stamp, the date and time when the message was issued. It
consists of the Day-of-year (DDD) as a number from 1 to 366, the hour of
the day (HH) as a number from 00 to 23, and the minute (MM) as a
number from 00 to 59.
[ID] is the analyzer ID, a number with 1 to 4 digits.
MESSAGE is the message content that may contain warning messages, test
measurements, DAS reports, variable values, etc.
<CRLF> is a carriage return / line feed pair, which terminates the message.
The uniform nature of the output messages makes it easy for a host computer to parse
them into an easy structure. Keep in mind that the front panel display does not give any
information on the time a message was issued, hence it is useful to log such messages
for trouble-shooting and reference purposes. Terminal emulation programs such as
HyperTerminal can capture these messages to text files for later review.
4.15.2.6. Remote Access by Modem
The 9110TH/M can be connected to a modem for remote access. This requires a cable
between the analyzer’s COM port and the modem, typically a DB-9F to DB-25M cable
(available from TAI with part number WR0000024).
Once the cable has been connected, check to make sure the DTE-DCE is in the correct
position. Also make sure the 9110TH/M COM port is set for a baud rate that is
compatible with the modem, which needs to operate with an 8-bit word length with one
stop bit.
The first step is to turn on the MODEM ENABLE communication mode (Mode 64).
Once this is completed, the appropriate setup command line for your modem can be
entered into the analyzer. The default setting for this feature is
AT Y0 &D0 &H0 &I0 S0=2 &B0 &N6 &M0 E0 Q1 &W0
This string can be altered to match your modem’s initialization and can be up to 100
characters long.
Note If Hessen Protocol Mode is active for a com port, operation via a modem
is not available on that port.