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down “SET”, then release both buttons to enter the secondary menu. Press
“SET” repeatedly until the display reads “PAr”. Press “UP” once, the serial in
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terface menu is indicated with “SErIAL”. Finally press “SET” to enter the se
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rial parameter menu. In the serial parameters menu are the baud rate, the
sample period, the duplex mode, and the linefeed parameter.
7.1.2.1 Baud Rate (Cold Side Only)
The baud rate is the first parameter in the menu and is indicated by “BAUd”.
Press “SET” to choose to set the baud rate. The current baud rate value is dis
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played. The serial communications baud rate may be programmed to 300, 600,
1200, 2400, 4800, or 9600 baud. The baud rate is pre-programmed to 2400
baud. Use “UP” or “DOWN” to change the baud rate setting. Press “SET” to
accept the new setting or “EXIT” to abort the operation and skip to the next pa
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rameter in the menu.
7.1.2.2 Sample Period
The sample period is the next parameter in the menu and is indicated by
“SPEr”. The sample period is the time period in seconds between temperature
measurements transmitted from the serial interface. If the sample period 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”. Press “SET” to save the new sample rate to the
displayed value or “EXIT” to abort the operation and skip to the next parameter
in the menu.
7.1.2.3 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 controller via the serial interface are immedi
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ately executed and 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”. Press “SET” to
accept the new setting or “EXIT” to abort the operation and skip to the next pa
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rameter in the menu.
7.1.2.4 Linefeed
The final parameter in the menu is the linefeed mode and is indicated by “LF”.
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”. Press “SET” to accept the new setting or “EXIT” to abort the opera
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tion and return to the beginning of the serial interface menu.
9011 Dual-Well Calibrator
User’s Guide
38