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Digital Communication Interface
10.1 Serial Communications10
10-3
10.1.2.1 Baud Rate
The baud rate is the first parameter in the menu. The display will prompt with the
baud rate parameter by showing “bAUd”. Press “SET” to choose to set the baud
rate. The current baud rate value will then be displayed. The baud rate of the
7102 serial communications 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 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.
10.1.2.2 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.
10.1.2.3 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 will be
immediately echoed or transmitted back to the device of origin. With half duplex
the commands will be executed but not echoed. The default setting is full duplex.
The mode may be changed using “UP” or “DOWN” and pressing “SET”.
10.1.2.4 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, 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”.
10.1.3 Serial Operation
Once the cable has been attached and the interface set up properly the controller
will immediately begin 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 10.2. All commands are ASCII character
strings terminated with a carriage- return character (CR, ASCII 13).
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