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9150
User's Guide
9.1.1
Wiring
The serial communications cable attaches to the calibrator through the DB-9
connector at the back of the instrument. Figure 5 shows the pin-out of this
connector and suggested cable wiring. The serial cable should be shielded. If the
unit is used in a heavy industrial setting, the serial cable must be limited to ONE
meter.
9.1.2
Setup
Before operation the serial interface must first be set up by programming the
BAUD rate and other configuration parameters. These parameters are
programmed within the serial interface menu. The serial interface parameters
menu is out- lined in Figure 4 on page 22.
To enter the serial parameter programming mode first press "EXIT" while
pressing "SET" and release to enter the secondary menu. Press "SET"
repeatedly until the display reads "". Press "UP" until the serial interface menu
is indicated with "". Finally press "SET" to enter the serial parameter menu.
In the serial interface parameters menu are the BAUD rate, the sample rate, the
duplex mode, and the linefeed parameter.
9.1.2.1 BAUD Rate
The BAUD rate is the first parameter in the menu. The display prompts with the
BAUD rate parameter by showing "bAUd". Press "SET" to choose to set the
BAUD rate. The current BAUD rate value is displayed. The BAUD rate of the
9150 serial communications may be programmed to 300, 600, 1200, 2400, 4800,
or 9600 baud. The BAUD rate is preprogrammed to 2400 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 operation and skip to the next parameter in
the menu.
9.1.2.2 Sample Period
The sample period is the next parameter in the menu and prompted with "".
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.
9.1.2.3 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".
9.1.2.4 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, ASCII 10) 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".
9-2
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