9132 Portable IR Calibrator
User’s Guide
26
7.2.1.1 Baud Rate
The baud rate is the first parameter in the menu. The display prompts with the baud rate pa-
rameter by showing “
bAUd
”. Press “SET” to choose to set the baud rate. The current baud rate
value is displayed. The baud rate may be programmed to 300, 600, 1200, 2400, 4800, or 9600
baud. The baud rate is pre-programmed to 1200 baud. Use “UP” or “DOWN” to change the
baud rate value. Press “SET” to set the baud rate to the new value or “EXIT” to abort the opera-
tion and skip to the next parameter in the menu.
7.2.1.2 Sample Period
The sample period is the next parameter in the menu and prompted with
SPER
. The sample
period is the time period in seconds between temperature measurements transmitted from the
serial interface. If the sample rate is set to 5, the instrument transmits the current measurement
over the serial interface approximately every five seconds. The automatic sampling is disabled
with a sample period of 0. Press “SET” to choose to set the sample period. Adjust the period
with “UP” or “DOWN” and then use “SET” to set the sample rate to the displayed value.
7.2.1.3 Duplex Mode
The next parameter is the duplex mode indicated with
DUPL
. The duplex mode may be set to
half duplex (
HALF
) or full duplex (
FULL
). With full duplex any commands received by the
thermometer via the serial interface are immediately echoed or transmitted back to the device of
origin. With half duplex the commands are executed but not echoed. The default setting is full
duplex. The mode may be changed using “UP” or “DOWN” and pressing “SET”.
7.2.1.4 Linefeed
The final parameter in the serial interface menu is the linefeed mode. This parameter enables
(
ON
) or disables (
OFF
) transmission of a linefeed character (LF, ASCII10) after transmission
of any carriage-return. The default setting is with linefeed on. The mode may be changed using
“UP” or “DOWN” and pressing “SET”.
7.2.2 Serial Operation
Once the cable has been attached and the interface set up properly the controller immediately
begins transmitting temperature readings at the programmed rate. The serial communications
uses 8 data bits, one stop bit, and no parity. The set-point and other commands may be sent via
the serial interface to set the temperature set-point and view or program the various parameters.
The interface commands are discussed in Section . All commands are ASCII character strings
terminated with a carriage-return character (CR, ASCII 13).
7.3
Interface Commands
The various commands for accessing the calibrator functions via the digital interfaces are listed
in this section (see Table 3). These commands are used with the RS-232 serial interface. The
commands are terminated with a carriage-return character. The interface makes no distinction
between upper and lower case letters, hence either may be used. Commands may be abbrevi-
ated to the minimum number of letters, which determines a unique command. A command may
be used to either set a parameter or display a parameter depending on whether or not a value
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